为什么通过session调用entitybean中的find会发生如下问题

Question

weblogic.utils.AssertionError: ***** ASSERTION FAILED *****[ Environment can never be null ] at weblogic.rmi.cluster.EntityRemoteRef.readExternal(EntityRemoteRef.java:175) at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1212) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386) at java.io.ObjectInputStream.inputClassFields(ObjectInputStream.java:2263) at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:519) at weblogic.rmi.internal.StubInfo.readObject(StubInfo.java:73) at java.lang.reflect.Method.invoke(Native Method) at java.io.ObjectInputStream.invokeObjectReader(ObjectInputStream.java:2214) at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1411) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236) at java.util.ArrayList.readObject(ArrayList.java:531) at java.lang.reflect.Method.invoke(Native Method) at java.io.ObjectInputStream.invokeObjectReader(ObjectInputStream.java:2214)

Answer 1

t java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1411)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236)
at weblogic.common.internal.ChunkedObjectInputStream.readObject(ChunkedObjectInputStream.java:107)
at weblogic.common.internal.ChunkedObjectInputStream.readObject(ChunkedObjectInputStream.java:115)
at weblogic.rmi.internal.ObjectIO.readObject(ObjectIO.java:56)
at weblogic.rmi.internal.BasicRemoteRef.unmarshalReturn(BasicRemoteRef.java:230)
at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:254)
at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:220)

Answer 2

at weblogic.rmi.internal.ProxyStub.invoke(ProxyStub.java:35)
at $Proxy2.userFind(Unknown Source)
at manage.UserSessionTestClient2.userFind(UserSessionTestClient2.java:282)
at manage.UserSessionTestClient2.main(UserSessionTestClient2.java:323)
weblogic.utils.AssertionError: ***** ASSERTION FAILED *****[ Environment can never be null ]
at weblogic.rmi.cluster.EntityRemoteRef.readExternal(EntityRemoteRef.java:175)
at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1212)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386)