SOS!! What's the matter about this exception

java.rmi.MarshalException: error marshalling return; nested exception is:
     java.io.NotSerializableException: java.util.RandomAccessSubList
     at weblogic.rjvm.BasicOutboundRequest.sendReceive(BasicOutboundRequest.java:108)
     at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:284)
     at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:244)
     at ejb.CategoryEJB_r6fvxc_EOImpl_812_WLStub.searchItems(Unknown Source)
     at test.ejb.TestCategoryEJBTestClient.testSearchItems(TestCategoryEJBTestClient.java:342)
...(Click for full stack trace)...
Caused by: java.io.NotSerializableException: java.util.RandomAccessSubList
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
     at java.util.HashMap.writeObject(HashMap.java:958)
     at sun.reflect.GeneratedMethodAccessor48.invoke(Unknown Source)
     at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:795)
     at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1294)
     at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1245)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
     at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1330)
     at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1302)
     at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1245)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
     at weblogic.common.internal.ChunkedObjectOutputStream.writeObject(ChunkedObjectOutputStream.java:116)
     at weblogic.rjvm.MsgAbbrevOutputStream.writeObject(MsgAbbrevOutputStream.java:93)
     at ejb.CategoryEJB_r6fvxc_EOImpl_WLSkel.invoke(Unknown Source)
     at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:477)
     at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java:108)
     at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:420)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:353)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:144)
     at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:415)
     at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:30)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)

my project is running on weblogic 8.1sp2, the code snap :
public Page implements Serialable{
    List list = new ArrayList;
    public Page(){
SearchSessionBean extends SessionBean {
    public Page search(Command cmd){
         //execute search
         listHandler.executeSearch(criteria);
         //construct the page
         page.setList(listHandler.getNextList());
         //***DEBUG:the <code>page</code> here is right
         return page.
}i test this method by junit , the code will return the right Page,but i deploy it to weblogic,the exception throws, why???????

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