You have developed your applications to work with Java Persistence API (JPA) and now you must configure your JPA applications to work in your environment.
<jta-data-source>jdbc/myJTADataSource</jta-data-source>
<non-jta-data-source>jdbc/myNonJTADataSource</non-jta-data-source>
<jta-data-source>java:comp/env/jdbc/DataSourceJNDI</jta-data-source>
OR<jta-data-source>jdbc/DataSourceJNDI</jta-data-source>