"gavin king" wrote : You _will_ need a hibernate.cfg.xml, of course! Will I? But ... until now, I never needed one. persistence.xml was all I had. Ok, when I create one, will I only have to put this session-factory entry into it? Or will I have to move configuration parameters from persistence.xml into hibernate.cfg.xml? persistence.xml: | <?xml version="1.0" encoding="UTF-8"?> | | <persistence> | <persistence-unit name="LeistungserfassungEntityManager"> | <jta-data-source>java:/LeistungserfassungDS</jta-data-source> | <properties> | <property name="hibernate.hbm2ddl.auto" value=""/> | <property name="hibernate.show_sql" value="true"/> | <property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect" /> | <property name="hibernate.max_fetch_depth" value="0" /> | <property name="hibernate.default_batch_fetch_size" value="100" /> | <property name="hibernate.use_sql_comments" value="true" /> | <property name="hibernate.bytecode.use_reflection_optimizer" value="false" /> | </properties> | </persistence-unit> | </persistence> | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3961292#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...