@Override
        public DummyData clone(){
            try {
                DummyData clone = (DummyData) super.clone();
                clone.data = data.clone();
                return clone;
            } catch (CloneNotSupportedException ex) {
                throw new AssertionError();
            }
        }
Dummy data is an asset having 10 KB to put a dent in the garbage collector
jme3-examples/src/main/java/jme3test/asset/TestAssetCache.java