When I use the default deployment order for JBoss it works fine. We want to deploy Alerter.jar before deploying scheduler-service.xml. Here, scheduler-service.xml looks for the Alerter class in Alerter.jar. So I changed the deployment order for .jar and -service.xml. Alerter.jar points to 'MSSQLDSA' data source. So while deploying Alerter.jar it looks for it and throws the above error. I tried to change the deployment order for -ds.xml also but it throws the same error. Following is the scheculer-service.xml configuration: | <server> | | <mbean code="org.jboss.varia.scheduler.Scheduler" | name="jboss:service=Scheduler"> | <attribute name="StartAtStartup">true</attribute> | <attribute name="SchedulableClass">com.soa.alerter.Alerter</attribute> | <attribute name="SchedulableArguments">true</attribute> | <attribute name="SchedulableArgumentTypes">boolean</attribute> | | <attribute name="InitialStartDate">NOW</attribute> | <attribute name="SchedulePeriod">60000</attribute> | <attribute name="InitialRepetitions">-1</attribute> | </mbean> | | </server> | Sunil View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4211685#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...