Revert "Remove duplicate removeEntities - Fixes #1838"

This reverts commit 6e4ec3eeb8.

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

@@ -88,6 +88,10 @@ public abstract class BukkitVersionHelper {
      * Test if normal chunk snapshot
      */
 //    public abstract boolean isCraftChunkSnapshot(ChunkSnapshot css);
+    /** 
+     * Remove entities from given chunk
+     */
+    public abstract void removeEntitiesFromChunk(Chunk c);
     /**
      * Get inhabited ticks count from chunk
      */

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

@@ -102,6 +102,7 @@ public class BukkitVersionHelperCB extends BukkitVersionHelperGeneric {
         }
         /** n.m.s.Chunk */
         nmschunk = getNMSClass("net.minecraft.server.Chunk");
+        nmsc_removeentities = getMethod(nmschunk, new String[] { "removeEntities" }, nulltypes);
         nmsc_tileentities = getField(nmschunk, new String[] { "tileEntities" }, Map.class);
         nmsc_inhabitedticks = getFieldNoFail(nmschunk, new String[] { "s", "q", "u", "v" }, long.class);
         if (nmsc_inhabitedticks == null) {
@@ -156,6 +157,7 @@ public class BukkitVersionHelperCB extends BukkitVersionHelperGeneric {
     }
     @Override
     public void unloadChunkNoSave(World w, Chunk c, int cx, int cz) {
+        this.removeEntitiesFromChunk(c);
         w.unloadChunk(cx, cz, false, false);
     }
     /**

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

@@ -54,6 +54,7 @@ public abstract class BukkitVersionHelperGeneric extends BukkitVersionHelper {
     protected Method lhs_containskey;
     /** n.m.s.Chunk */
     protected Class<?> nmschunk;
+    protected Method nmsc_removeentities;
     protected Field nmsc_tileentities;
     protected Field nmsc_inhabitedticks;
     /** nbt classes */
@@ -335,7 +336,13 @@ public abstract class BukkitVersionHelperGeneric extends BukkitVersionHelper {
 //        }
 //        return false;
 //    }
-
+    /** Remove entities from given chunk */
+    public void removeEntitiesFromChunk(Chunk c) {
+        Object omsc = callMethod(c, cc_gethandle, nullargs, null);
+        if(omsc != null) {
+            callMethod(omsc, nmsc_removeentities, nullargs, null);
+        }
+    }
     /**
      * Get inhabited ticks count from chunk
      */

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

@@ -91,6 +91,12 @@ public class BukkitVersionHelperGlowstone extends BukkitVersionHelper {
         return b;
     }
 
+    @Override
+    public void removeEntitiesFromChunk(Chunk c) {
+        // TODO Auto-generated method stub
+
+    }
+
     @Override
     public long getInhabitedTicks(Chunk c) {
         // TODO Auto-generated method stub