Slight update: I downloaded the source for the correct release of JBoss AS, where the faulting line is: | (140) DataSource ds = (DataSource) ctx.lookup(dsJndiName); | (141) conn = ds.getConnection(); | Now, the strange thing is that ds is null no matter what the datasource is set to in login-config.xml. Even not setting it (making it default to java:/DefaultDS (with HSQL)) yields a NPE at this point. What's even more strange is that a JPA/Hibernate model in the same EAR uses the same datasource, and this works flawlessly. The log clearly states: | 15:31:57,342 INFO [ConnectionFactoryBindingService] Bound ConnectionManager 'jboss.jca:service=DataSourceBinding,name=FluxMonClockerDS' to JNDI name 'java:FluxMonClockerDS' | As I wrote in the previous post -- all help is appreciated! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4122225#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...