Switch to SLF4J logging.

config/checkstyle/import-control.xml

@@ -15,6 +15,7 @@
   <allow pkg="com.google.gson"/>
   <allow pkg="net.royawesome.jlibnoise"/>
   <allow pkg="org.json.simple" />
+  <allow pkg="org.slf4j"/>
 
   <subpackage name="util.yaml">
     <allow pkg="org.yaml.snakeyaml"/>

worldedit-bukkit/build.gradle

@@ -14,6 +14,7 @@ dependencies {
     compile 'org.bukkit:bukkit:1.13.2-R0.1-SNAPSHOT' // zzz
     compile 'org.bstats:bstats-bukkit:1.4'
     compile "io.papermc:paperlib:1.0.1"
+    compile 'org.slf4j:slf4j-jdk14:1.7.26'
     testCompile 'org.mockito:mockito-core:1.9.0-rc1'
 }
 

worldedit-bukkit/src/main/java/com/sk89q/wepif/FlatFilePermissionsResolver.java

@@ -22,6 +22,8 @@ package com.sk89q.wepif;
 import com.sk89q.util.yaml.YAMLProcessor;
 import org.bukkit.OfflinePlayer;
 import org.bukkit.Server;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.BufferedReader;
 import java.io.File;
@@ -32,12 +34,10 @@ import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 public class FlatFilePermissionsResolver implements PermissionsResolver {
 
-    private static final Logger log = Logger.getLogger(FlatFilePermissionsResolver.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(FlatFilePermissionsResolver.class);
 
     private Map<String, Set<String>> userPermissionsCache;
     private Set<String> defaultPermissionsCache;
@@ -98,7 +98,7 @@ public class FlatFilePermissionsResolver implements PermissionsResolver {
                 }
             }
         } catch (IOException e) {
-            log.log(Level.WARNING, "Failed to load permissions", e);
+            log.warn("Failed to load permissions", e);
         } finally {
             try {
                 if (buff != null) {
@@ -164,7 +164,7 @@ public class FlatFilePermissionsResolver implements PermissionsResolver {
                 }
             }
         } catch (IOException e) {
-            log.log(Level.WARNING, "Failed to load permissions", e);
+            log.warn("Failed to load permissions", e);
         } finally {
             try {
                 if (buff != null) {

worldedit-bukkit/src/main/java/com/sk89q/wepif/NijiPermissionsResolver.java

@@ -28,13 +28,12 @@ import org.bukkit.command.PluginCommand;
 import org.bukkit.entity.Player;
 import org.bukkit.plugin.Plugin;
 import org.bukkit.plugin.PluginManager;
-
+import org.slf4j.Logger;
-import java.util.logging.Level;
+import org.slf4j.LoggerFactory;
-import java.util.logging.Logger;
 
 public class NijiPermissionsResolver implements PermissionsResolver {
 
-    private static final Logger log = Logger.getLogger(NijiPermissionsResolver.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(NijiPermissionsResolver.class);
 
     private Server server;
     private Permissions api;
@@ -84,7 +83,7 @@ public class NijiPermissionsResolver implements PermissionsResolver {
                 return api.Security.permission(player, permission);
             }
         } catch (Throwable t) {
-            log.log(Level.WARNING, "Failed to check permissions", t);
+            log.warn("Failed to check permissions", t);
             return false;
         }
     }
@@ -98,7 +97,7 @@ public class NijiPermissionsResolver implements PermissionsResolver {
                 return api.getHandler().has(server.getPlayerExact(name), permission);
             }
         } catch (Throwable t) {
-            log.log(Level.WARNING, "Failed to check permissions", t);
+            log.warn("Failed to check permissions", t);
             return false;
         }
     }
@@ -115,7 +114,7 @@ public class NijiPermissionsResolver implements PermissionsResolver {
                 return api.Security.inGroup(name, group);
             }
         } catch (Throwable t) {
-            log.log(Level.WARNING, "Failed to check groups", t);
+            log.warn("Failed to check groups", t);
             return false;
         }
     }
@@ -139,7 +138,7 @@ public class NijiPermissionsResolver implements PermissionsResolver {
                 return groups;
             }
         } catch (Throwable t) {
-            log.log(Level.WARNING, "Failed to get groups", t);
+            log.warn("Failed to get groups", t);
             return new String[0];
         }
     }

worldedit-bukkit/src/main/java/com/sk89q/wepif/PermissionsResolverManager.java

@@ -27,6 +27,8 @@ import org.bukkit.event.EventHandler;
 import org.bukkit.event.server.PluginDisableEvent;
 import org.bukkit.event.server.PluginEnableEvent;
 import org.bukkit.plugin.Plugin;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.File;
 import java.io.IOException;
@@ -35,8 +37,6 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Iterator;
 import java.util.List;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 public class PermissionsResolverManager implements PermissionsResolver {
 
@@ -85,7 +85,7 @@ public class PermissionsResolverManager implements PermissionsResolver {
     private Server server;
     private PermissionsResolver permissionResolver;
     private YAMLProcessor config;
-    private Logger logger = Logger.getLogger(getClass().getCanonicalName());
+    private Logger logger = LoggerFactory.getLogger(getClass());
     private List<Class<? extends PermissionsResolver>> enabledResolvers = new ArrayList<>();
 
     @SuppressWarnings("unchecked")
@@ -119,7 +119,7 @@ public class PermissionsResolverManager implements PermissionsResolver {
                     break;
                 }
             } catch (Throwable e) {
-                logger.log(Level.WARNING, "Error in factory method for " + resolverClass.getSimpleName(), e);
+                logger.warn("Error in factory method for " + resolverClass.getSimpleName(), e);
                 continue;
             }
         }
@@ -195,14 +195,14 @@ public class PermissionsResolverManager implements PermissionsResolver {
             try {
                 file.createNewFile();
             } catch (IOException e) {
-                logger.log(Level.WARNING, "Failed to create new configuration file", e);
+                logger.warn("Failed to create new configuration file", e);
             }
         }
         config = new YAMLProcessor(file, false, YAMLFormat.EXTENDED);
         try {
             config.load();
         } catch (IOException e) {
-            logger.log(Level.WARNING, "Error loading WEPIF configuration", e);
+            logger.warn("Error loading WEPIF configuration", e);
         }
         List<String> keys = config.getKeys(null);
         config.setHeader(CONFIG_HEADER);
@@ -232,7 +232,7 @@ public class PermissionsResolverManager implements PermissionsResolver {
                 } catch (ClassNotFoundException e) {}
 
                 if (next == null || !PermissionsResolver.class.isAssignableFrom(next)) {
-                    logger.warning("WEPIF: Invalid or unknown class found in enabled resolvers: "
+                    logger.warn("WEPIF: Invalid or unknown class found in enabled resolvers: "
                             + nextName + ". Moving to disabled resolvers list.");
                     i.remove();
                     disabledResolvers.add(nextName);

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/BukkitCommandInspector.java

@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.bukkit;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.sk89q.bukkit.util.CommandInspector;
 import com.sk89q.minecraft.util.commands.CommandLocals;
 import com.sk89q.worldedit.extension.platform.Actor;
@@ -29,12 +27,14 @@ import com.sk89q.worldedit.util.command.Description;
 import com.sk89q.worldedit.util.command.Dispatcher;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
-import java.util.logging.Logger;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 class BukkitCommandInspector implements CommandInspector {
 
-    private static final Logger logger = Logger.getLogger(BukkitCommandInspector.class.getCanonicalName());
+    private static final Logger logger = LoggerFactory.getLogger(BukkitCommandInspector.class);
     private final WorldEditPlugin plugin;
     private final Dispatcher dispatcher;
 
@@ -51,7 +51,7 @@ class BukkitCommandInspector implements CommandInspector {
         if (mapping != null) {
             return mapping.getDescription().getDescription();
         } else {
-            logger.warning("BukkitCommandInspector doesn't know how about the command '" + command + "'");
+            logger.warn("BukkitCommandInspector doesn't know how about the command '" + command + "'");
             return "Help text not available";
         }
     }
@@ -63,7 +63,7 @@ class BukkitCommandInspector implements CommandInspector {
             Description description = mapping.getDescription();
             return "Usage: " + description.getUsage() + (description.getHelp() != null ? "\n" + description.getHelp() : "");
         } else {
-            logger.warning("BukkitCommandInspector doesn't know how about the command '" + command + "'");
+            logger.warn("BukkitCommandInspector doesn't know how about the command '" + command + "'");
             return "Help text not available";
         }
     }
@@ -76,7 +76,7 @@ class BukkitCommandInspector implements CommandInspector {
             locals.put(Actor.class, plugin.wrapCommandSender(sender));
             return mapping.getCallable().testPermission(locals);
         } else {
-            logger.warning("BukkitCommandInspector doesn't know how about the command '" + command + "'");
+            logger.warn("BukkitCommandInspector doesn't know how about the command '" + command + "'");
             return false;
         }
     }

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/BukkitConfiguration.java

@@ -22,6 +22,7 @@ package com.sk89q.worldedit.bukkit;
 import com.sk89q.util.yaml.YAMLProcessor;
 import com.sk89q.worldedit.util.YAMLConfiguration;
 import com.sk89q.worldedit.util.report.Unreported;
+import org.slf4j.LoggerFactory;
 
 import java.io.File;
 
