Configuring Oracle XE connection pool in Glassfish and Using JPA
To setup an Oracle Datasource in Glassfish, follow these steps: 1. Download and copy the Oracle JDBC driver (ojdbc14.jar ) to /glassfish/domains/domain1/lib/ext directory. 2. Start Glassfish. 3. Login to the admin interface and create a JDBC Connection Pool. Delete all properties, and add following properties: * user - set this to Oracle userid * password - set this to Oracle password * URL - set this to the URL, example jdbc:oracle:thin:@localhost:1521:xe. * xa-driver-does-not-support-non-tx-operations - set this to true. Test the connection pool using ping. 4. Create a JDBC DataSource using the Connection Pool. If in case of Oracle major version error : javax.persistence.PersistenceException: org.hibernate.HibernateException: unknown Oracle major version [11] The fix for the error is add <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect"/> in your persistence.xml