code: public Object execute(String name, MethodMetaArgs methodMetaArgs, AppContextWrapper acw) throws Exception {
  		if ((methodMetaArgs == null) || (methodMetaArgs.getMethodName() == null)) {
  			Debug.logWarning(" methodMetaArgs is null. cann't invoke service.execute");
  		}
  		Debug.logVerbose("++++++++++++++++++++++++++++++<begin: invoking from jdonframework.xml", module);
  		Debug.logVerbose("+++++++++++++++execute new service='" + name + "' method='" + methodMetaArgs.getMethodName() + "'", module);
  		ContainerWrapper cw = containerCallback.getContainerWrapper();
  		TargetMetaDef targetMetaDef = userTargetMetaDefFactory.getTargetMetaDef(name, cw);
  		if (targetMetaDef == null)
  			return null;
  		Object result = execute(targetMetaDef, methodMetaArgs, acw);
  		Debug.logVerbose("+++++++++++++++execute service='" + name + "' method='" + methodMetaArgs.getMethodName() + "' successfully!", module);
  		Debug.logVerbose("++++++++++++++++++++++++++++++<end:", module);
  		return result;
  	}
docs: running the service, and return the result without session