@@ -34,7 +35,7 @@ public class BukkitConfiguration extends YAMLConfiguration {
     @Unreported private final WorldEditPlugin plugin;
 
     public BukkitConfiguration(YAMLProcessor config, WorldEditPlugin plugin) {
-        super(config, plugin.getLogger());
+        super(config, LoggerFactory.getLogger(plugin.getLogger().getName()));
         this.plugin = plugin;
     }
 

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java

@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.bukkit;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.sk89q.worldedit.EditSession;
 import com.sk89q.worldedit.WorldEdit;
 import com.sk89q.worldedit.WorldEditException;
@@ -48,17 +46,17 @@ import org.bukkit.block.Chest;
 import org.bukkit.entity.Entity;
 import org.bukkit.inventory.DoubleChestInventory;
 import org.bukkit.inventory.Inventory;
+import org.slf4j.Logger;
 
+import javax.annotation.Nullable;
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
 import java.util.EnumMap;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
-import javax.annotation.Nullable;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 public class BukkitWorld extends AbstractWorld {
 
@@ -118,9 +116,9 @@ public class BukkitWorld extends AbstractWorld {
                     return null;
                 }
             } catch (Exception e) {
-                logger.warning("Corrupt entity found when creating: " + entity.getType().getId());
+                logger.warn("Corrupt entity found when creating: " + entity.getType().getId());
                 if (entity.getNbtData() != null) {
-                    logger.warning(entity.getNbtData().toString());
+                    logger.warn(entity.getNbtData().toString());
                 }
                 e.printStackTrace();
                 return null;
@@ -183,7 +181,7 @@ public class BukkitWorld extends AbstractWorld {
             try {
                 getWorld().regenerateChunk(chunk.getBlockX(), chunk.getBlockZ());
             } catch (Throwable t) {
-                logger.log(Level.WARNING, "Chunk generation via Bukkit raised an error", t);
+                logger.warn("Chunk generation via Bukkit raised an error", t);
             }
 
             // Then restore
@@ -280,7 +278,7 @@ public class BukkitWorld extends AbstractWorld {
         treeTypeMapping.put(TreeGenerator.TreeType.RANDOM_MUSHROOM, TreeType.BROWN_MUSHROOM);
         for (TreeGenerator.TreeType type : TreeGenerator.TreeType.values()) {
             if (treeTypeMapping.get(type) == null) {
-                WorldEdit.logger.severe("No TreeType mapping for TreeGenerator.TreeType." + type);
+                WorldEdit.logger.error("No TreeType mapping for TreeGenerator.TreeType." + type);
             }
         }
     }
@@ -426,8 +424,8 @@ public class BukkitWorld extends AbstractWorld {
                 return adapter.setBlock(BukkitAdapter.adapt(getWorld(), position), block, notifyAndLight);
             } catch (Exception e) {
                 if (block instanceof BaseBlock && ((BaseBlock) block).getNbtData() != null) {
-                    logger.warning("Tried to set a corrupt tile entity at " + position.toString());
+                    logger.warn("Tried to set a corrupt tile entity at " + position.toString());
-                    logger.warning(((BaseBlock) block).getNbtData().toString());
+                    logger.warn(((BaseBlock) block).getNbtData().toString());
                 }
                 e.printStackTrace();
                 Block bukkitBlock = getWorld().getBlockAt(position.getBlockX(), position.getBlockY(), position.getBlockZ());

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/WorldEditPlugin.java

@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.bukkit;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.google.common.base.Joiner;
 import com.sk89q.util.yaml.YAMLProcessor;
 import com.sk89q.wepif.PermissionsResolverManager;
@@ -58,7 +56,10 @@ import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabCompleter;
 import org.bukkit.entity.Player;
 import org.bukkit.plugin.java.JavaPlugin;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
+import javax.annotation.Nullable;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
@@ -68,17 +69,16 @@ import java.util.List;
 import java.util.Map;
 import java.util.jar.JarFile;
 import java.util.logging.Level;
-import java.util.logging.Logger;
 import java.util.zip.ZipEntry;
 
-import javax.annotation.Nullable;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
  * Plugin for Bukkit.
  */
 public class WorldEditPlugin extends JavaPlugin implements TabCompleter {
 
-    private static final Logger log = Logger.getLogger(WorldEditPlugin.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(WorldEditPlugin.class);
     public static final String CUI_PLUGIN_CHANNEL = "worldedit:cui";
     private static WorldEditPlugin INSTANCE;
 
@@ -194,23 +194,23 @@ public class WorldEditPlugin extends JavaPlugin implements TabCompleter {
         try {
             adapterLoader.addFromPath(getClass().getClassLoader());
         } catch (IOException e) {
-            log.log(Level.WARNING, "Failed to search path for Bukkit adapters");
+            log.warn("Failed to search path for Bukkit adapters");
         }
 
         try {
             adapterLoader.addFromJar(getFile());
         } catch (IOException e) {
-            log.log(Level.WARNING, "Failed to search " + getFile() + " for Bukkit adapters", e);
+            log.warn("Failed to search " + getFile() + " for Bukkit adapters", e);
         }
         try {
             bukkitAdapter = adapterLoader.loadAdapter();
-            log.log(Level.INFO, "Using " + bukkitAdapter.getClass().getCanonicalName() + " as the Bukkit adapter");
+            log.info("Using " + bukkitAdapter.getClass().getCanonicalName() + " as the Bukkit adapter");
         } catch (AdapterLoadException e) {
             Platform platform = worldEdit.getPlatformManager().queryCapability(Capability.WORLD_EDITING);
             if (platform instanceof BukkitServerInterface) {
-                log.log(Level.WARNING, e.getMessage());
+                log.warn(e.getMessage());
             } else {
-                log.log(Level.INFO, "WorldEdit could not find a Bukkit adapter for this MC version, " +
+                log.info("WorldEdit could not find a Bukkit adapter for this MC version, " +
                         "but it seems that you have another implementation of WorldEdit installed (" + platform.getPlatformName() + ") " +
                         "that handles the world editing.");
             }

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/BukkitImplLoader.java

@@ -20,6 +20,8 @@
 package com.sk89q.worldedit.bukkit.adapter;
 
 import com.sk89q.worldedit.util.io.Closer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.File;
 import java.io.IOException;
@@ -29,15 +31,13 @@ import java.util.Enumeration;
 import java.util.List;
 import java.util.jar.JarEntry;
 import java.util.jar.JarFile;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 /**
  * Loads Bukkit implementation adapters.
  */
 public class BukkitImplLoader {
 
-    private static final Logger log = Logger.getLogger(BukkitImplLoader.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(BukkitImplLoader.class);
     private final List<String> adapterCandidates = new ArrayList<>();
     private String customCandidate;
 
@@ -73,7 +73,7 @@ public class BukkitImplLoader {
         if (className != null) {
             customCandidate = className;
             adapterCandidates.add(className);
-            log.log(Level.INFO, "-Dworldedit.bukkit.adapter used to add " + className + " to the list of available Bukkit adapters");
+            log.info("-Dworldedit.bukkit.adapter used to add " + className + " to the list of available Bukkit adapters");
         }
     }
 
@@ -157,18 +157,18 @@ public class BukkitImplLoader {
                 if (BukkitImplAdapter.class.isAssignableFrom(cls)) {
                     return (BukkitImplAdapter) cls.newInstance();
                 } else {
-                    log.log(Level.WARNING, "Failed to load the Bukkit adapter class '" + className +
+                    log.warn("Failed to load the Bukkit adapter class '" + className +
                             "' because it does not implement " + BukkitImplAdapter.class.getCanonicalName());
                 }
             } catch (ClassNotFoundException e) {
-                log.log(Level.WARNING, "Failed to load the Bukkit adapter class '" + className +
+                log.warn("Failed to load the Bukkit adapter class '" + className +
                         "' that is not supposed to be missing", e);
             } catch (IllegalAccessException e) {
-                log.log(Level.WARNING, "Failed to load the Bukkit adapter class '" + className +
+                log.warn("Failed to load the Bukkit adapter class '" + className +
                         "' that is not supposed to be raising this error", e);
             } catch (Throwable e) {
                 if (className.equals(customCandidate)) {
-                    log.log(Level.WARNING, "Failed to load the Bukkit adapter class '" + className + "'", e);
+                    log.warn("Failed to load the Bukkit adapter class '" + className + "'", e);
                 }
             }
         }

worldedit-core/build.gradle

@@ -12,6 +12,7 @@ dependencies {
     compile 'com.google.code.gson:gson:2.8.0'
     compile 'com.sk89q.lib:jlibnoise:1.0.0'
     compile 'com.googlecode.json-simple:json-simple:1.1.1'
+    compile 'org.slf4j:slf4j-api:1.7.26'
     //compile 'net.sf.trove4j:trove4j:3.0.3'
     testCompile 'org.mockito:mockito-core:1.9.0-rc1'
 }

worldedit-core/src/main/java/com/sk89q/minecraft/util/commands/CommandsManager.java

