Fixed NPE when running a custom build of CraftBukkit. This fixes issue #BUKKIT-765

src/main/java/org/bukkit/craftbukkit/CraftServer.java

@@ -1024,7 +1024,7 @@ public final class CraftServer implements Server {
     }
 
     public void onPlayerJoin(Player player) {
-        if ((updater.isEnabled()) && (player.hasPermission(Server.BROADCAST_CHANNEL_ADMINISTRATIVE))) {
+        if ((updater.isEnabled()) && (updater.getCurrent() != null) && (player.hasPermission(Server.BROADCAST_CHANNEL_ADMINISTRATIVE))) {
             if ((updater.getCurrent().isBroken()) && (updater.getOnBroken().contains(updater.WARN_OPERATORS))) {
                 player.sendMessage(ChatColor.DARK_RED + "The version of CraftBukkit that this server is running is known to be broken. Please consider updating to the latest version at dl.bukkit.org.");
             } else if ((updater.isUpdateAvailable()) && (updater.getOnUpdate().contains(updater.WARN_OPERATORS))) {

src/main/java/org/bukkit/craftbukkit/updater/AutoUpdater.java

@@ -65,8 +65,8 @@ public class AutoUpdater {
         new Thread() {
             @Override
             public void run() {
-                current = service.getArtifact(currentSlug);
+                current = service.getArtifact(currentSlug, "current artifact information; perhaps you are running a custom version?");
-                latest = service.getArtifact("latest-" + channel);
+                latest = service.getArtifact("latest-" + channel, "latest artifact information");
 
                 if (isUpdateAvailable()) {
                     if ((current.isBroken()) && (onBroken.contains(WARN_CONSOLE))) {

src/main/java/org/bukkit/craftbukkit/updater/BukkitDLUpdaterService.java

@@ -1,15 +1,11 @@
 package org.bukkit.craftbukkit.updater;
 
 import com.google.gson.*;
-import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.UnsupportedEncodingException;
 import java.lang.reflect.Type;
-import java.net.MalformedURLException;
 import java.net.URL;
-import java.net.URLEncoder;
-import java.text.DateFormat;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.Date;
@@ -25,13 +21,13 @@ public class BukkitDLUpdaterService {
         this.host = host;
     }
 
-    public ArtifactDetails getArtifact(String slug) {
+    public ArtifactDetails getArtifact(String slug, String name) {
         try {
             return fetchArtifact(slug);
         } catch (UnsupportedEncodingException ex) {
-            Logger.getLogger(BukkitDLUpdaterService.class.getName()).log(Level.WARNING, "Could not get Artifact details for the auto-updater: " + ex.getClass().getSimpleName());
+            Logger.getLogger(BukkitDLUpdaterService.class.getName()).log(Level.WARNING, "Could not get " + name + ": " + ex.getClass().getSimpleName());
         } catch (IOException ex) {
-            Logger.getLogger(BukkitDLUpdaterService.class.getName()).log(Level.WARNING, "Could not get Artifact details for the auto-updater: " + ex.getClass().getSimpleName());
+            Logger.getLogger(BukkitDLUpdaterService.class.getName()).log(Level.WARNING, "Could not get " + name + ": " + ex.getClass().getSimpleName());
         }
 
         return null;