Hello, I'm running a webapp on JBoss 4.0.5GA. It runs fine most of the time.

However -- and this happens almost every day -- there comes a moment when JBoss seems to go "out to lunch". Once this happens, the following is all I ever see when trying to use my webapp:

java.rmi.NoSuchObjectException: Could not activate; failed to restore state
|  at org.jboss.ejb.plugins.AbstractInstanceCache.get (AbstractInstanceCache.java:134)
|  at org.jboss.ejb.plugins.StatefulSessionInstanceInterceptor.invoke (StatefulSessionInstanceInterceptor.java:236)
|  at org.jboss.ejb.plugins.CallValidationInterceptor.invoke (CallValidationInterceptor.java:63)
|  at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext (AbstractTxInterceptor.java:121)
|  at org.jboss.ejb.plugins.TxInterce...

This of course gives the impression of extreme instability, since the only way I've found to fix this is to undeploy everything and restart JBoss.

How do I counteract this? Why is it happening? I need 100% uptime, and I'm not even really doing anything serious once this starts happening.

Any ideas appreciated,
John

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