@@ -20,6 +20,8 @@
 package com.sk89q.minecraft.util.commands;
 
 import com.sk89q.util.StringUtil;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
@@ -30,8 +32,6 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 /**
  * Manager for handling commands. This allows you to easily process commands,
@@ -63,7 +63,7 @@ import java.util.logging.Logger;
 public abstract class CommandsManager<T> {
 
     protected static final Logger logger =
-            Logger.getLogger(CommandsManager.class.getCanonicalName());
+            LoggerFactory.getLogger(CommandsManager.class);
 
     /**
      * Mapping of commands (including aliases) with a description. Root
@@ -142,7 +142,7 @@ public abstract class CommandsManager<T> {
                 return registerMethods(cls, parent, obj);
             }
         } catch (InvocationTargetException | InstantiationException | IllegalAccessException e) {
-            logger.log(Level.SEVERE, "Failed to register commands", e);
+            logger.error("Failed to register commands", e);
         }
         return null;
     }
@@ -523,7 +523,7 @@ public abstract class CommandsManager<T> {
         try {
             method.invoke(instance, methodArgs);
         } catch (IllegalArgumentException | IllegalAccessException e) {
-            logger.log(Level.SEVERE, "Failed to execute command", e);
+            logger.error("Failed to execute command", e);
         } catch (InvocationTargetException e) {
             if (e.getCause() instanceof CommandException) {
                 throw (CommandException) e.getCause();

worldedit-core/src/main/java/com/sk89q/minecraft/util/commands/SimpleInjector.java

@@ -19,14 +19,15 @@
 
 package com.sk89q.minecraft.util.commands;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.lang.reflect.Constructor;
 import java.lang.reflect.InvocationTargetException;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 public class SimpleInjector implements Injector {
 
-    private static final Logger log = Logger.getLogger(SimpleInjector.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(SimpleInjector.class);
     private Object[] args;
     private Class<?>[] argClasses;
 
@@ -45,7 +46,7 @@ public class SimpleInjector implements Injector {
             ctr.setAccessible(true);
             return ctr.newInstance(args);
         } catch (NoSuchMethodException | IllegalAccessException | InstantiationException | InvocationTargetException e) {
-            log.log(Level.SEVERE, "Error initializing commands class " + clazz, e);
+            log.error("Error initializing commands class " + clazz, e);
             return null;
         }
     }

worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java

@@ -19,12 +19,6 @@
 
 package com.sk89q.worldedit;
 
-import static com.google.common.base.Preconditions.checkArgument;
-import static com.google.common.base.Preconditions.checkNotNull;
-import static com.sk89q.worldedit.regions.Regions.asFlatRegion;
-import static com.sk89q.worldedit.regions.Regions.maximumBlockY;
-import static com.sk89q.worldedit.regions.Regions.minimumBlockY;
-
 import com.sk89q.worldedit.entity.BaseEntity;
 import com.sk89q.worldedit.entity.Entity;
 import com.sk89q.worldedit.event.extent.EditSessionEvent;
@@ -117,7 +111,10 @@ import com.sk89q.worldedit.world.block.BlockStateHolder;
 import com.sk89q.worldedit.world.block.BlockType;
 import com.sk89q.worldedit.world.block.BlockTypes;
 import com.sk89q.worldedit.world.registry.LegacyMapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
+import javax.annotation.Nullable;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -126,10 +123,12 @@ import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
-import javax.annotation.Nullable;
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.sk89q.worldedit.regions.Regions.asFlatRegion;
+import static com.sk89q.worldedit.regions.Regions.maximumBlockY;
+import static com.sk89q.worldedit.regions.Regions.minimumBlockY;
 
 /**
  * An {@link Extent} that handles history, {@link BlockBag}s, change limits,
@@ -142,7 +141,7 @@ import javax.annotation.Nullable;
 @SuppressWarnings({"FieldCanBeLocal"})
 public class EditSession implements Extent, AutoCloseable {
 
-    private static final Logger log = Logger.getLogger(EditSession.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(EditSession.class);
 
     /**
      * Used by {@link EditSession#setBlock(BlockVector3, BlockStateHolder, Stage)} to
@@ -1958,7 +1957,7 @@ public class EditSession implements Extent, AutoCloseable {
                     timedOut[0] = timedOut[0] + 1;
                     return null;
                 } catch (Exception e) {
-                    log.log(Level.WARNING, "Failed to create shape", e);
+                    log.warn("Failed to create shape", e);
                     return null;
                 }
             }
@@ -2322,7 +2321,7 @@ public class EditSession implements Extent, AutoCloseable {
                     timedOut[0] = timedOut[0] + 1;
                     return null;
                 } catch (Exception e) {
-                    log.log(Level.WARNING, "Failed to create shape", e);
+                    log.warn("Failed to create shape", e);
                     return null;
                 }
             }

worldedit-core/src/main/java/com/sk89q/worldedit/LocalSession.java

@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.sk89q.jchronic.Chronic;
 import com.sk89q.jchronic.Options;
 import com.sk89q.jchronic.utils.Span;
@@ -53,6 +51,7 @@ import com.sk89q.worldedit.world.item.ItemType;
 import com.sk89q.worldedit.world.item.ItemTypes;
 import com.sk89q.worldedit.world.snapshot.Snapshot;
 
+import javax.annotation.Nullable;
 import java.util.Calendar;
 import java.util.HashMap;
 import java.util.LinkedList;
@@ -60,7 +59,7 @@ import java.util.Map;
 import java.util.TimeZone;
 import java.util.concurrent.atomic.AtomicBoolean;
 
-import javax.annotation.Nullable;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
  * Stores session information.
@@ -798,7 +797,7 @@ public class LocalSession {
             try {
                 setCUIVersion(Integer.parseInt(split[1]));
             } catch (NumberFormatException e) {
-                WorldEdit.logger.warning("Error while reading CUI init message: " + e.getMessage());
+                WorldEdit.logger.warn("Error while reading CUI init message: " + e.getMessage());
                 this.failedCuiAttempts ++;
             }
         }

worldedit-core/src/main/java/com/sk89q/worldedit/TracedEditSession.java

@@ -24,8 +24,6 @@ import com.sk89q.worldedit.extent.inventory.BlockBag;
 import com.sk89q.worldedit.util.eventbus.EventBus;
 import com.sk89q.worldedit.world.World;
 
-import java.util.logging.Level;
-
 public class TracedEditSession extends EditSession {
 
     TracedEditSession(EventBus eventBus, World world, int maxBlocks, BlockBag blockBag, EditSessionEvent event) {
@@ -39,9 +37,9 @@ public class TracedEditSession extends EditSession {
         super.finalize();
 
         if (commitRequired()) {
-            WorldEdit.logger.warning("####### LEFTOVER BUFFER BLOCKS DETECTED #######");
+            WorldEdit.logger.warn("####### LEFTOVER BUFFER BLOCKS DETECTED #######");
-            WorldEdit.logger.warning("This means that some code did not flush their EditSession.");
+            WorldEdit.logger.warn("This means that some code did not flush their EditSession.");
-            WorldEdit.logger.log(Level.WARNING, "Here is a stacktrace from the creation of this EditSession:", stacktrace);
+            WorldEdit.logger.warn("Here is a stacktrace from the creation of this EditSession:", stacktrace);
         }
     }
 }

worldedit-core/src/main/java/com/sk89q/worldedit/WorldEdit.java

@@ -19,9 +19,6 @@
 
 package com.sk89q.worldedit;
 
-import static com.sk89q.worldedit.event.platform.Interaction.HIT;
-import static com.sk89q.worldedit.event.platform.Interaction.OPEN;
-
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Lists;
 import com.sk89q.worldedit.blocks.BaseItem;
@@ -53,7 +50,6 @@ import com.sk89q.worldedit.util.io.file.FileSelectionAbortedException;
 import com.sk89q.worldedit.util.io.file.FilenameException;
 import com.sk89q.worldedit.util.io.file.FilenameResolutionException;
 import com.sk89q.worldedit.util.io.file.InvalidFilenameException;
-import com.sk89q.worldedit.util.logging.WorldEditPrefixHandler;
 import com.sk89q.worldedit.util.task.SimpleSupervisor;
 import com.sk89q.worldedit.util.task.Supervisor;
 import com.sk89q.worldedit.world.block.BlockStateHolder;
@@ -61,7 +57,11 @@ import com.sk89q.worldedit.world.block.BlockType;
 import com.sk89q.worldedit.world.registry.BundledBlockData;
 import com.sk89q.worldedit.world.registry.BundledItemData;
 import com.sk89q.worldedit.world.registry.LegacyMapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
+import javax.annotation.Nullable;
+import javax.script.ScriptException;
 import java.io.DataInputStream;
 import java.io.File;
 import java.io.FileInputStream;
@@ -74,11 +74,9 @@ import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
-import javax.annotation.Nullable;
+import static com.sk89q.worldedit.event.platform.Interaction.HIT;
-import javax.script.ScriptException;
+import static com.sk89q.worldedit.event.platform.Interaction.OPEN;
 
