Hi! According to ejb-3.0 spec (page 88) in @PreDestroy method in stateless bean only following method are allowed: - SessionContext methods: getBusinessObject, getEJBHome, getEJBLocalHome, getEJBObject, getEJBLocalObject,getTimerService, lookup - JNDI access to java:comp/env - EntityManagerFactory access as you see 'TimerService and Timer methods' are not mentioned here, so you cannot cancel timer in PreDestroy method. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4216466#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...