You mention that your ejb-jar.xml contains: <ejb-jar> | <description>HearerMDB</description> | <display-name>HearerMDB</display-name> | <enterprise-beans> | <message-driven> | <ejb-name>HearerMDB</ejb-name> | <ejb-class>com.hearer.Hearer</ejb-class> | <message-destination-type>javax.jms.Queue</message-destination-type> | <activation-config> | <activation-config-property> | <activation-config-property-name>MaxPoolSize</activation-config-property-name> | <activation-config-property-value>6</activation-config-property-value> | </activation-config-property> | <activation-config-property> | <activation-config-property-name>providerAdapterJNDI</activation-config-property-name> | <activation-config-property-value>java:/SnsJMSProvider</activation-config-property-value> | </activation-config-property> | </activation-config> | </message-driven> | </enterprise-beans> | </ejb-jar> But the contents that you have specified are not part of the ejb-jar dtd (http://java.sun.com/dtd/ejb-jar_2_0.dtd). Any reference from where you used these contents View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3982601#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...