java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at examples.ejb20.basic.containerManaged.containerManaged_WebLogic_CMP_RDBMS.__WL_setup(containerManaged_WebLogic_CMP_RDBMS.java:825)
at weblogic.ejb20.manager.BaseEntityManager.createBean(BaseEntityManager.java:315)
at weblogic.ejb20.manager.BaseEJBManager.createBean(BaseEJBManager.java:159)
at weblogic.ejb20.pool.EntityPool.createBean(EntityPool.java:123)
at weblogic.ejb20.pool.Pool.createInitialBeans(Pool.java:132)
at weblogic.ejb20.pool.EntityPool.(EntityPool.java:57)
at weblogic.ejb20.manager.BaseEntityManager.setup(BaseEntityManager.java:175)
at weblogic.ejb20.manager.DBManager.setup(DBManager.java:124)
at weblogic.ejb20.deployer.ClientDrivenBeanInfoImpl.deploy(ClientDrivenBeanInfoImpl.java:645)
at weblogic.ejb20.deployer.Deployer.deployDescriptor(Deployer.java:1174)
at weblogic.ejb20.deployer.Deployer.deploy(Deployer.java:911)
at weblogic.j2ee.EJBComponent.deploy(EJBComponent.java:30)
at weblogic.j2ee.Application.addComponent(Application.java:160)
at weblogic.j2ee.J2EEService.addDeployment(J2EEService.java:115)
at weblogic.management.mbeans.custom.DeploymentTarget.addDeployment(DeploymentTarget.java:329)
at weblogic.management.mbeans.custom.DeploymentTarget.addDeployment(DeploymentTarget.java:144)
at weblogic.management.internal.DynamicMBeanImpl.invokeLocally(DynamicMBeanImpl.java:587)
at weblogic.management.internal.DynamicMBeanImpl.invoke(DynamicMBeanImpl.java:573)
at weblogic.management.internal.ConfigurationMBeanImpl.invoke(ConfigurationMBeanImpl.java:319)
at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1555)
at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1523)

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