Java Corba不发送动态字符串数组

我想从Corba服务器向客户机发送一个动态字符串数组。它只适用于静态数组，但我需要从数据库中获取数据，这样就不能静态准备数据

IDL文件：

module ModData {
  typedef sequence<string> List;
  interface Data {
    List getData();
  };
};

第一个选项失败，原因如下：

com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl convertThrowableToSystemException
WARNING: "IOP00010202: (UNKNOWN) Unknown user exception thrown by the server" org.omg.CORBA.UNKNOWN:   vmcid: SUN  minor code: 202 completed: Maybe
at com.sun.corba.se.impl.logging.ORBUtilSystemException.runtimeexception(ORBUtilSystemException.java:8869)
at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.convertThrowableToSystemException(CorbaMessageMediatorImpl.java:1936)
at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleThrowableDuringServerDispatch(CorbaMessageMediatorImpl.java:1886)
at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleThrowableDuringServerDispatch(CorbaMessageMediatorImpl.java:1839)
at com.sun.corba.se.impl.protocol.CorbaServerRequestDispatcherImpl.dispatch(CorbaServerRequestDispatcherImpl.java:274)
at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleRequestRequest(CorbaMessageMediatorImpl.java:1700)
at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:1558)
at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleInput(CorbaMessageMediatorImpl.java:940)
at com.sun.corba.se.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(RequestMessage_1_2.java:198)
at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:712)
at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.dispatch(SocketOrChannelConnectionImpl.java:469)
at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.doWork(SocketOrChannelConnectionImpl.java:1230)
at com.sun.corba.se.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.performWork(ThreadPoolImpl.java:490)
at com.sun.corba.se.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:519)
Caused by: java.lang.NullPointerException
at ModAuthFIT.ListHelper.write(ListHelper.java:57)
at ModAuthFIT.AuthFITPOA._invoke(AuthFITPOA.java:75)
at com.sun.corba.se.impl.protocol.CorbaServerRequestDispatcherImpl.dispatchToServant(CorbaServerRequestDispatcherImpl.java:653)
at com.sun.corba.se.impl.protocol.CorbaServerRequestDispatcherImpl.dispatch(CorbaServerRequestDispatcherImpl.java:205)
    ... 9 more

---

你在用JacORB吗？我更喜欢JacORB而不是JDK。我认为这不是CORBA的错误，因为您得到了由java.lang.NullPointerException引起的

。在返回之前试着调试一下，看看你是否正确地得到了数据。我使用JDK，但我已经用一个很难看的方法解决了这个问题——我使用了JSON编码，并将数组作为一个简单的字符串传输。
com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl convertThrowableToSystemException
WARNING: "IOP00010202: (UNKNOWN) Unknown user exception thrown by the server" org.omg.CORBA.UNKNOWN:   vmcid: SUN  minor code: 202 completed: Maybe
at com.sun.corba.se.impl.logging.ORBUtilSystemException.runtimeexception(ORBUtilSystemException.java:8869)
at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.convertThrowableToSystemException(CorbaMessageMediatorImpl.java:1936)
at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleThrowableDuringServerDispatch(CorbaMessageMediatorImpl.java:1886)
at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleThrowableDuringServerDispatch(CorbaMessageMediatorImpl.java:1839)
at com.sun.corba.se.impl.protocol.CorbaServerRequestDispatcherImpl.dispatch(CorbaServerRequestDispatcherImpl.java:274)
at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleRequestRequest(CorbaMessageMediatorImpl.java:1700)
at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:1558)
at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleInput(CorbaMessageMediatorImpl.java:940)
at com.sun.corba.se.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(RequestMessage_1_2.java:198)
at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:712)
at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.dispatch(SocketOrChannelConnectionImpl.java:469)
at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.doWork(SocketOrChannelConnectionImpl.java:1230)
at com.sun.corba.se.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.performWork(ThreadPoolImpl.java:490)
at com.sun.corba.se.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:519)
Caused by: java.lang.NullPointerException
at ModAuthFIT.ListHelper.write(ListHelper.java:57)
at ModAuthFIT.AuthFITPOA._invoke(AuthFITPOA.java:75)
at com.sun.corba.se.impl.protocol.CorbaServerRequestDispatcherImpl.dispatchToServant(CorbaServerRequestDispatcherImpl.java:653)
at com.sun.corba.se.impl.protocol.CorbaServerRequestDispatcherImpl.dispatch(CorbaServerRequestDispatcherImpl.java:205)
    ... 9 more