 /**
  * The entry point and container for a working implementation of WorldEdit.
@@ -95,7 +93,7 @@ import javax.script.ScriptException;
  */
 public final class WorldEdit {
 
-    public static final Logger logger = Logger.getLogger(WorldEdit.class.getCanonicalName());
+    public static final Logger logger = LoggerFactory.getLogger(WorldEdit.class);
 
     private static final WorldEdit instance = new WorldEdit();
     private static String version;
@@ -112,7 +110,6 @@ public final class WorldEdit {
     private final PatternFactory patternFactory = new PatternFactory(this);
 
     static {
-        WorldEditPrefixHandler.register("com.sk89q.worldedit");
         getVersion();
     }
 
@@ -655,13 +652,13 @@ public final class WorldEdit {
         } catch (ScriptException e) {
             player.printError("Failed to execute:");
             player.printRaw(e.getMessage());
-            logger.log(Level.WARNING, "Failed to execute script", e);
+            logger.warn("Failed to execute script", e);
         } catch (NumberFormatException | WorldEditException e) {
             throw e;
         } catch (Throwable e) {
             player.printError("Failed to execute (see console):");
             player.printRaw(e.getClass().getCanonicalName());
-            logger.log(Level.WARNING, "Failed to execute script", e);
+            logger.warn("Failed to execute script", e);
         } finally {
             for (EditSession editSession : scriptContext.getEditSessions()) {
                 editSession.flushSession();

worldedit-core/src/main/java/com/sk89q/worldedit/command/SchematicCommands.java

@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.command;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.google.common.collect.Multimap;
 import com.google.common.io.Files;
 import com.sk89q.minecraft.util.commands.Command;
@@ -48,6 +46,8 @@ import com.sk89q.worldedit.util.command.binding.Switch;
 import com.sk89q.worldedit.util.command.parametric.Optional;
 import com.sk89q.worldedit.util.io.Closer;
 import com.sk89q.worldedit.util.io.file.FilenameException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
@@ -58,10 +58,10 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 import java.util.regex.Pattern;
 
+import static com.google.common.base.Preconditions.checkNotNull;
+
 /**
  * Commands that work with schematic files.
  */
@@ -71,7 +71,7 @@ public class SchematicCommands {
      * 9 schematics per page fits in the MC chat window.
      */
     private static final int SCHEMATICS_PER_PAGE = 9;
-    private static final Logger log = Logger.getLogger(SchematicCommands.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(SchematicCommands.class);
     private final WorldEdit worldEdit;
 
     /**
@@ -123,7 +123,7 @@ public class SchematicCommands {
             player.print(filename + " loaded. Paste it with //paste");
         } catch (IOException e) {
             player.printError("Schematic could not read or it does not exist: " + e.getMessage());
-            log.log(Level.WARNING, "Failed to load a saved clipboard", e);
+            log.warn("Failed to load a saved clipboard", e);
         }
     }
 
@@ -179,7 +179,7 @@ public class SchematicCommands {
             player.print(filename + " saved.");
         } catch (IOException e) {
             player.printError("Schematic could not written: " + e.getMessage());
-            log.log(Level.WARNING, "Failed to write a saved clipboard", e);
+            log.warn("Failed to write a saved clipboard", e);
         }
     }
 

worldedit-core/src/main/java/com/sk89q/worldedit/command/SnapshotCommands.java

@@ -40,14 +40,12 @@ import java.text.DateFormat;
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
 import java.util.List;
-import java.util.logging.Logger;
 
 /**
  * Snapshot commands.
  */
 public class SnapshotCommands {
 
-    private static final Logger logger = Logger.getLogger("Minecraft.WorldEdit");
     private static final DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss z");
     
     private final WorldEdit we;
@@ -93,10 +91,10 @@ public class SnapshotCommands {
                 File dir = config.snapshotRepo.getDirectory();
 
                 try {
-                    logger.info("WorldEdit found no snapshots: looked in: "
+                    WorldEdit.logger.info("WorldEdit found no snapshots: looked in: "
                             + dir.getCanonicalPath());
                 } catch (IOException e) {
-                    logger.info("WorldEdit found no snapshots: looked in "
+                    WorldEdit.logger.info("WorldEdit found no snapshots: looked in "
                             + "(NON-RESOLVABLE PATH - does it exist?): "
                             + dir.getPath());
                 }

worldedit-core/src/main/java/com/sk89q/worldedit/command/SnapshotUtilCommands.java

@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.command;
 
-import static com.sk89q.minecraft.util.commands.Logging.LogMode.REGION;
-
 import com.sk89q.minecraft.util.commands.Command;
 import com.sk89q.minecraft.util.commands.CommandContext;
 import com.sk89q.minecraft.util.commands.CommandPermissions;
@@ -41,12 +39,11 @@ import com.sk89q.worldedit.world.storage.MissingWorldException;
 
 import java.io.File;
 import java.io.IOException;
-import java.util.logging.Logger;
+
+import static com.sk89q.minecraft.util.commands.Logging.LogMode.REGION;
 
 public class SnapshotUtilCommands {
 
-    private static final Logger logger = Logger.getLogger("Minecraft.WorldEdit");
-
     private final WorldEdit we;
 
     public SnapshotUtilCommands(WorldEdit we) {
@@ -97,10 +94,10 @@ public class SnapshotUtilCommands {
                     File dir = config.snapshotRepo.getDirectory();
 
                     try {
-                        logger.info("WorldEdit found no snapshots: looked in: "
+                        WorldEdit.logger.info("WorldEdit found no snapshots: looked in: "
                                 + dir.getCanonicalPath());
                     } catch (IOException e) {
-                        logger.info("WorldEdit found no snapshots: looked in "
+                        WorldEdit.logger.info("WorldEdit found no snapshots: looked in "
                                 + "(NON-RESOLVABLE PATH - does it exist?): "
                                 + dir.getPath());
                     }

worldedit-core/src/main/java/com/sk89q/worldedit/extension/platform/CommandManager.java

@@ -19,9 +19,6 @@
 
 package com.sk89q.worldedit.extension.platform;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-import static com.sk89q.worldedit.util.command.composition.LegacyCommandAdapter.adapt;
-
 import com.google.common.base.Joiner;
 import com.sk89q.minecraft.util.commands.CommandException;
 import com.sk89q.minecraft.util.commands.CommandLocals;
@@ -79,14 +76,18 @@ import com.sk89q.worldedit.util.formatting.ColorCodeBuilder;
 import com.sk89q.worldedit.util.formatting.component.CommandUsageBox;
 import com.sk89q.worldedit.util.logging.DynamicStreamHandler;
 import com.sk89q.worldedit.util.logging.LogFormat;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.File;
 import java.io.IOException;
 import java.util.logging.FileHandler;
 import java.util.logging.Level;
-import java.util.logging.Logger;
 import java.util.regex.Pattern;
 
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.sk89q.worldedit.util.command.composition.LegacyCommandAdapter.adapt;
+
 /**
  * Handles the registration and invocation of commands.
  *
@@ -95,8 +96,9 @@ import java.util.regex.Pattern;
 public final class CommandManager {
 
     public static final Pattern COMMAND_CLEAN_PATTERN = Pattern.compile("^[/]+");
-    private static final Logger log = Logger.getLogger(CommandManager.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(CommandManager.class);
-    private static final Logger commandLog = Logger.getLogger(CommandManager.class.getCanonicalName() + ".CommandLog");
+    private static final java.util.logging.Logger commandLog =
+        java.util.logging.Logger.getLogger(CommandManager.class.getCanonicalName() + ".CommandLog");
     private static final Pattern numberFormatExceptionPattern = Pattern.compile("^For input string: \"(.*)\"$");
 
     private final WorldEdit worldEdit;
@@ -189,7 +191,7 @@ public final class CommandManager {
     }
 
     void register(Platform platform) {
-        log.log(Level.FINE, "Registering commands with " + platform.getClass().getCanonicalName());
+        log.info("Registering commands with " + platform.getClass().getCanonicalName());
 
         LocalConfiguration config = platform.getConfiguration();
         boolean logging = config.logCommands;
@@ -203,12 +205,12 @@ public final class CommandManager {
             File file = new File(config.getWorkingDirectory(), path);
             commandLog.setLevel(Level.ALL);
 
-            log.log(Level.INFO, "Logging WorldEdit commands to " + file.getAbsolutePath());
+            log.info("Logging WorldEdit commands to " + file.getAbsolutePath());
 
             try {
                 dynamicHandler.setHandler(new FileHandler(file.getAbsolutePath(), true));
             } catch (IOException e) {
-                log.log(Level.WARNING, "Could not use command log file " + path + ": " + e.getMessage());
+                log.warn("Could not use command log file " + path + ": " + e.getMessage());
             }
 
             dynamicHandler.setFormatter(new LogFormat(config.logFormat));
@@ -302,14 +304,14 @@ public final class CommandManager {
             Throwable t = e.getCause();
             actor.printError("Please report this error: [See console]");
             actor.printRaw(t.getClass().getName() + ": " + t.getMessage());
-            log.log(Level.SEVERE, "An unexpected error while handling a WorldEdit command", t);
+            log.error("An unexpected error while handling a WorldEdit command", t);
         } catch (CommandException e) {
             String message = e.getMessage();
             if (message != null) {
                 actor.printError(e.getMessage());
             } else {
                 actor.printError("An unknown error has occurred! Please see console.");
-                log.log(Level.SEVERE, "An unknown error occurred", e);
+                log.error("An unknown error occurred", e);
             }
         } finally {
             EditSession editSession = locals.get(EditSession.class);
@@ -359,7 +361,7 @@ public final class CommandManager {
         return dispatcher;
     }
 
