Fix Java 12+ compatibility

worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_13/BukkitAdapter_1_13.java

@@ -7,6 +7,7 @@ import com.boydti.fawe.bukkit.adapter.NMSAdapter;
 import com.boydti.fawe.config.Settings;
 import com.boydti.fawe.object.collection.BitArray4096;
 import com.boydti.fawe.util.MathMan;
+import com.boydti.fawe.util.ReflectionUtils;
 import com.boydti.fawe.util.TaskManager;
 import com.sk89q.worldedit.world.block.BlockState;
 import com.sk89q.worldedit.world.block.BlockTypesCache;
@@ -83,11 +84,7 @@ public final class BukkitAdapter_1_13 extends NMSAdapter {
                 } catch (NoSuchFieldException paper) {
                     tmp = DataPaletteBlock.class.getDeclaredField("j");
                 }
-                Field modifiersField = Field.class.getDeclaredField("modifiers");
+                ReflectionUtils.setAccessibleNonFinal(tmp);
-                modifiersField.setAccessible(true);
-                int modifiers = modifiersField.getInt(tmp);
-                int newModifiers = modifiers & (~Modifier.FINAL);
-                if (newModifiers != modifiers) modifiersField.setInt(tmp, newModifiers);
                 fieldLock = tmp;
                 fieldLock.setAccessible(true);
             }

worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_14/BukkitAdapter_1_14.java

@@ -7,6 +7,7 @@ import com.boydti.fawe.bukkit.adapter.DelegateLock;
 import com.boydti.fawe.config.Settings;
 import com.boydti.fawe.object.collection.BitArray4096;
 import com.boydti.fawe.util.MathMan;
+import com.boydti.fawe.util.ReflectionUtils;
 import com.boydti.fawe.util.TaskManager;
 import com.sk89q.worldedit.world.block.BlockState;
 import com.sk89q.worldedit.world.block.BlockTypesCache;
@@ -83,11 +84,7 @@ public final class BukkitAdapter_1_14 extends NMSAdapter {
                 } catch (NoSuchFieldException paper) {
                     tmp = DataPaletteBlock.class.getDeclaredField("j");
                 }
-                Field modifiersField = Field.class.getDeclaredField("modifiers");
+                ReflectionUtils.setAccessibleNonFinal(tmp);
-                modifiersField.setAccessible(true);
-                int modifiers = modifiersField.getInt(tmp);
-                int newModifiers = modifiers & (~Modifier.FINAL);
-                if (newModifiers != modifiers) modifiersField.setInt(tmp, newModifiers);
                 fieldLock = tmp;
                 fieldLock.setAccessible(true);
             }

worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_15/BukkitAdapter_1_15.java

@@ -7,6 +7,7 @@ import com.boydti.fawe.bukkit.adapter.NMSAdapter;
 import com.boydti.fawe.config.Settings;
 import com.boydti.fawe.object.collection.BitArray4096;
 import com.boydti.fawe.util.MathMan;
+import com.boydti.fawe.util.ReflectionUtils;
 import com.boydti.fawe.util.TaskManager;
 import com.sk89q.worldedit.world.block.BlockState;
 import com.sk89q.worldedit.world.block.BlockTypesCache;
@@ -18,7 +19,6 @@ import org.bukkit.craftbukkit.v1_15_R1.CraftWorld;
 import sun.misc.Unsafe;
 
 import java.lang.reflect.Field;
-import java.lang.reflect.Modifier;
 import java.util.Arrays;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.locks.Lock;
@@ -66,11 +66,7 @@ public final class BukkitAdapter_1_15 extends NMSAdapter {
             fieldDirtyBits.setAccessible(true);
 
