[jboss-user] The DataSource is UNKNOWN run state

Hello, I'm new to JBoss ... I have installed jboss-5.1.0.GA and run it in default environment Before running it, I've put under JBOSS_HOME/server/default/lib mysql-connector-java-5.1.10-bin.jar and I've taken from docs/examples/jca the mysql-ds.xml file that i've modified with the right database properties (connection url, user and password - same properties i've used with SQuirrel) and put to default/deploy. The admin console shows me an UNKNOWN run state for this datasource. Any ideas on where should I look at ? Thanks for your help Frank