Hi Jaikiran, I made sure that I have my datasource in the deployment directory. And I also checked that the deployed jar includes the persistence.xml file which uses the datasource, but I still have the same problem. Here is my -ds.xml: | <?xml version="1.0" encoding="UTF-8"?> | | | <datasources> | <local-tx-datasource> | <jndi-name>studProjectDS</jndi-name> | <connection-url>jdbc:postgresql://localhost:5432/Studproject</connection-url> | <driver-class>org.postgresql.Driver</driver-class> | <user-name>postgres</user-name> | <password>admin</password> | <!-- the minimum size of the connection pool --> | <min-pool-size>1</min-pool-size> | <!-- The maximum connections in a pool/sub-pool --> | <max-pool-size>100</max-pool-size> | </local-tx-datasource> | </datasources> | And here is the persistence.xml: <persistence | xmlns="http://java.sun.com/xml/ns/persistence" | xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" | version="1.0"> | | <persistence-unit name="StudProject"> | <jta-data-source>java:studProjectDS | </jta-data-source> | <properties> | <property name="hibernate.hbm2ddl.auto" value="update" /> | | <property name="hibernate.show_sql" value="true"/> | | </properties> | </persistence-unit> | </persistence> | Any suggestions are appreciated. Hatem PS: Sorry for the late reply I was on a vacation View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4199406#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...