Answer to myself (we need an edit function): No, even changing the persistence-names will not fix the issue. Here is the content of one persistence.xml (besides the different persistence-names they are all the same). | <persistence | xmlns="http://java.sun.com/xml/ns/persistence" | xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" | version="1.0"> | | <persistence-unit name="user-management"> | <!-- use the JNDI name here!! --> | <jta-data-source>java:/FruitDS</jta-data-source> | <mapping-file>META-INF/orm.xml</mapping-file> | <properties> | <property name="hibernate.hbm2ddl.auto" value="create-drop"/> | | <property name="hibernate.cache.use_query_cache" value="true"/> | <property name="hibernate.cache.provider_class" value="org.jboss.ejb3.entity.TreeCacheProviderHook" /> | <property name="hibernate.treecache.mbean.object_name" value="jboss.cache:service=EJB3EntityTreeCache" /> | | </properties> | </persistence-unit> | </persistence> | and the matching orm.xml: | <?xml version="1.0" encoding="UTF-8"?> | <entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm" | xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm orm_1_0.xsd" | version="1.0"> | <persistence-unit-metadata> | <persistence-unit-defaults> | <schema>public</schema> | </persistence-unit-defaults> | </persistence-unit-metadata> | | <entity class="my.test.dom.Action"> | <table name="actions"/> | <attributes> | <id name="id"> | <column name="ID"/> | <generated-value/> | </id> | <basic name="userId"> | <column name="user_id"/> | </basic> | <basic name="method"> | <column name="method"/> | </basic> | </attributes> | </entity> | | <entity class="my.test.dom.User"> | <table name="users"/> | <attributes> | <id name="id"> | <column name="ID"/> | <generated-value/> | </id> | <basic name="name"> | <column name="NAME"/> | </basic> | </attributes> | </entity> | | </entity-mappings> | View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4210615#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...