-    public static Logger getLogger() {
+    public static java.util.logging.Logger getLogger() {
         return commandLog;
     }
 

worldedit-core/src/main/java/com/sk89q/worldedit/extension/platform/PlatformManager.java

@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.extension.platform;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.sk89q.worldedit.LocalConfiguration;
 import com.sk89q.worldedit.LocalSession;
 import com.sk89q.worldedit.WorldEdit;
@@ -44,7 +42,10 @@ import com.sk89q.worldedit.util.HandSide;
 import com.sk89q.worldedit.util.Location;
 import com.sk89q.worldedit.util.eventbus.Subscribe;
 import com.sk89q.worldedit.world.World;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
+import javax.annotation.Nullable;
 import java.util.ArrayList;
 import java.util.EnumMap;
 import java.util.Iterator;
@@ -52,10 +53,8 @@ import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.concurrent.atomic.AtomicBoolean;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
-import javax.annotation.Nullable;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
  * Manages registered {@link Platform}s for WorldEdit. Platforms are
@@ -65,7 +64,7 @@ import javax.annotation.Nullable;
  */
 public class PlatformManager {
 
-    private static final Logger logger = Logger.getLogger(PlatformManager.class.getCanonicalName());
+    private static final Logger logger = LoggerFactory.getLogger(PlatformManager.class);
 
     private final WorldEdit worldEdit;
     private final CommandManager commandManager;
@@ -97,7 +96,7 @@ public class PlatformManager {
     public synchronized void register(Platform platform) {
         checkNotNull(platform);
 
-        logger.log(Level.FINE, "Got request to register " + platform.getClass() + " with WorldEdit [" + super.toString() + "]");
+        logger.info("Got request to register " + platform.getClass() + " with WorldEdit [" + super.toString() + "]");
 
         // Just add the platform to the list of platforms: we'll pick favorites
         // once all the platforms have been loaded
@@ -106,7 +105,7 @@ public class PlatformManager {
         // Make sure that versions are in sync
         if (firstSeenVersion != null) {
             if (!firstSeenVersion.equals(platform.getVersion())) {
-                logger.log(Level.WARNING, "Multiple ports of WorldEdit are installed but they report different versions ({0} and {1}). " +
+                logger.warn("Multiple ports of WorldEdit are installed but they report different versions ({0} and {1}). " +
                                 "If these two versions are truly different, then you may run into unexpected crashes and errors.",
                         new Object[]{ firstSeenVersion, platform.getVersion() });
             }
@@ -129,7 +128,7 @@ public class PlatformManager {
         boolean removed = platforms.remove(platform);
 
         if (removed) {
-            logger.log(Level.FINE, "Unregistering " + platform.getClass().getCanonicalName() + " from WorldEdit");
+            logger.info("Unregistering " + platform.getClass().getCanonicalName() + " from WorldEdit");
 
             boolean choosePreferred = false;
 

worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/ClipboardFormats.java

@@ -19,13 +19,12 @@
 
 package com.sk89q.worldedit.extent.clipboard.io;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.google.common.collect.HashMultimap;
 import com.google.common.collect.Multimap;
 import com.google.common.collect.Multimaps;
 import com.sk89q.worldedit.WorldEdit;
 
+import javax.annotation.Nullable;
 import java.io.File;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -35,7 +34,7 @@ import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 
-import javax.annotation.Nullable;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 public class ClipboardFormats {
 
@@ -51,7 +50,7 @@ public class ClipboardFormats {
             ClipboardFormat old = aliasMap.put(lowKey, format);
             if (old != null) {
                 aliasMap.put(lowKey, old);
-                WorldEdit.logger.warning(format.getClass().getName() + " cannot override existing alias '" + lowKey + "' used by " + old.getClass().getName());
+                WorldEdit.logger.warn(format.getClass().getName() + " cannot override existing alias '" + lowKey + "' used by " + old.getClass().getName());
             }
         }
         for (String ext : format.getFileExtensions()) {

worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/MCEditSchematicReader.java

@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.extent.clipboard.io;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.sk89q.jnbt.ByteArrayTag;
 import com.sk89q.jnbt.CompoundTag;
 import com.sk89q.jnbt.IntTag;
@@ -45,14 +43,16 @@ import com.sk89q.worldedit.world.entity.EntityType;
 import com.sk89q.worldedit.world.entity.EntityTypes;
 import com.sk89q.worldedit.world.registry.LegacyMapper;
 import com.sk89q.worldedit.world.storage.NBTConversions;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.logging.Level;
+
-import java.util.logging.Logger;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
  * Reads schematic files that are compatible with MCEdit and other editors.
@@ -66,7 +66,7 @@ public class MCEditSchematicReader extends NBTSchematicReader {
         // TODO Add a handler for skulls, flower pots, note blocks, etc.
     }
 
-    private static final Logger log = Logger.getLogger(MCEditSchematicReader.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(MCEditSchematicReader.class);
     private final NBTInputStream inputStream;
 
     /**
@@ -230,15 +230,15 @@ public class MCEditSchematicReader extends NBTSchematicReader {
                                 clipboard.setBlock(region.getMinimumPoint().add(pt), state);
                             }
                         } else {
-                            log.warning("Unknown block when pasting schematic: " + blocks[index] + ":" + blockData[index] + ". Please report this issue.");
+                            log.warn("Unknown block when pasting schematic: " + blocks[index] + ":" + blockData[index] + ". Please report this issue.");
                         }
                     } catch (WorldEditException e) {
                         switch (failedBlockSets) {
                             case 0:
-                                log.log(Level.WARNING, "Failed to set block on a Clipboard", e);
+                                log.warn("Failed to set block on a Clipboard", e);
                                 break;
                             case 1:
-                                log.log(Level.WARNING, "Failed to set block on a Clipboard (again) -- no more messages will be logged", e);
+                                log.warn("Failed to set block on a Clipboard (again) -- no more messages will be logged", e);
                                 break;
                             default:
                         }
@@ -268,7 +268,7 @@ public class MCEditSchematicReader extends NBTSchematicReader {
                             BaseEntity state = new BaseEntity(entityType, compound);
                             clipboard.createEntity(location, state);
                         } else {
-                            log.warning("Unknown entity when pasting schematic: " + id.toLowerCase());
+                            log.warn("Unknown entity when pasting schematic: " + id.toLowerCase());
                         }
                     }
                 }

worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/SpongeSchematicReader.java

@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.extent.clipboard.io;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.google.common.collect.Maps;
 import com.sk89q.jnbt.ByteArrayTag;
 import com.sk89q.jnbt.CompoundTag;
@@ -42,15 +40,18 @@ import com.sk89q.worldedit.math.BlockVector3;
 import com.sk89q.worldedit.regions.CuboidRegion;
 import com.sk89q.worldedit.regions.Region;
 import com.sk89q.worldedit.world.block.BlockState;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.logging.Logger;
 import java.util.stream.Collectors;
 
+import static com.google.common.base.Preconditions.checkNotNull;
+
 /**
  * Reads schematic files using the Sponge Schematic Specification.
  */
@@ -62,7 +63,7 @@ public class SpongeSchematicReader extends NBTSchematicReader {
         // If NBT Compat handlers are needed - add them here.
     }
 
-    private static final Logger log = Logger.getLogger(SpongeSchematicReader.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(SpongeSchematicReader.class);
     private final NBTInputStream inputStream;
 
     /**

worldedit-core/src/main/java/com/sk89q/worldedit/internal/command/CommandLoggingHandler.java

@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.internal.command;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.sk89q.minecraft.util.commands.CommandContext;
 import com.sk89q.minecraft.util.commands.CommandException;
 import com.sk89q.minecraft.util.commands.Logging;
@@ -40,6 +38,8 @@ import java.lang.reflect.Method;
 import java.util.logging.Handler;
 import java.util.logging.Logger;
 
+import static com.google.common.base.Preconditions.checkNotNull;
+
 /**
  * Logs called commands to a logger.
  */

worldedit-core/src/main/java/com/sk89q/worldedit/math/interpolation/ReparametrisingInterpolation.java

@@ -21,14 +21,15 @@
 
 package com.sk89q.worldedit.math.interpolation;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.sk89q.worldedit.math.Vector3;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.util.List;
 import java.util.Map.Entry;
 import java.util.TreeMap;
-import java.util.logging.Logger;
+
+import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
  * Reparametrises another interpolation function by arc length.
@@ -38,7 +39,7 @@ import java.util.logging.Logger;
  */
 public class ReparametrisingInterpolation implements Interpolation {
 
