I looked at the JMX console and determined that the DefaultDS was being used (HSQLDB). Also, GeneralPurposeDatabasePersistencePlugin class indicates that a table named TIMERS is being created and timer scheduling instances are being inserted into that table. I deleted all the records and the errors during startup of JBoss went away. However, this does not address/identify the root cause of the errors... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4132275#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...