Some changes after running Findbugs.

src/main/java/org/dynmap/DynmapPlugin.java

@@ -1,8 +1,8 @@
 package org.dynmap;
 
 import java.io.File;
-import java.io.FileOutputStream;
 import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.lang.reflect.Constructor;
 import java.net.InetAddress;
@@ -10,12 +10,12 @@ import java.net.UnknownHostException;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
-import java.util.logging.Logger;
 import java.util.Timer;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import org.bukkit.Location;
 import org.bukkit.World;
-import org.bukkit.block.Block;
 import org.bukkit.block.BlockDamageLevel;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
@@ -39,12 +39,12 @@ import org.dynmap.Event.Listener;
 import org.dynmap.debug.Debug;
 import org.dynmap.debug.Debugger;
 import org.dynmap.web.HttpServer;
+import org.dynmap.web.Json;
 import org.dynmap.web.handlers.ClientConfigurationHandler;
 import org.dynmap.web.handlers.ClientUpdateHandler;
 import org.dynmap.web.handlers.FilesystemHandler;
 import org.dynmap.web.handlers.SendMessageHandler;
 import org.dynmap.web.handlers.SendMessageHandler.Message;
-import org.dynmap.web.Json;
 
 public class DynmapPlugin extends JavaPlugin {
 
@@ -79,7 +79,9 @@ public class DynmapPlugin extends JavaPlugin {
         loadDebuggers();
 
         tilesDirectory = getFile(configuration.getString("tilespath", "web/tiles"));
-        tilesDirectory.mkdirs();
+        if (!tilesDirectory.isDirectory() && !tilesDirectory.mkdirs()) {
+            log.warning("Could not create directory for tiles ('" + tilesDirectory + "').");
+        }
 
         playerList = new PlayerList(getServer(), getFile("hiddenplayers.txt"));
         playerList.load();
@@ -351,9 +353,9 @@ public class DynmapPlugin extends JavaPlugin {
             fos.write(Json.stringifyJson(clientConfig).getBytes());
             fos.close();
         } catch (FileNotFoundException ex) {
-            System.out.println("FileNotFoundException : " + ex);
+            log.log(Level.SEVERE, "Exception while writing JSON-configuration-file.", ex);
         } catch (IOException ioe) {
-            System.out.println("IOException : " + ioe);
+            log.log(Level.SEVERE, "Exception while writing JSON-configuration-file.", ioe);
         }
     }
 }

src/main/java/org/dynmap/JsonTimerTask.java

@@ -5,6 +5,8 @@ import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.util.TimerTask;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import org.bukkit.Location;
 import org.bukkit.Server;
@@ -14,6 +16,8 @@ import org.bukkit.util.config.Configuration;
 import org.dynmap.web.Json;
 
 class JsonTimerTask extends TimerTask {
+    protected static final Logger log = Logger.getLogger("Minecraft");
+    
     private final DynmapPlugin plugin;
     private Server server;
     private MapManager mapManager;
@@ -57,9 +61,9 @@ class JsonTimerTask extends TimerTask {
                 fos.write(Json.stringifyJson(update).getBytes());
                 fos.close();
             } catch (FileNotFoundException ex) {
-                System.out.println("FileNotFoundException : " + ex);
+                log.log(Level.SEVERE, "Exception while writing JSON-file.", ex);
             } catch (IOException ioe) {
-                System.out.println("IOException : " + ioe);
+                log.log(Level.SEVERE, "Exception while writing JSON-file.", ioe);
             }
         }
     }

src/main/java/org/dynmap/MapManager.java

@@ -107,7 +107,6 @@ public class MapManager {
                     }
                 }
                 found.remove(tile);
-                System.gc();
             }
 
             // Unload remaining chunks to clean-up.
@@ -202,7 +201,9 @@ public class MapManager {
             worldTileDirectory = new File(DynmapPlugin.tilesDirectory, tile.getWorld().getName());
             worldTileDirectories.put(world, worldTileDirectory);
         }
-        worldTileDirectory.mkdirs();
+        if (!worldTileDirectory.isDirectory() && !worldTileDirectory.mkdirs()) {
+            log.warning("Could not create directory for tiles ('" + worldTileDirectory + "').");
+        }
         return new File(worldTileDirectory, tile.getFilename()); 
     }
 

src/main/java/org/dynmap/UpdateQueue.java

@@ -58,7 +58,7 @@ public class UpdateQueue {
         return updates;
     }
 
-    public class Update {
+    public static class Update {
         public long time;
         public Object obj;
 

src/main/java/org/dynmap/flat/FlatMap.java

@@ -97,7 +97,7 @@ public class FlatMap extends MapType {
         return rendered;
     }
 