-    private static final Logger log = Logger.getLogger(ReparametrisingInterpolation.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(ReparametrisingInterpolation.class);
 
     private final Interpolation baseInterpolation;
     private double totalArcLength;
@@ -102,7 +103,7 @@ public class ReparametrisingInterpolation implements Interpolation {
 
         Entry<Double, Double> ceilingEntry = cache.ceilingEntry(arc);
         if (ceilingEntry == null) {
-            log.warning("Error in arcToParameter: no ceiling entry for " + arc + " found!");
+            log.warn("Error in arcToParameter: no ceiling entry for " + arc + " found!");
             return 0;
         }
         final double rightArc = ceilingEntry.getKey();

worldedit-core/src/main/java/com/sk89q/worldedit/session/SessionManager.java

@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.session;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.ListenableFuture;
 import com.google.common.util.concurrent.ListeningExecutorService;
@@ -36,7 +34,10 @@ import com.sk89q.worldedit.session.storage.VoidStore;
 import com.sk89q.worldedit.util.concurrency.EvenMoreExecutors;
 import com.sk89q.worldedit.util.eventbus.Subscribe;
 import com.sk89q.worldedit.world.gamemode.GameModes;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
+import javax.annotation.Nullable;
 import java.io.File;
 import java.io.IOException;
 import java.util.HashMap;
@@ -46,10 +47,8 @@ import java.util.Timer;
 import java.util.TimerTask;
 import java.util.UUID;
 import java.util.concurrent.Callable;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
-import javax.annotation.Nullable;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
  * Session manager for WorldEdit.
@@ -63,7 +62,7 @@ public class SessionManager {
     public static int EXPIRATION_GRACE = 600000;
     private static final int FLUSH_PERIOD = 1000 * 30;
     private static final ListeningExecutorService executorService = MoreExecutors.listeningDecorator(EvenMoreExecutors.newBoundedCachedThreadPool(0, 1, 5));
-    private static final Logger log = Logger.getLogger(SessionManager.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(SessionManager.class);
     private final Timer timer = new Timer();
     private final WorldEdit worldEdit;
     private final Map<UUID, SessionHolder> sessions = new HashMap<>();
@@ -149,7 +148,7 @@ public class SessionManager {
                 session = store.load(getKey(sessionKey));
                 session.postLoad();
             } catch (IOException e) {
-                log.log(Level.WARNING, "Failed to load saved session", e);
+                log.warn("Failed to load saved session", e);
                 session = new LocalSession();
             }
 
@@ -210,7 +209,7 @@ public class SessionManager {
                     try {
                         store.save(getKey(key), entry.getValue());
                     } catch (IOException e) {
-                        log.log(Level.WARNING, "Failed to write session for UUID " + getKey(key), e);
+                        log.warn("Failed to write session for UUID " + getKey(key), e);
                         exception = e;
                     }
                 }

worldedit-core/src/main/java/com/sk89q/worldedit/session/storage/JsonFileSessionStore.java

@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.session.storage;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.JsonIOException;
@@ -28,6 +26,8 @@ import com.google.gson.JsonParseException;
 import com.sk89q.worldedit.LocalSession;
 import com.sk89q.worldedit.util.gson.GsonUtil;
 import com.sk89q.worldedit.util.io.Closer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.BufferedReader;
 import java.io.BufferedWriter;
@@ -37,8 +37,8 @@ import java.io.FileReader;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.util.UUID;
-import java.util.logging.Level;
+
-import java.util.logging.Logger;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
  * Stores sessions as JSON files in a directory.
@@ -47,7 +47,7 @@ import java.util.logging.Logger;
  */
 public class JsonFileSessionStore implements SessionStore {
 
-    private static final Logger log = Logger.getLogger(JsonFileSessionStore.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(JsonFileSessionStore.class);
     private final Gson gson;
     private final File dir;
 
@@ -61,7 +61,7 @@ public class JsonFileSessionStore implements SessionStore {
 
         if (!dir.isDirectory()) {
             if (!dir.mkdirs()) {
-                log.log(Level.WARNING, "Failed to create directory '" + dir.getPath() + "' for sessions");
+                log.warn("Failed to create directory '" + dir.getPath() + "' for sessions");
             }
         }
 
@@ -111,12 +111,12 @@ public class JsonFileSessionStore implements SessionStore {
 
         if (finalFile.exists()) {
             if (!finalFile.delete()) {
-                log.log(Level.WARNING, "Failed to delete " + finalFile.getPath() + " so the .tmp file can replace it");
+                log.warn("Failed to delete " + finalFile.getPath() + " so the .tmp file can replace it");
             }
         }
 
         if (!tempFile.renameTo(finalFile)) {
-            log.log(Level.WARNING, "Failed to rename temporary session file to " + finalFile.getPath());
+            log.warn("Failed to rename temporary session file to " + finalFile.getPath());
         }
     }
 

worldedit-core/src/main/java/com/sk89q/worldedit/util/PropertiesConfiguration.java

@@ -27,6 +27,8 @@ import com.sk89q.worldedit.LocalSession;
 import com.sk89q.worldedit.util.report.Unreported;
 import com.sk89q.worldedit.world.registry.LegacyMapper;
 import com.sk89q.worldedit.world.snapshot.SnapshotRepository;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.File;
 import java.io.FileInputStream;
@@ -39,8 +41,6 @@ import java.util.Arrays;
 import java.util.HashSet;
 import java.util.Properties;
 import java.util.Set;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 /**
  * Simple LocalConfiguration that loads settings using
@@ -48,7 +48,7 @@ import java.util.logging.Logger;
  */
 public class PropertiesConfiguration extends LocalConfiguration {
 
-    @Unreported private static final Logger log = Logger.getLogger(PropertiesConfiguration.class.getCanonicalName());
+    @Unreported private static final Logger log = LoggerFactory.getLogger(PropertiesConfiguration.class);
 
     @Unreported protected Properties properties;
     @Unreported protected File path;
@@ -70,7 +70,7 @@ public class PropertiesConfiguration extends LocalConfiguration {
             properties.load(stream);
         } catch (FileNotFoundException ignored) {
         } catch (IOException e) {
-            log.log(Level.WARNING, "Failed to read configuration", e);
+            log.warn("Failed to read configuration", e);
         }
 
         loadExtra();
@@ -131,7 +131,7 @@ public class PropertiesConfiguration extends LocalConfiguration {
         try (OutputStream output = new FileOutputStream(path)) {
             properties.store(output, "Don't put comments; they get removed");
         } catch (IOException e) {
-            log.log(Level.WARNING, "Failed to write configuration", e);
+            log.warn("Failed to write configuration", e);
         }
     }
 

worldedit-core/src/main/java/com/sk89q/worldedit/util/YAMLConfiguration.java

@@ -26,11 +26,10 @@ import com.sk89q.worldedit.LocalSession;
 import com.sk89q.worldedit.session.SessionManager;
 import com.sk89q.worldedit.util.report.Unreported;
 import com.sk89q.worldedit.world.snapshot.SnapshotRepository;
+import org.slf4j.Logger;
 
 import java.io.IOException;
 import java.util.HashSet;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 /**
  * A less simple implementation of {@link LocalConfiguration}
@@ -51,7 +50,7 @@ public class YAMLConfiguration extends LocalConfiguration {
         try {
             config.load();
         } catch (IOException e) {
-            logger.log(Level.WARNING, "Error loading WorldEdit configuration", e);
+            logger.warn("Error loading WorldEdit configuration", e);
         }
 
         profile = config.getBoolean("debug", profile);

worldedit-core/src/main/java/com/sk89q/worldedit/util/eventbus/EventBus.java

@@ -19,13 +19,13 @@
 
 package com.sk89q.worldedit.util.eventbus;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.google.common.collect.Multimap;
 import com.google.common.collect.Multimaps;
 import com.google.common.collect.SetMultimap;
 import com.google.common.eventbus.DeadEvent;
 import com.sk89q.worldedit.internal.annotation.RequiresNewerGuava;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.lang.reflect.InvocationTargetException;
 import java.util.ArrayList;
@@ -36,8 +36,8 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
-import java.util.logging.Level;
+
-import java.util.logging.Logger;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
  * Dispatches events to listeners, and provides ways for listeners to register
@@ -53,7 +53,7 @@ import java.util.logging.Logger;
  */
 public class EventBus {
 
-    private final Logger logger = Logger.getLogger(EventBus.class.getCanonicalName());
+    private final Logger logger = LoggerFactory.getLogger(EventBus.class);
 
     private final SetMultimap<Class<?>, EventHandler> handlersByType =
             Multimaps.newSetMultimap(new HashMap<>(), this::newHandlerSet);
@@ -186,8 +186,7 @@ public class EventBus {
         try {
             handler.handleEvent(event);
         } catch (InvocationTargetException e) {
-            logger.log(Level.SEVERE,
+            logger.error("Could not dispatch event: " + event + " to handler " + handler, e);
-                    "Could not dispatch event: " + event + " to handler " + handler, e);
         }
     }
 

worldedit-core/src/main/java/com/sk89q/worldedit/util/io/Closer.java

@@ -19,23 +19,23 @@
 
 package com.sk89q.worldedit.util.io;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Throwables;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.Closeable;
 import java.io.IOException;
 import java.lang.reflect.Method;
 import java.util.ArrayDeque;
 import java.util.Deque;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 import java.util.zip.ZipFile;
 
