I'm still getting this error with spring 2.5.6/jboss4.2.3 persistence definition jboss-web.xml <?xml version="1.0" encoding="UTF-8"?> <jboss-web> <security-domain>java:/jaas/clients</security-domain> <resource-ref> <res-ref-name>jdbc/JRWDS</res-ref-name> <res-type>javax.sql.DataSource</res-type> <jndi-name>java:JRWDS</jndi-name> </resource-ref> </jboss-web> entry in web.xml <resource-ref> <res-ref-name>jdbc/JRWDS</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref> datasource file mssql-ds.xml in deploy jboss folder <local-tx-datasource> <jndi-name>JRWDS</jndi-name> <connection-url>jdbc:microsoft:sqlserver://xxx</connection-url> <driver-class>com.microsoft.sqlserver.jdbc.SQLServerDriver </driver-class> <user-name>xxxx</user-name> xxxx <!-- sql to call when connection is created <new-connection-sql>some arbitrary sql</new-connection-sql> --> <!-- sql to call on an existing pooled connection when it is obtained from pool <check-valid-connection-sql>some arbitrary sql</check-valid-connection-sql> --> <!-- corresponding type-mapping in the standardjbosscmp-jdbc.xml (optional) --> <type-mapping>MS SQLSERVER2000</type-mapping> </local-tx-datasource> the JNDI resource is bound ... 12:37:24,937 INFO [ConnectionFactoryBindingService] Bound ConnectionManager 'jboss.jca:service=DataSourceBinding,name=JRWDS' to JNDI name 'java:JRWDS' but my app deployed apps fails nested exception is javax.naming.NameNotFoundException: JNDI object with [java:JRWDS] not found: JNDI implementation returned null any clues....? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4214613#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...