-    public class FlatMapTile extends MapTile {
+    public static class FlatMapTile extends MapTile {
 
         public int x;
         public int y;

src/main/java/org/dynmap/kzedmap/KzedMap.java

@@ -3,6 +3,7 @@ package org.dynmap.kzedmap;
 import java.awt.Color;
 import java.io.File;
 import java.io.FileInputStream;
+import java.io.FileNotFoundException;
 import java.io.InputStream;
 import java.lang.reflect.Constructor;
 import java.util.ArrayList;
@@ -10,6 +11,7 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Scanner;
+import java.util.logging.Level;
 import java.util.logging.Logger;
 
 import org.bukkit.Location;
@@ -267,9 +269,11 @@ public class KzedMap extends MapType {
                 nc += 1;
             }
             scanner.close();
-        } catch (Exception e) {
+        } catch (RuntimeException e) {
-            Debug.error("Could not load colors", e);
+            log.log(Level.SEVERE, "Could not load colors", e);
             return null;
+        } catch (FileNotFoundException e) {
+            log.log(Level.SEVERE, "Could not load colors: file not found", e);
         }
         return colors;
     }

src/main/java/org/dynmap/web/HttpServerConnection.java

@@ -115,6 +115,8 @@ public class HttpServerConnection extends Thread {
 
     public void run() {
         try {
+            if (socket == null)
+                return;
             socket.setSoTimeout(5000);
             InputStream in = socket.getInputStream();
             BufferedOutputStream out = new BufferedOutputStream(socket.getOutputStream(), 40960);
@@ -178,8 +180,10 @@ public class HttpServerConnection extends Thread {
                     return;
                 }
 
-                if (bound > 0) {
+                if (bound > 0 && boundBody.skip(bound) < bound) {
-                    boundBody.skip(bound);
+                    Debug.debug("Incoming stream was only read partially by handler '" + handler + "'.");
+                    //socket.close();
+                    //return;
                 }
                 
                 String connection = response.fields.get("Connection");

src/main/java/org/dynmap/web/Json.java

@@ -3,8 +3,10 @@ package org.dynmap.web;
 import java.lang.reflect.Array;
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
+import java.security.KeyStore.Entry;
 import java.util.LinkedHashMap;
 import java.util.List;
+import java.util.Map;
 
 public class Json {
     public static String stringifyJson(Object o) {
@@ -26,15 +28,15 @@ public class Json {
             LinkedHashMap<?, ?> m = (LinkedHashMap<?, ?>) o;
             s.append("{");
             boolean first = true;
-            for (Object key : m.keySet()) {
+            for (Map.Entry<?, ?> entry : m.entrySet()) {
                 if (first)
                     first = false;
                 else
                     s.append(",");
 
-                appendJson(key, s);
+                appendJson(entry.getKey(), s);
                 s.append(": ");
-                appendJson(m.get(key), s);
+                appendJson(entry.getValue(), s);
             }
             s.append("}");
         } else if (o instanceof List<?>) {

src/main/java/org/dynmap/web/handlers/ClientUpdateHandler.java

@@ -30,7 +30,7 @@ public class ClientUpdateHandler implements HttpHandler {
         this.server = server;
     }
 
-    Pattern updatePathPattern = Pattern.compile("world/([a-zA-Z0-9_-\\.]+)/([0-9]*)");
+    Pattern updatePathPattern = Pattern.compile("world/([a-zA-Z0-9_\\-\\.]+)/([0-9]*)");
     private static final HttpStatus WorldNotFound = new HttpStatus(HttpStatus.NotFound.getCode(), "World Not Found"); 
     @Override
     public void handle(String path, HttpRequest request, HttpResponse response) throws Exception {

src/main/java/org/dynmap/web/handlers/SendMessageHandler.java

@@ -39,7 +39,7 @@ public class SendMessageHandler implements HttpHandler {
         response.status = HttpStatus.OK;
         response.getBody();
     }
-    public class Message {
+    public static class Message {
         public String name;
         public String message;
     }