Here is the treecache.xml again
-------------------------------------

<?xml version="1.0" encoding="UTF-8"?>





jboss:service=Naming
jboss:service=TransactionManager

org.jboss.cache.GenericTransactionManagerLookup
REPEATABLE_READ
REPL_ASYNC
true
0
0

true
MOD-Catalog
...
300000
300000

15000

sorry...

treecache.xml

<?xml version="1.0" encoding="UTF-8"?>

<server>
 <classpath codebase="./lib" archives="jboss-cache.jar, jgroups.jar"/>
 <mbean code="org.jboss.cache.TreeCache"
 name="jboss.cache:service=TreeCache">

 <depends>jboss:service=Naming</depends>
 <depends>jboss:service=TransactionManager</depends>

 <attribute name="TransactionManagerLookupClass">org.jboss.cache.GenericTransactionManagerLookup</attribute>
 <attribute name="IsolationLevel">REPEATABLE_READ</attribute>
 <attribute name="CacheMode">REPL_ASYNC</attribute>
 <attribute name="UseReplQueue">true</attribute>
 <attribute name="ReplQueueInterval">0</attribute>
 <attribute name="ReplQueueMaxElements">0</attribute>

 <attribute name="FetchStateOnStartup">true</attribute>
 <attribute name="ClusterName">MOD-Catalog</attribute>
 <attribute name="ClusterConfig">... </attribute>
 <attribute name="InitialStateRetrievalTimeout">300000</attribute>
 <attribute name="SyncReplTimeout">300000</attribute>

 <attribute name="LockAcquisitionTimeout">15000</attribute>
 </mbean>
</server>

Here is my hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
 "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
 "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
 <session-factory>
 <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
 <property name="connection.url">jdbc:oracle:thin:@db:1521:DB</property>
 <property name="connection.username">user</property>
 <property name="connection.password">pw</property>
 <property name="connection.pool_size">1</property>

 <property name="current_session_context_class">thread</property>

 <property name="dialect">org.hibernate.dialect.OracleDialect</property>

 <property name="show_sql">true</property>

 <property name="hibernate.cache.provider_class">org.hibernate.cache.TreeCacheProvider</property>

 <property name="hibernate.generate_statistics">true</property>
 <property name="hibernate.cache.use_structured_entries">true</property>
 <mapping resource="Category.hbm.xml"/>

 </session-factory>

</hibernate-configuration>

That was the problem. My cache usage was set to "read-write", not "transactional"

Thank you greatly for your help!!!!!!!

Brian