Could not passivate; failed to save state

[ricardomarques]

Hi guys

I'm using ejb with a web application on jboss 4.0.5 with jdk 1.5 and i'm getting this exception:

11:53:50,390 WARN [AbstractInstanceCache] failed to passivate, id=f373o8gy-s
javax.ejb.EJBException: Could not passivate; failed to save state
 at org.jboss.ejb.plugins.StatefulSessionFilePersistenceManager.passivateSession(StatefulSessionFilePersistenceManager.java:423)
 at org.jboss.ejb.plugins.StatefulSessionInstanceCache.passivate(StatefulSessionInstanceCache.java:107)
 at org.jboss.ejb.plugins.AbstractInstanceCache.tryToPassivate(AbstractInstanceCache.java:209)
 at org.jboss.ejb.plugins.AbstractInstanceCache.tryToPassivate(AbstractInstanceCache.java:162)
 at org.jboss.ejb.plugins.LRUEnterpriseContextCachePolicy$OveragerTask.run(LRUEnterpriseContextCachePolicy.java:450)
 at java.util.TimerThread.mainLoop(Timer.java:512)
 at java.util.TimerThread.run(Timer.java:462)
Caused by: java.io.NotSerializableException: java.lang.ThreadLocal
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1081)
 at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
 at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
 at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
 at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
 at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
 at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)
 at org.jboss.ejb.plugins.StatefulSessionFilePersistenceManager.passivateSession(StatefulSessionFilePersistenceManager.java:414)
 ... 6 more

My code (Session bean statefull):

protected transient Log log;
private transient IdentitySession identitySession;

public void ejbPassivate() throws EJBException, RemoteException {
 log.debug("bean passivating... ");
 log = null;
 identitySession.close();
 identitySession = null;
 }

the attributes are transient because i had read somewhere that like that i could avoid serialization problems. but they remain, i've tried with and without them and the output is the same.

IdentitySession is a non-serializable object and Log is a interface from commons logging also non-serializable.

can anyone help?