Stateful session bean "Could not passivate"

Jeg får denne fejl i JBoss, som jeg ikke forstår. Den kommer efter en 10 minutters tid.


15:02:24,781 WARN [AbstractInstanceCache] failed to passivate, id=e92p5p91-j
javax.ejb.EJBException: Could not passivate; failed to save state; CausedByExcep
tion is:
org.jboss.mq.SpyQueueSender
at org.jboss.ejb.plugins.StatefulSessionFilePersistenceManager.passivate
Session(StatefulSessionFilePersistenceManager.java:404)
at org.jboss.ejb.plugins.StatefulSessionInstanceCache.passivate(Stateful
SessionInstanceCache.java:93)
at org.jboss.ejb.plugins.AbstractInstanceCache.tryToPassivate(AbstractIn
stanceCache.java:180)
at org.jboss.ejb.plugins.LRUEnterpriseContextCachePolicy$OveragerTask.ru
n(LRUEnterpriseContextCachePolicy.java:419)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
java.io.NotSerializableException: org.jboss.mq.SpyQueueSender
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1075)

at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java
:1369)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:13
41)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.jav
a:1284)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1073)

at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:291)
at org.jboss.ejb.plugins.StatefulSessionFilePersistenceManager.passivate
Session(StatefulSessionFilePersistenceManager.java:395)
at org.jboss.ejb.plugins.StatefulSessionInstanceCache.passivate(Stateful
SessionInstanceCache.java:93)
at org.jboss.ejb.plugins.AbstractInstanceCache.tryToPassivate(AbstractIn
stanceCache.java:180)
at org.jboss.ejb.plugins.LRUEnterpriseContextCachePolicy$OveragerTask.ru
n(LRUEnterpriseContextCachePolicy.java:419)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)