Java通过Swing接收CORBA回调

我有一个扩展Swing JFrame的类。为了使该类接收回调并调用该类中的方法，该类应该扩展POA类。我不知道怎么做。多重继承呢？我应该创建另一个扩展POA类的类吗

代码

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如果您控制IDL，则不必扩展POA类：您可以通过RMI/IIOP定义回调，在生成存根（rmic-IIOP）时从远程接口生成IDL，并使用PortableRemoteObject.exportObject（）将其导出。不需要扩展任何特定的类

说了这么多，答案是错误的。JFrame扩展类不需要也是CORBA回调。将CORBA回调定义为一个完全独立的类，并在JFrame扩展类中提供钩子，以便在回调发生时执行所需的任何操作

public final class JFSECorbaClient extends javax.swing.JFrame {

//
// init and other method
//

public static void main(final String args[]) throws ClassNotFoundException, IllegalAccessException, InstantiationException{

        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                frame = new JFSECorbaClient().setVisible(true);
                try {

                    //initialize orb
                    Properties props = System.getProperties();
                    props.put("org.omg.CORBA.ORBInitialPort", "1050");
                    props.put("org.omg.CORBA.ORBInitialHost", "localhost");
                    ORB orb = ORB.init(args, props);
                    System.out.println("Initialized ORB");

                    //Instantiate Servant and create reference
                    POA rootPOA = POAHelper.narrow(
                            orb.resolve_initial_references("RootPOA"));
                    rootPOA.activate_object(this.frame); //this.frame should extends jfseCallbackPOA
                    ref = jfseCallbackHelper.narrow(
                            rootPOA.servant_to_reference(callbackListener));

                    //Resolve MessageServer
                    jfseServer = jfseORBHelper.narrow(
                            orb.string_to_object("corbaname:iiop:1.2@localhost:1050#MessageServer"));

                    //Activate rootpoa
                    rootPOA.the_POAManager().activate();
                    //thread for receive callback in other class thread
                    JFSECorrbaListener th = new JFSECorrbaListener();
                    th.setOrb(orb);
                    th.start();

                } catch (Exception e) {
                    System.out.println(e);
                }
            }
        });

    }