             Field tmp = DataPaletteBlock.class.getDeclaredField("j");
-            Field modifiersField = Field.class.getDeclaredField("modifiers");
+            ReflectionUtils.setAccessibleNonFinal(tmp);
-            modifiersField.setAccessible(true);
-            int modifiers = modifiersField.getInt(tmp);
-            int newModifiers = modifiers & (~Modifier.FINAL);
-            if (newModifiers != modifiers) modifiersField.setInt(tmp, newModifiers);
             fieldLock = tmp;
             fieldLock.setAccessible(true);
 

worldedit-core/src/main/java/com/boydti/fawe/object/collection/LocalBlockVector2DSet.java

@@ -141,7 +141,7 @@ public class LocalBlockVector2DSet implements Set<BlockVector2> {
 
     @Override
     public Object[] toArray() {
-        return toArray(null);
+        return toArray((Object[]) null);
     }
 
     @Override

worldedit-core/src/main/java/com/boydti/fawe/object/collection/LocalBlockVectorSet.java

@@ -160,7 +160,7 @@ public class LocalBlockVectorSet implements Set<BlockVector3> {
 
     @NotNull @Override
     public Object[] toArray() {
-        return toArray(null);
+        return toArray((Object[]) null);
     }
 
     @NotNull @Override

worldedit-core/src/main/java/com/boydti/fawe/util/ReflectionUtils.java

@@ -96,9 +96,8 @@ public class ReflectionUtils {
         return ReflectionFactory.getReflectionFactory().newConstructorAccessor(enumClass.getDeclaredConstructor(parameterTypes));
     }
 
-    public static void setFailsafeFieldValue(Field field, Object target, Object value)
+    public static void setAccessibleNonFinal(Field field)
-            throws NoSuchFieldException, IllegalAccessException {
+            throws NoSuchFieldException, IllegalAccessException, NoSuchMethodException, InvocationTargetException {
-
         // let's make the field accessible
         field.setAccessible(true);
 
@@ -106,6 +105,7 @@ public class ReflectionUtils {
         // not be final anymore, thus tricking reflection into
         // letting us modify the static final field
         if (Modifier.isFinal(field.getModifiers())) {
+            try {
                 Field modifiersField = Field.class.getDeclaredField("modifiers");
                 modifiersField.setAccessible(true);
                 int modifiers = modifiersField.getInt(field);
@@ -113,8 +113,27 @@ public class ReflectionUtils {
                 // blank out the final bit in the modifiers int
                 modifiers &= ~Modifier.FINAL;
                 modifiersField.setInt(field, modifiers);
+            } catch (NoSuchFieldException e) {
+                // Java 12+ compatibility - search fields with hidden method for modifiers
+                // same concept as above, just with a more hacky way of getting to the modifiers
+                Method getDeclaredFields0 = Class.class.getDeclaredMethod("getDeclaredFields0", boolean.class);
+                getDeclaredFields0.setAccessible(true);
+                Field[] fields = (Field[]) getDeclaredFields0.invoke(Field.class, false);
+                for (Field classField : fields) {
+                    if ("modifiers".equals(classField.getName())) {
+                        classField.setAccessible(true);
+                        classField.set(field, field.getModifiers() & ~Modifier.FINAL);
+                        break;
+                    }
+                }
+            }
+        }
     }
 
+    public static void setFailsafeFieldValue(Field field, Object target, Object value)
+            throws NoSuchFieldException, IllegalAccessException, NoSuchMethodException, InvocationTargetException {
+
+        setAccessibleNonFinal(field);
         try {
             FieldAccessor fa = ReflectionFactory.getReflectionFactory().newFieldAccessor(field, false);
             fa.set(target, value);
@@ -124,7 +143,7 @@ public class ReflectionUtils {
     }
 
     private static void blankField(Class<?> enumClass, String fieldName)
-            throws NoSuchFieldException, IllegalAccessException {
+            throws NoSuchFieldException, IllegalAccessException, NoSuchMethodException, InvocationTargetException {
         for (Field field : Class.class.getDeclaredFields()) {
             if (field.getName().contains(fieldName)) {
                 AccessibleObject.setAccessible(new Field[]{field}, true);
@@ -134,8 +153,8 @@ public class ReflectionUtils {
         }
     }
 
