Switch MCPC+ to using unloadChunkRequest - unloadChunk() seems to not clean up properly

src/main/java/org/dynmap/bukkit/BukkitVersionHelper.java

@@ -106,4 +106,8 @@ public abstract class BukkitVersionHelper {
      * Get field value from NBT compound
      */
     public abstract Object getFieldValue(Object nbt, String field);
+    /**
+     * Unload chunk no save needed
+     */
+    public abstract void unloadChunkNoSave(World w, int cx, int cz);
 }

src/main/java/org/dynmap/bukkit/BukkitVersionHelperBukkitForge.java

@@ -95,5 +95,8 @@ public class BukkitVersionHelperBukkitForge extends BukkitVersionHelperGeneric {
         }
         return true;
     }
-
+    @Override
+    public void unloadChunkNoSave(World w, int cx, int cz) {
+        w.unloadChunkRequest(cx, cz);
+    }
 }

src/main/java/org/dynmap/bukkit/BukkitVersionHelperCB.java

@@ -93,4 +93,9 @@ public class BukkitVersionHelperCB extends BukkitVersionHelperGeneric {
         nmst_y = getField(nms_tileentity, new String[] { "y" }, int.class); 
         nmst_z = getField(nms_tileentity, new String[] { "z" }, int.class); 
     }
+    @Override
+    public void unloadChunkNoSave(World w, int cx, int cz) {
+        w.unloadChunk(cx, cz, false, false);
+    }
+
 }

src/main/java/org/dynmap/bukkit/BukkitVersionHelperMCPC.java

@@ -88,4 +88,8 @@ public class BukkitVersionHelperMCPC extends BukkitVersionHelperGeneric {
         nmst_y = getField(nms_tileentity, new String[] { "m" }, int.class);
         nmst_z = getField(nms_tileentity, new String[] { "n" }, int.class);
     }
+    @Override
+    public void unloadChunkNoSave(World w, int cx, int cz) {
+        w.unloadChunkRequest(cx, cz);
+    }
 }

src/main/java/org/dynmap/bukkit/NewMapChunkCache.java

@@ -944,7 +944,7 @@ public class NewMapChunkCache implements MapChunkCache {
                      * while the actual in-use chunk area for a player where the chunks are managed
                      * by the MC base server is 21x21 (or about a 160 block radius).
                      * Also, if we did generate it, need to save it */
-                    w.unloadChunk(chunk.x, chunk.z, false, false);
+                    helper.unloadChunkNoSave(w, chunk.x, chunk.z);
                 }
                 else if (isunloadpending) { /* Else, if loaded and unload is pending */
                     w.unloadChunkRequest(chunk.x, chunk.z); /* Request new unload */