Corrected spelling mistake.

jme3-core/src/main/java/com/jme3/scene/BatchNode.java

@@ -116,7 +116,7 @@ public class BatchNode extends GeometryGroupNode {
     }
 
     @Override
-    public void onGeoemtryUnassociated(Geometry geom) {
+    public void onGeometryUnassociated(Geometry geom) {
         setNeedsFullRebatch(true);
     }
 

jme3-core/src/main/java/com/jme3/scene/Geometry.java

@@ -344,7 +344,7 @@ public class Geometry extends Spatial {
         if (groupNode != null) {
             // Once the geometry is removed 
             // from the parent, the group node needs to be updated.
-            groupNode.onGeoemtryUnassociated(this);
+            groupNode.onGeometryUnassociated(this);
             groupNode = null;
             
             // change the default to -1 to make error detection easier

jme3-core/src/main/java/com/jme3/scene/GeometryGroupNode.java

@@ -83,5 +83,5 @@ public abstract class GeometryGroupNode extends Node {
      * 
      * @param geom The Geometry which is being unassociated.
      */
-    public abstract void onGeoemtryUnassociated(Geometry geom);
+    public abstract void onGeometryUnassociated(Geometry geom);
 }

jme3-core/src/main/java/com/jme3/scene/instancing/InstancedNode.java

@@ -329,7 +329,7 @@ public class InstancedNode extends GeometryGroupNode {
     }
 
     @Override
-    public void onGeoemtryUnassociated(Geometry geom) {
+    public void onGeometryUnassociated(Geometry geom) {
         removeFromInstancedGeometry(geom);
     }
 }