myeclipse6.5下连接weblogic9出现java.io.StreamCorruptedException:invalid type code:31

myeclipse6.5下连接weblogic9.2时提示不能连接上weblogic。下面是我出现的错误：javax.naming.CommunicationException [Root exception is java.rmi.UnmarshalException: failed to unmarshal class weblogic.security.acl.internal.AuthenticatedUser; nested exception is: 
java.io.StreamCorruptedException: invalid type code: 31]
at weblogic.jndi.internal.ExceptionTranslator.toNamingException(ExceptionTranslator.java:85)
at weblogic.jndi.internal.ExceptionTranslator.toNamingException(ExceptionTranslator.java:41)
at weblogic.jndi.WLInitialContextFactoryDelegate.toNamingException(WLInitialContextFactoryDelegate.java:773)
at weblogic.jndi.WLInitialContextFactoryDelegate.pushSubject(WLInitialContextFactoryDelegate.java:673)
at weblogic.jndi.WLInitialContextFactoryDelegate.newContext(WLInitialContextFactoryDelegate.java:466)
at weblogic.jndi.WLInitialContextFactoryDelegate.getInitialContext(WLInitialContextFactoryDelegate.java:373)
at weblogic.jndi.Environment.getContext(Environment.java:307)
at weblogic.jndi.Environment.getContext(Environment.java:277)
at weblogic.jndi.WLInitialContextFactory.getInitialContext(WLInitialContextFactory.java:117)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:667)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288)
at javax.naming.InitialContext.init(InitialContext.java:223)
at javax.naming.InitialContext.<init>(InitialContext.java:197)
at edu.lzu.psrl.ejb.test.MolecularClient.getInitialContext(MolecularClient.java:80)
at edu.lzu.psrl.ejb.test.MolecularClient.main(MolecularClient.java:34)
Caused by: java.rmi.UnmarshalException: failed to unmarshal class weblogic.security.acl.internal.AuthenticatedUser; nested exception is: 
java.io.StreamCorruptedException: invalid type code: 31
at weblogic.rjvm.ResponseImpl.unmarshalReturn(ResponseImpl.java:223)
at weblogic.rmi.internal.BasicRemoteRef.invoke(BasicRemoteRef.java:224)
at weblogic.common.internal.RMIBootServiceImpl_923_WLStub.authenticate(Unknown Source)
at weblogic.security.acl.internal.Security$1.run(Security.java:185)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:363)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:147)
at weblogic.security.acl.internal.Security.authenticate(Security.java:181)
at weblogic.jndi.WLInitialContextFactoryDelegate.authenticateRemotely(WLInitialContextFactoryDelegate.java:734)
at weblogic.jndi.WLInitialContextFactoryDelegate.pushSubject(WLInitialContextFactoryDelegate.java:667)
... 11 more
Caused by: java.io.StreamCorruptedException: invalid type code: 31
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1356)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at weblogic.utils.io.ChunkedObjectInputStream.readObject(ChunkedObjectInputStream.java:195)
at weblogic.rjvm.MsgAbbrevInputStream.readObject(MsgAbbrevInputStream.java:565)
at weblogic.utils.io.ChunkedObjectInputStream.readObject(ChunkedObjectInputStream.java:191)
at weblogic.rmi.internal.ObjectIO.readObject(ObjectIO.java:62)
at weblogic.rjvm.ResponseImpl.unmarshalReturn(ResponseImpl.java:221)
... 19 more
Unable to connect to WebLogic server at t3://localhost:7001
Please make sure that the server is running.
java.lang.NullPointerException
at edu.lzu.psrl.ejb.test.MolecularClient.main(MolecularClient.java:35)
下面是我的连接程序：
private static Context getInitialContext() {
String url = "t3://localhost:7001";
    String user = "root";
    String password = "1qazxsw2";
    Properties properties = null;
    try {
      properties = new Properties();
      properties.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
      properties.put(Context.PROVIDER_URL, url);
      if (user != null) {
        properties.put(Context.SECURITY_PRINCIPAL, user);
        properties.put(Context.SECURITY_CREDENTIALS, password == null ? "" : password);
      }       return new InitialContext(properties);
}
    catch(Exception e) {
     e.printStackTrace();
      System.out.println("Unable to connect to WebLogic server at " + url);
      System.out.println("Please make sure that the server is running.");
    
    }
return null;
}请问为什么会连接不上weblogic那