What versions of JBoss and Seam are you trying to use? Do you still have the default-ds.xml file in the deploy directory? -if so where does it point to? Did you remove or modify a mbean configuration that looks something like this : | <!-- A persistence policy that persistes timers to a database --> | <mbean code="org.jboss.ejb.txtimer.DatabasePersistencePolicy" name="jboss.ejb:service=EJBTimerService,persistencePolicy=database"> | <!-- DataSource JNDI name --> | <depends optional-attribute-name="DataSource">jboss.jca:service=DataSourceBinding,name=DefaultDS</depends> | <!-- The plugin that handles database persistence --> | <attribute name="DatabasePersistencePlugin">org.jboss.ejb.txtimer.OracleDatabasePersistencePlugin</attribute> | </mbean> | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4114662#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...