The only change was to use DefaultDS as the jndi-name in mssql-ds.xml and remove hsqldb-ds.xml to eliminate the conflict. The assumption being the file name is irrelevant (any *-ds.xml pattern will do) and that all JDBC drivers must adhere to precisely the same interface. Looks like Quartz is using a column called CLUSTERED in a query? That raises some interesting questions in terms of reserved words and how a vendor can add extra ones not addressed by JDBC (or some other spec). Here is the error message: 17:59:30,625 INFO [QuartzScheduler] Quartz Scheduler v.1.5.2 created. 17:59:30,640 INFO [RAMJobStore] RAMJobStore initialized. 17:59:30,640 INFO [StdSchedulerFactory] Quartz scheduler 'DefaultQuartzScheduler' initialized from default resource file in Qua rtz package: 'quartz.properties' 17:59:30,640 INFO [StdSchedulerFactory] Quartz scheduler version: 1.5.2 17:59:30,640 INFO [QuartzScheduler] Scheduler DefaultQuartzScheduler_$_NON_CLUSTERED started. 17:59:31,140 INFO [ConnectionFactoryBindingService] Bound ConnectionManager 'jboss.jca:service=DataSourceBinding,name=DefaultDS ' to JNDI name 'java:DefaultDS' 17:59:34,671 INFO [ServerPeer] JBoss Messaging 1.4.3.GA server [0] started 17:59:38,343 WARN [JDBCSupport] SQLException caught, SQLState S0001 code:156- assuming deadlock detected, try:1 com.microsoft.sqlserver.jdbc.SQLServerException: Incorrect syntax near the keyword 'CLUSTERED'. at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:196) View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4220107#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...