Hi, it seems to me that there is a lot of confusion in the default value of the transaction-type attribute of the persistence-unit tag in the persistence.xml file. What is the default value of this file ? JTA or RESOURCE_LOCAL ? Does it depend on the environment : Java SE or JAVA EE ? That is what this documentation for Apache Geronimo states : http://cwiki.apache.org/GMOxDOC21/persistencexml.html anonymous wrote : | In general, in Java EE environments, a transaction-type of RESOURCE_LOCAL assumes that a non-JTA datasource will be provided. In a Java EE environment, if this element is not specified, the default is JTA. In a Java SE environment, if this element is not specified, a default of RESOURCE_LOCAL may be assumed. | What is the behaviour of that attribute in JBoss 5.1.0 GA ? Thanks for enlightening me and other people i am sure. Celinio Fernandes View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4268345#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...