An agent object can invoke one or more methods of an application object using a helper object. The application object passes a reference to itself to the agent object. The agent object identifies a class loader of the application from the reference. The agent object obtains byte code of a helper class and uses the byte code of the helper class to creating a helper class loader. A parent of the helper class loader is set as the class loader of the application. The helper class loader is used to load the helper class and define an instance of the helper object. Using the helper object, the one or more methods of the application object are invoked by the agent using casting, without having a direct class loader connection with the class loader of the application.