+import static com.google.common.base.Preconditions.checkNotNull;
+
 public final class Closer implements Closeable {
 
-    private static final Logger logger = Logger.getLogger(Closer.class.getCanonicalName());
+    private static final Logger logger = LoggerFactory.getLogger(Closer.class);
 
     /**
      * The suppressor implementation to use for the current Java version.
@@ -218,7 +218,7 @@ public final class Closer implements Closeable {
         @Override
         public void suppress(Object closeable, Throwable thrown, Throwable suppressed) {
             // log to the same place as Closeables
-            logger.log(Level.WARNING, "Suppressing exception thrown when closing " + closeable, suppressed);
+            logger.warn("Suppressing exception thrown when closing " + closeable, suppressed);
         }
     }
 

worldedit-core/src/main/java/com/sk89q/worldedit/util/logging/WorldEditPrefixHandler.java

@@ -1,59 +0,0 @@
-/*
- * WorldEdit, a Minecraft world manipulation toolkit
- * Copyright (C) sk89q <http://www.sk89q.com>
- * Copyright (C) WorldEdit team and contributors
- *
- * This program is free software: you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License as published by the
- * Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
- * for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-package com.sk89q.worldedit.util.logging;
-
-import java.util.logging.Handler;
-import java.util.logging.LogRecord;
-import java.util.logging.Logger;
-
-/**
- * Adds a WorldEdit prefix to WorldEdit's logger messages using a handler.
- */
-public final class WorldEditPrefixHandler extends Handler {
-
-    private WorldEditPrefixHandler() {
-    }
-
-    @Override
-    public void publish(LogRecord record) {
-        String message = record.getMessage();
-        if (!message.startsWith("WorldEdit: ") && !message.startsWith("[WorldEdit] ")) {
-            record.setMessage("[WorldEdit] " + message);
-        }
-    }
-
-    @Override
-    public void flush() {
-    }
-
-    @Override
-    public void close() throws SecurityException {
-    }
-
-    /**
-     * Add the handler to the following logger name.
-     *
-     * @param name the logger name
-     */
-    public static void register(String name) {
-        Logger.getLogger(name).addHandler(new WorldEditPrefixHandler());
-    }
-
-}

worldedit-core/src/main/java/com/sk89q/worldedit/util/paste/ActorCallbackPaste.java

@@ -26,14 +26,14 @@ import com.sk89q.worldedit.command.util.AsyncCommandHelper;
 import com.sk89q.worldedit.extension.platform.Actor;
 import com.sk89q.worldedit.util.command.parametric.ExceptionConverter;
 import com.sk89q.worldedit.util.task.Supervisor;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.net.URL;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 public class ActorCallbackPaste {
 
-    private static final Logger LOGGER = Logger.getLogger(ActorCallbackPaste.class.getSimpleName());
+    private static final Logger LOGGER = LoggerFactory.getLogger(ActorCallbackPaste.class);
 
     private ActorCallbackPaste() {
     }
@@ -62,7 +62,7 @@ public class ActorCallbackPaste {
 
             @Override
             public void onFailure(Throwable throwable) {
-                LOGGER.log(Level.WARNING, "Failed to submit pastebin", throwable);
+                LOGGER.warn("Failed to submit pastebin", throwable);
                 sender.printError("Failed to submit to a pastebin. Please see console for the error.");
             }
         });

worldedit-core/src/main/java/com/sk89q/worldedit/util/report/ShallowObjectReport.java

@@ -19,16 +19,17 @@
 
 package com.sk89q.worldedit.util.report;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
 public class ShallowObjectReport extends DataReport {
 
-    private static final Logger log = Logger.getLogger(ShallowObjectReport.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(ShallowObjectReport.class);
 
     public ShallowObjectReport(String title, Object object) {
         super(title);
@@ -52,7 +53,7 @@ public class ShallowObjectReport extends DataReport {
                 Object value = field.get(object);
                 append(field.getName(), String.valueOf(value));
             } catch (IllegalAccessException e) {
-                log.log(Level.WARNING, "Failed to get value of '" + field.getName() + "' on " + type);
+                log.warn("Failed to get value of '" + field.getName() + "' on " + type);
             }
         }
     }

worldedit-core/src/main/java/com/sk89q/worldedit/world/block/BlockState.java

@@ -107,7 +107,7 @@ public class BlockState implements BlockStateHolder<BlockState> {
                         states.put(property, value, modifiedState);
                     } else {
                         System.out.println(stateMap);
-                        WorldEdit.logger.warning("Found a null state at " + this.withValue(property, value));
+                        WorldEdit.logger.warn("Found a null state at " + this.withValue(property, value));
                     }
                 }
             });

worldedit-core/src/main/java/com/sk89q/worldedit/world/chunk/AnvilChunk.java

@@ -36,12 +36,11 @@ import com.sk89q.worldedit.world.block.BlockTypes;
 import com.sk89q.worldedit.world.registry.LegacyMapper;
 import com.sk89q.worldedit.world.storage.InvalidFormatException;
 
+import javax.annotation.Nullable;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
-import javax.annotation.Nullable;
-
 public class AnvilChunk implements Chunk {
 
     private CompoundTag rootTag;
@@ -259,7 +258,7 @@ public class AnvilChunk implements Chunk {
 
         BlockState state = LegacyMapper.getInstance().getBlockFromLegacy(id, data);
         if (state == null) {
-            WorldEdit.logger.warning("Unknown legacy block " + id + ":" + data + " found when loading legacy anvil chunk.");
+            WorldEdit.logger.warn("Unknown legacy block " + id + ":" + data + " found when loading legacy anvil chunk.");
             return BlockTypes.AIR.getDefaultState().toBaseBlock();
         }
         CompoundTag tileEntity = getBlockTileEntity(position);

worldedit-core/src/main/java/com/sk89q/worldedit/world/chunk/OldChunk.java

@@ -182,7 +182,7 @@ public class OldChunk implements Chunk {
 
         BlockState state = LegacyMapper.getInstance().getBlockFromLegacy(id, dataVal);
         if (state == null) {
-            WorldEdit.logger.warning("Unknown legacy block " + id + ":" + dataVal + " found when loading legacy anvil chunk.");
+            WorldEdit.logger.warn("Unknown legacy block " + id + ":" + dataVal + " found when loading legacy anvil chunk.");
             return BlockTypes.AIR.getDefaultState().toBaseBlock();
         }
 

worldedit-core/src/main/java/com/sk89q/worldedit/world/registry/BundledBlockData.java

@@ -25,17 +25,16 @@ import com.google.gson.GsonBuilder;
 import com.google.gson.reflect.TypeToken;
 import com.sk89q.worldedit.math.Vector3;
 import com.sk89q.worldedit.util.gson.VectorAdapter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
+import javax.annotation.Nullable;
 import java.io.IOException;
 import java.net.URL;
 import java.nio.charset.Charset;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.logging.Level;
-import java.util.logging.Logger;
-
-import javax.annotation.Nullable;
 
 /**
  * Provides block data based on the built-in block database that is bundled
@@ -50,7 +49,7 @@ import javax.annotation.Nullable;
  */
 public class BundledBlockData {
 
-    private static final Logger log = Logger.getLogger(BundledBlockData.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(BundledBlockData.class);
     private static BundledBlockData INSTANCE;
 
     private final Map<String, BlockEntry> idMap = new HashMap<>();
@@ -62,7 +61,7 @@ public class BundledBlockData {
         try {
             loadFromResource();
         } catch (Throwable e) {
-            log.log(Level.WARNING, "Failed to load the built-in block registry", e);
+            log.warn("Failed to load the built-in block registry", e);
         }
     }
 

worldedit-core/src/main/java/com/sk89q/worldedit/world/registry/BundledItemData.java

@@ -25,17 +25,16 @@ import com.google.gson.GsonBuilder;
 import com.google.gson.reflect.TypeToken;
 import com.sk89q.worldedit.math.Vector3;
 import com.sk89q.worldedit.util.gson.VectorAdapter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
+import javax.annotation.Nullable;
 import java.io.IOException;
 import java.net.URL;
 import java.nio.charset.Charset;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.logging.Level;
-import java.util.logging.Logger;
-
-import javax.annotation.Nullable;
 
 /**
  * Provides item data based on the built-in item database that is bundled
@@ -50,7 +49,7 @@ import javax.annotation.Nullable;
  */
 public class BundledItemData {
 
-    private static final Logger log = Logger.getLogger(BundledItemData.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(BundledItemData.class);
     private static BundledItemData INSTANCE;
 
     private final Map<String, ItemEntry> idMap = new HashMap<>();
@@ -62,7 +61,7 @@ public class BundledItemData {
         try {
             loadFromResource();
         } catch (Throwable e) {
-            log.log(Level.WARNING, "Failed to load the built-in item registry", e);
+            log.warn("Failed to load the built-in item registry", e);
         }
     }
 

worldedit-core/src/main/java/com/sk89q/worldedit/world/registry/LegacyMapper.java

