Hello,

We just started using Hibernate 2.1.2 with JBoss 3.2.3RC1 and seem to be having a memory leak (also using Oracle 9.2). We have a client application that reads about 2000 objects (the object is read-only mapping) one at a time from the server. If I put this client application into a loop that runs every 30 seconds, we run out of heap memory within the server after a couple of hours (we have it max VM size at 1.5G, and the object isn't that large). We have tried both net.sf.hibernate.cache.TreeCacheProvider and ehcache with the same results.

We have session bean that basically performs the following steps:

1) Creates a Session.
2) Performs the query.
3) Closes the Session.

We are assuming the JBoss container is controllering the transaction (but this is a reading operation of a read-only bean). Are we required to do anything other than openning/closing a Hibernate session within the JBoss container? We have to be missing something to have a memory leak this bad.

We are using the Hibernate Service MBean as the documentation states, here is the declaration within our jboss-service.xml file.

<mbean code="net.sf.hibernate.jmx.HibernateService" name="jboss.jca:service=Hibernate-ScorDS">
<depends>jboss.jca:service=RARDeployer</depends>
<depends>jboss.jca:service=LocalTxCM,name=jdbc/ScorDS</depends>

<attribute name="CacheProvider">net.sf.hibernate.cache.TreeCacheProvider</attribute>

<!--
<attribute name="CacheProvider">net.sf.ehcache.hibernate.Provider</attribute>
-->

<attribute name="UseQueryCache">true</attribute>
<attribute name="MapResources">
&referenceservice-resources;,
&securitiesservice-resources;
</attribute>
<attribute name="JndiName">java:/hibernate/ScorDS</attribute>
<attribute name="Datasource">java:/jdbc/ScorDS</attribute>
<attribute name="Dialect">net.sf.hibernate.dialect.Oracle9Dialect</attribute>
<attribute name="UseOuterJoin">true</attribute>
<attribute name="ShowSql">false</attribute>
<attribute name="UserTransactionName">UserTransaction</attribute>
<attribute name="TransactionStrategy">net.sf.hibernate.transaction.JTATransactionFactory</attribute>
<attribute name="TransactionManagerLookupStrategy">net.sf.hibernate.transaction.JBossTransactionManagerLookup</attribute>
</mbean>


Any help would be appreciated. Thanks in advance,

Rich