-    private static void cleanEnumCache(Class<?> enumClass)
+    static void cleanEnumCache(Class<?> enumClass)
-            throws NoSuchFieldException, IllegalAccessException {
+            throws NoSuchFieldException, IllegalAccessException, NoSuchMethodException, InvocationTargetException {
         blankField(enumClass, "enumConstantDirectory"); // Sun (Oracle?!?) JDK 1.5/6
         blankField(enumClass, "enumConstants"); // IBM JDK
     }

worldedit-core/src/main/java/com/boydti/fawe/util/ReflectionUtils9.java

@@ -2,7 +2,10 @@ package com.boydti.fawe.util;
 
 import sun.misc.Unsafe;
 
-import java.lang.reflect.*;
+import java.lang.reflect.AccessibleObject;
+import java.lang.reflect.Array;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -41,15 +44,15 @@ public class ReflectionUtils9 {
 
             // 5. Set new values field
             try {
-                setFailsafeFieldValue(valuesField, null,
+                ReflectionUtils.setFailsafeFieldValue(valuesField, null,
                         values.toArray((T[]) Array.newInstance(enumType, 0)));
             } catch (Throwable e) {
                 Field ordinalField = Enum.class.getDeclaredField("ordinal");
-                setFailsafeFieldValue(ordinalField, newValue, 0);
+                ReflectionUtils.setFailsafeFieldValue(ordinalField, newValue, 0);
             }
 
             // 6. Clean enum cache
-            cleanEnumCache(enumType);
+            ReflectionUtils.cleanEnumCache(enumType);
             return newValue;
         } catch (Exception e) {
             e.printStackTrace();
@@ -64,55 +67,11 @@ public class ReflectionUtils9 {
         Object instance = unsafe.allocateInstance(enumClass);
 
         Field ordinalField = Enum.class.getDeclaredField("ordinal");
-        setFailsafeFieldValue(ordinalField, instance, 0);
+        ReflectionUtils.setFailsafeFieldValue(ordinalField, instance, 0);
 
         Field nameField = Enum.class.getDeclaredField("name");
-        setFailsafeFieldValue(nameField, instance, value);
+        ReflectionUtils.setFailsafeFieldValue(nameField, instance, value);
 
         return instance;
     }
-
-    public static void setFailsafeFieldValue(Field field, Object target, Object value)
-            throws NoSuchFieldException, IllegalAccessException {
-
-        // let's make the field accessible
-        field.setAccessible(true);
-
-        // next we change the modifier in the Field instance to
-        // not be final anymore, thus tricking reflection into
-        // letting us modify the static final field
-        if (Modifier.isFinal(field.getModifiers())) {
-            Field modifiersField = Field.class.getDeclaredField("modifiers");
-            modifiersField.setAccessible(true);
-            int modifiers = modifiersField.getInt(field);
-
-            // blank out the final bit in the modifiers int
-            modifiers &= ~Modifier.FINAL;
-            modifiersField.setInt(field, modifiers);
-        }
-
-        try {
-            if (target == null) field.set(null, value);
-            else field.set(target, value);
-        } catch (NoSuchMethodError error) {
-            field.set(target, value);
-        }
-    }
-
-    private static void blankField(Class<?> enumClass, String fieldName)
-            throws NoSuchFieldException, IllegalAccessException {
-        for (Field field : Class.class.getDeclaredFields()) {
-            if (field.getName().contains(fieldName)) {
-                AccessibleObject.setAccessible(new Field[]{field}, true);
-                setFailsafeFieldValue(field, enumClass, null);
-                break;
-            }
-        }
-    }
-
-    private static void cleanEnumCache(Class<?> enumClass)
-            throws NoSuchFieldException, IllegalAccessException {
-        blankField(enumClass, "enumConstantDirectory"); // Sun (Oracle?!?) JDK 1.5/6
-        blankField(enumClass, "enumConstants"); // IBM JDK
-    }
 }