Mar 25, 2011 6:35:33 PM org.apache.catalina.ha.session.DeltaManager requestCompleted
SEVERE: Unable to serialize delta request for sessionid [F9D61003F2344ED314504FDE3BDF9FDA]
java.io.NotSerializableException: org.apache.catalina.realm.GenericPrincipal
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1180)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
        at java.util.LinkedList.writeObject(LinkedList.java:960)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:962)
        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)
        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
        at java.io.ObjectOutputStream.access$300(ObjectOutputStream.java:161)
        at java.io.ObjectOutputStream$PutFieldImpl.writeFields(ObjectOutputStream.java:1687)
        at java.io.ObjectOutputStream.writeFields(ObjectOutputStream.java:478)
        at javax.security.auth.Subject$SecureSet.writeObject(Subject.java:1300)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:962)
        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)
        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
        at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)
        at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:438)
        at java.util.Collections$SynchronizedCollection.writeObject(Collections.java:1618)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:962)
        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)
        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
        at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)
        at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:438)
        at javax.security.auth.Subject.writeObject(Subject.java:938)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:962)
        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)
        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
        at org.apache.catalina.ha.session.DeltaRequest$AttributeInfo.writeExternal(DeltaRequest.java:374)
        at org.apache.catalina.ha.session.DeltaRequest.writeExternal(DeltaRequest.java:272)
        at org.apache.catalina.ha.session.DeltaRequest.serialize(DeltaRequest.java:287)
        at org.apache.catalina.ha.session.DeltaManager.serializeDeltaRequest(DeltaManager.java:716)
        at org.apache.catalina.ha.session.DeltaManager.requestCompleted(DeltaManager.java:1224)
        at org.apache.catalina.ha.session.DeltaSession.expire(DeltaSession.java:403)
        at org.apache.catalina.ha.session.DeltaSession.isValid(DeltaSession.java:363)
        at org.apache.catalina.session.ManagerBase.processExpires(ManagerBase.java:712)
        at org.apache.catalina.session.ManagerBase.backgroundProcess(ManagerBase.java:697)
        at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1364)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1649)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1658)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1658)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1638)
        at java.lang.Thread.run(Thread.java:679)