@@ -32,22 +32,21 @@ import com.sk89q.worldedit.util.gson.VectorAdapter;
 import com.sk89q.worldedit.world.block.BlockState;
 import com.sk89q.worldedit.world.item.ItemType;
 import com.sk89q.worldedit.world.item.ItemTypes;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
+import javax.annotation.Nullable;
 import java.io.IOException;
 import java.net.URL;
 import java.nio.charset.Charset;
 import java.util.Arrays;
 import java.util.Map;
-import java.util.logging.Level;
-import java.util.logging.Logger;
-
-import javax.annotation.Nullable;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
 public class LegacyMapper {
 
-    private static final Logger log = Logger.getLogger(LegacyMapper.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(LegacyMapper.class);
     private static LegacyMapper INSTANCE;
 
     private Multimap<String, BlockState> stringToBlockMap = HashMultimap.create();
@@ -62,7 +61,7 @@ public class LegacyMapper {
         try {
             loadFromResource();
         } catch (Throwable e) {
-            log.log(Level.WARNING, "Failed to load the built-in legacy id registry", e);
+            log.warn("Failed to load the built-in legacy id registry", e);
         }
     }
 
@@ -94,7 +93,7 @@ public class LegacyMapper {
                 blockToStringMap.put(state, id);
                 stringToBlockMap.put(id, state);
             } catch (Exception e) {
-                log.warning("Unknown block: " + blockEntry.getValue());
+                log.warn("Unknown block: " + blockEntry.getValue());
             }
         }
 
@@ -106,7 +105,7 @@ public class LegacyMapper {
                 itemToStringMap.put(type, id);
                 stringToItemMap.put(id, type);
             } catch (Exception e) {
-                log.warning("Unknown item: " + itemEntry.getValue());
+                log.warn("Unknown item: " + itemEntry.getValue());
             }
         }
     }

worldedit-core/src/main/java/com/sk89q/worldedit/world/snapshot/Snapshot.java

@@ -29,11 +29,12 @@ import com.sk89q.worldedit.world.storage.TrueZipLegacyChunkStore;
 import com.sk89q.worldedit.world.storage.TrueZipMcRegionChunkStore;
 import com.sk89q.worldedit.world.storage.ZippedLegacyChunkStore;
 import com.sk89q.worldedit.world.storage.ZippedMcRegionChunkStore;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.File;
 import java.io.IOException;
 import java.util.Calendar;
-import java.util.logging.Logger;
 import java.util.zip.ZipFile;
 
 /**
@@ -41,7 +42,7 @@ import java.util.zip.ZipFile;
  */
 public class Snapshot implements Comparable<Snapshot> {
 
-    protected static Logger logger = Logger.getLogger(Snapshot.class.getCanonicalName());
+    protected static Logger logger = LoggerFactory.getLogger(Snapshot.class);
 
     protected File file;
     protected String name;

worldedit-core/src/test/java/com/sk89q/minecraft/util/commands/CommandContextTest.java

@@ -19,23 +19,23 @@
 
 package com.sk89q.minecraft.util.commands;
 
+import org.junit.Before;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Arrays;
+import java.util.HashSet;
+
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
-import org.junit.Before;
-import org.junit.Test;
-
-import java.util.Arrays;
-import java.util.HashSet;
-import java.util.logging.Level;
-import java.util.logging.Logger;
-
 public class CommandContextTest {
 
-    private static final Logger log = Logger.getLogger(CommandContextTest.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(CommandContextTest.class);
     private static final String firstCmdString = "herpderp -opw testers \"mani world\" 'another thing'  because something";
     CommandContext firstCommand;
 
@@ -44,7 +44,7 @@ public class CommandContextTest {
         try {
             firstCommand = new CommandContext(firstCmdString, new HashSet<>(Arrays.asList('o', 'w')));
         } catch (CommandException e) {
-            log.log(Level.WARNING, "Error", e);
+            log.warn("Error", e);
             fail("Unexpected exception when creating CommandContext");
         }
     }
@@ -83,7 +83,7 @@ public class CommandContextTest {
             new CommandContext(cmd);
             new CommandContext(cmd2);
         } catch (CommandException e) {
-            log.log(Level.WARNING, "Error", e);
+            log.warn("Error", e);
             fail("Error creating CommandContext");
         }
     }
@@ -94,7 +94,7 @@ public class CommandContextTest {
         try {
             new CommandContext(cmd);
         } catch (CommandException e) {
-            log.log(Level.WARNING, "Error", e);
+            log.warn("Error", e);
             fail("Error creating CommandContext");
         }
     }
@@ -105,7 +105,7 @@ public class CommandContextTest {
         try {
             new CommandContext(cmd);
         } catch (CommandException e) {
-            log.log(Level.WARNING, "Error", e);
+            log.warn("Error", e);
             fail("Error creating CommandContext");
         }
     }
@@ -119,7 +119,7 @@ public class CommandContextTest {
             CommandContext context2 = new CommandContext("r hello -f world");
             assertTrue(context2.hasFlag('f'));
         } catch (CommandException e) {
-            log.log(Level.WARNING, "Error", e);
+            log.warn("Error", e);
             fail("Error creating CommandContext");
         }
     }
@@ -135,7 +135,7 @@ public class CommandContextTest {
             CommandContext context2 = new CommandContext("pm name \"hello world\"   foo   bar");
             assertEquals("\"hello world\"   foo   bar", context2.getJoinedStrings(1));
         } catch (CommandException e) {
-            log.log(Level.WARNING, "Error", e);
+            log.warn("Error", e);
             fail("Error creating CommandContext");
         }
     }
@@ -147,7 +147,7 @@ public class CommandContextTest {
             assertArrayEquals(new String[] { "foo", "bar", "baz" }, context.getSlice(0));
 
         } catch (CommandException e) {
-            log.log(Level.WARNING, "Error", e);
+            log.warn("Error", e);
             fail("Error creating CommandContext");
         }
     }
@@ -158,7 +158,7 @@ public class CommandContextTest {
             CommandContext context = new CommandContext("region flag xmas blocked-cmds \"\"");
             assertEquals(context.argsLength(), 3);
         } catch (CommandException e) {
-            log.log(Level.WARNING, "Error", e);
+            log.warn("Error", e);
             fail("Error creating CommandContext");
         }
     }

worldedit-forge/build.gradle

@@ -18,6 +18,7 @@ def forgeVersion = "25.0.76"
 
 dependencies {
     compile project(':worldedit-core')
+    compile 'org.apache.logging.log4j:log4j-slf4j-impl:2.11.2'
 
     minecraft "net.minecraftforge:forge:${minecraftVersion}-${forgeVersion}"
 

worldedit-sponge/src/main/java/com/sk89q/worldedit/sponge/adapter/SpongeImplLoader.java

@@ -21,6 +21,8 @@ package com.sk89q.worldedit.sponge.adapter;
 
 import com.google.common.collect.Lists;
 import com.sk89q.worldedit.util.io.Closer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.File;
 import java.io.IOException;
@@ -30,15 +32,13 @@ import java.util.Enumeration;
 import java.util.List;
 import java.util.jar.JarEntry;
 import java.util.jar.JarFile;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 /**
  * Loads Sponge implementation adapters.
  */
 public class SpongeImplLoader {
 
-    private static final Logger log = Logger.getLogger(SpongeImplLoader.class.getCanonicalName());
+    private static final Logger log = LoggerFactory.getLogger(SpongeImplLoader.class);
     private final List<String> adapterCandidates = new ArrayList<>();
     private String customCandidate;
 
@@ -71,7 +71,7 @@ public class SpongeImplLoader {
         if (className != null) {
             customCandidate = className;
             adapterCandidates.add(className);
-            log.log(Level.INFO, "-Dworldedit.sponge.adapter used to add " + className + " to the list of available Sponge adapters");
+            log.info("-Dworldedit.sponge.adapter used to add " + className + " to the list of available Sponge adapters");
         }
     }
 
@@ -157,18 +157,18 @@ public class SpongeImplLoader {
                 if (SpongeImplAdapter.class.isAssignableFrom(cls)) {
                     suitableAdapters.add((SpongeImplAdapter) cls.newInstance());
                 } else {
-                    log.log(Level.WARNING, "Failed to load the Sponge adapter class '" + className +
+                    log.warn("Failed to load the Sponge adapter class '" + className +
                             "' because it does not implement " + SpongeImplAdapter.class.getCanonicalName());
                 }
             } catch (ClassNotFoundException e) {
-                log.log(Level.WARNING, "Failed to load the Sponge adapter class '" + className +
+                log.warn("Failed to load the Sponge adapter class '" + className +
                         "' that is not supposed to be missing", e);
             } catch (IllegalAccessException e) {
-                log.log(Level.WARNING, "Failed to load the Sponge adapter class '" + className +
+                log.warn("Failed to load the Sponge adapter class '" + className +
                         "' that is not supposed to be raising this error", e);
             } catch (Throwable e) {
                 if (className.equals(customCandidate)) {
-                    log.log(Level.WARNING, "Failed to load the Sponge adapter class '" + className + "'", e);
+                    log.warn("Failed to load the Sponge adapter class '" + className + "'", e);
                 }
             }
         }