Make sure that the class that u are importing from util package are
serializable.
sivakumar
> ----------
> From: Edward Barrett[SMTP:[EMAIL PROTECTED]]
> Reply To: A mailing list for Enterprise JavaBeans development
> Sent: Thursday, June 01, 2000 6:42 PM
> To: [EMAIL PROTECTED]
> Subject: Marshalling error in simple bean - please help
>
> I have a very simple Stateless session bean with a single method that
> returns an Enumeration (created from a Vector) of Serializable objects,
> yet I am getting a marshalling error.
>
> I'm new to this and suspect it is something very simple - help would be
> much appreciated.
>
> The remote interface is as follows:
>
> ---
> import javax.ejb.*;
> import java.rmi.RemoteException;
> import java.util.Enumeration;
> import java.util.Properties;
>
> public interface Test extends EJBObject
> {
> public Enumeration getResults(Properties criteria)
> throws RemoteException;
> }
> ----
>
> The implementation of the remote method is as follows:
>
> ----
> public Enumeration getResults(Properties criteria)
> {
> // HARD-CODED STUB
>
> Vector v = new Vector();
>
> v.addElement( new TestDetails(
> new Integer(1), "A","Low Cost Term",
> new Float(10.00) ) );
>
>
> v.addElement( new TestDetails(
> new Integer(2), "A","Portable Term",
> new Float(15.00) ) );
>
> v.addElement( new TestDetails(
> new Integer(3), "B","Low Start Term",
> new Float(20.00) ) );
>
> v.addElement( new TestDetails(
> new Integer(4), "C","Low Start Term",
> new Float(25.00) ) );
>
> return v.elements();
> }
> ----
>
> TestDetails is an 'attribute' class that implements Serializable.
>
> I have a test client with code as follows:
>
> ----
> // get context
>
> System.out.println("Obtaining initial context ...");
>
> Properties p = new Properties();
> p.put(Context.INITIAL_CONTEXT_FACTORY,
> "weblogic.jndi.WLInitialContextFactory");
> InitialContext ctx = new InitialContext(p);
>
> System.out.println("... SUCCESS.");
>
> // locate object
>
> System.out.println("Locating Home ...");
>
> TestHome home = (TestHome) ctx.lookup("TestHome");
>
> System.out.println("... SUCCESS.");
>
> // create an object
>
> System.out.println("Creating bean ...");
>
> Test bean = home.create();
>
> System.out.println("... SUCCESS.");
>
> // run method
>
> System.out.println("Running method ...");
>
> Enumeration results = bean.getResults(new Properties());
>
> System.out.println("... SUCCESS.");
>
> // clear up
>
> bean.remove();
> ctx.close();
>
> ----
>
> The test fails at the bean.getResults() method with the following error
>
> ----
> java.rmi.RemoteException: ; nested exception is:
> weblogic.rmi.ServerException: A remote exception occurred while
> executing the method on the remote object
> - with nested exception:
> [weblogic.rmi.MarshalException: error marshalling return
> - with nested exception:
> [java.io.IOException: Class java.util.Vector$1 with code=123 does not
> implement Serializable, Externalizable or WLSerializable]]
> java.io.IOException: Class java.util.Vector$1 with code=123 does not
> implement Serializable, Externalizable or WLSerializable
> at
> weblogic.common.internal.WLObjectOutputStreamBase.writeObjectBody(WLObject
> OutputStreamBase.java:895)
> at
> weblogic.common.internal.WLObjectOutputStreamBase.writeObject(WLObjectOutp
> utStreamBase.java, Compiled Code)
> at
> weblogic.common.internal.WLObjectOutputStreamBase.writeObjectWL(WLObjectOu
> tputStreamBase.java, Compiled Code)
> at
> weblogic.rmi.extensions.AbstractOutputStream2.writeObject(AbstractOutputSt
> ream2.java:82)
> at TestBeanEOImpl_WLSkel.invoke(TestBeanEOImpl_WLSkel.java:137)
> at
> weblogic.rmi.extensions.BasicServerObjectAdapter.invoke(BasicServerObjectA
> dapter.java, Compiled Code)
> at
> weblogic.rmi.extensions.BasicRequestHandler.handleRequest(BasicRequestHand
> ler.java:69)
> at
> weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java
> :15)
> at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled
> Code)
> --------------- nested within: ------------------
> weblogic.rmi.MarshalException: error marshalling return
> - with nested exception:
> [java.io.IOException: Class java.util.Vector$1 with code=123 does not
> implement Serializable, Externalizable or WLSerializable]
> at TestBeanEOImpl_WLSkel.invoke(TestBeanEOImpl_WLSkel.java:139)
> at
> weblogic.rmi.extensions.BasicServerObjectAdapter.invoke(BasicServerObjectA
> dapter.java, Compiled Code)
> at
> weblogic.rmi.extensions.BasicRequestHandler.handleRequest(BasicRequestHand
> ler.java:69)
> at
> weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java
> :15)
> at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled
> Code)
> --------------- nested within: ------------------
> weblogic.rmi.ServerException: A remote exception occurred while executing
> the method on the remote object
> - with nested exception:
> [weblogic.rmi.MarshalException: error marshalling return
> - with nested exception:
> [java.io.IOException: Class java.util.Vector$1 with code=123 does not
> implement Serializable, Externalizable or WLSerializable]]
> at weblogic.rmi.extensions.AbstractRequest.sendReceive(Compiled
> Code)
> at
> TestBeanEOImpl_WLStub.getResults(TestBeanEOImpl_WLStub.java:368)
> at
> TestBeanEOImpl_ServiceStub.getResults(TestBeanEOImpl_ServiceStub.java:253)
> at Client.runTest(Client.java:49)
> at Client.main(Client.java:81)
> Exception in thread "main"
> ----
>
> the environment is WindowsNT4.0, WLS5.1 and Java2.
>
> I'm sure it is something simple and therefore any help would be extremely
> appreciated.
>
> regards
>
> Ed
>
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