We have a middleware application that publishes web services using Axis, and also accesses database using Hibernate and JMS. spring is used as teh underlying framework

The application is deployed on WebSphere Application Server 5.1, and at runtime after a few transactions, results in Out Of Memory exception. The logs have been sent to IBM for analysis, and after numerous tweaks and configurations, it was apparent that the that the org/hibernate/impl/SessionFactoryObjectFactory uses about
956MB of JVM heap memory.

If possible could you perhaps advice as to what causes the SessionFactoryObjectFactory to hold that much of memory ?

Hi,
a guess.......!
clear the session often.

With time, it is very likely for Hibernate Session to get bloated with persistent objects.
This is one of the common reasons for out of memory exceptions.

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