code: public synchronized void setClassHandler(final OEntityManagerClassHandler iClassHandler) {
  		for (Entry<String, Class<?>> entry : classHandler.getClassesEntrySet()) {
  			iClassHandler.registerEntityClass(entry.getValue());
  		}
  		this.classHandler = iClassHandler;
  	}
docs: Sets the received handler as default and merges the classes all together.
  
  @param iClassHandler