anonymous wrote : I use a local-tx-datasource MySQL JDBC datasource Are you sure the tables that you have created in MySQL, support transactions? MySQL comes in two flavours - one with transaction engine and one without it. I guess by default (MyISAM engine) transactions are not supported. You need to use INNODB engine in MySQL. See this for details http://dev.mysql.com/doc/refman/5.1/en/storage-engines.html View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4233483#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...