yexianyi

JDev Bug: Database platform class [IBM DB2] not found

Issue:

After generated the persistence.xml file using JDevelper 11g, you may got following exception, while you invoke persist operation.

javax.ejb.EJBException: EJB Exception: ; nested exception is:
    javax.persistence.PersistenceException: Exception [EclipseLink-7042] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Database platform class [IBM DB2] not found.
Internal Exception: Exception [EclipseLink-3007] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [IBM DB2], of class [class java.lang.String], could not be converted to [class java.lang.Class]. Ensure that the class [IBM DB2] is on the CLASSPATH. You may need to use alternate API passing in the appropriate class loader as required, or setting it on the default ConversionManager
Internal Exception: java.lang.ClassNotFoundException: IBM DB2; nested exception is: javax.persistence.PersistenceException: Exception [EclipseLink-7042] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Database platform class [IBM DB2] not found.
Internal Exception: Exception [EclipseLink-3007] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [IBM DB2], of class [class java.lang.String], could not be converted to [class java.lang.Class]. Ensure that the class [IBM DB2] is on the CLASSPATH. You may need to use alternate API passing in the appropriate class loader as required, or setting it on the default ConversionManager
Internal Exception: java.lang.ClassNotFoundException: IBM DB2
javax.persistence.PersistenceException: Exception [EclipseLink-7042] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Database platform class [IBM DB2] not found.
Internal Exception: Exception [EclipseLink-3007] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [IBM DB2], of class [class java.lang.String], could not be converted to [class java.lang.Class]. Ensure that the class [IBM DB2] is on the CLASSPATH. You may need to use alternate API passing in the appropriate class loader as required, or setting it on the default ConversionManager
Internal Exception: java.lang.ClassNotFoundException: IBM DB2
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:290)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:146)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:198)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:186)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at weblogic.deployment.EntityManagerFactoryProxyImpl.invoke(EntityManagerFactoryProxyImpl.java:75)
    at $Proxy171.createEntityManager(Unknown Source)
    at weblogic.deployment.TransactionalEntityManagerProxyImpl.newPersistenceContext(TransactionalEntityManagerProxyImpl.java:75)
    at weblogic.deployment.BasePersistenceContextProxyImpl.getPersistenceContext(BasePersistenceContextProxyImpl.java:160)
    at weblogic.deployment.BasePersistenceContextProxyImpl.invoke(BasePersistenceContextProxyImpl.java:88)
    at weblogic.deployment.TransactionalEntityManagerProxyImpl.invoke(TransactionalEntityManagerProxyImpl.java:91)
    at weblogic.deployment.BasePersistenceContextProxyImpl.invoke(BasePersistenceContextProxyImpl.java:80)
    at weblogic.deployment.TransactionalEntityManagerProxyImpl.invoke(TransactionalEntityManagerProxyImpl.java:26)
    at $Proxy172.persist(Unknown Source)
    at model.entity.dao.impls.CustomerDAOBean.persistCustomer(CustomerDAOBean.java:35)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.bea.core.repackaged.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
    at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
    at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
    at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
    at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
    at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    at com.bea.core.repackaged.springframework.jee.spi.MethodInvocationVisitorImpl.visit(MethodInvocationVisitorImpl.java:37)
    at weblogic.ejb.container.injection.EnvironmentInterceptorCallbackImpl.callback(EnvironmentInterceptorCallbackImpl.java:55)
    at com.bea.core.repackaged.springframework.jee.spi.EnvironmentInterceptor.invoke(EnvironmentInterceptor.java:50)
    at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    at com.bea.core.repackaged.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
    at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
    at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
    at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    at com.bea.core.repackaged.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    at $Proxy174.persistCustomer(Unknown Source)
    at model.entity.dao.impls.CustomerDAO_7f7els_CustomerDAORemoteImpl.persistCustomer(CustomerDAO_7f7els_CustomerDAORemoteImpl.java:215)
    at model.entity.dao.impls.CustomerDAO_7f7els_CustomerDAORemoteImpl_WLSkel.invoke(Unknown Source)
    at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:589)
    at weblogic.rmi.cluster.ClusterableServerRef.invoke(ClusterableServerRef.java:230)
    at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:477)
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:363)
    at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:147)
    at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:473)
    at weblogic.rmi.internal.wls.WLSExecuteRequest.run(WLSExecuteRequest.java:118)
    at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
    at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Caused by: Exception [EclipseLink-7042] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Database platform class [IBM DB2] not found.
Internal Exception: Exception [EclipseLink-3007] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [IBM DB2], of class [class java.lang.String], could not be converted to [class java.lang.Class]. Ensure that the class [IBM DB2] is on the CLASSPATH. You may need to use alternate API passing in the appropriate class loader as required, or setting it on the default ConversionManager
Internal Exception: java.lang.ClassNotFoundException: IBM DB2
    at org.eclipse.persistence.exceptions.ValidationException.platformClassNotFound(ValidationException.java:1463)
    at org.eclipse.persistence.sessions.DatasourceLogin.setPlatformClassName(DatasourceLogin.java:517)
    at org.eclipse.persistence.sessions.DatasourceLogin.setPlatformClassName(DatasourceLogin.java:553)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.updateLogins(EntityManagerSetupImpl.java:1069)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.updateServerSession(EntityManagerSetupImpl.java:1356)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:260)
    ... 49 more
Caused by: Exception [EclipseLink-3007] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [IBM DB2], of class [class java.lang.String], could not be converted to [class java.lang.Class]. Ensure that the class [IBM DB2] is on the CLASSPATH. You may need to use alternate API passing in the appropriate class loader as required, or setting it on the default ConversionManager
Internal Exception: java.lang.ClassNotFoundException: IBM DB2
    at org.eclipse.persistence.exceptions.ConversionException.couldNotBeConvertedToClass(ConversionException.java:87)
    at org.eclipse.persistence.internal.helper.ConversionManager.convertObjectToClass(ConversionManager.java:440)
    at org.eclipse.persistence.internal.helper.ConversionManager.convertObject(ConversionManager.java:141)
    at org.eclipse.persistence.internal.helper.ConversionManager.loadClass(ConversionManager.java:858)
    at org.eclipse.persistence.sessions.DatasourceLogin.setPlatformClassName(DatasourceLogin.java:503)
    ... 53 more
Caused by: java.lang.ClassNotFoundException: IBM DB2
    at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:296)
    at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:269)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:177)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:247)
    at org.eclipse.persistence.internal.helper.ConversionManager.convertObjectToClass(ConversionManager.java:437)
    ... 56 more
javax.ejb.EJBException: EJB Exception: ; nested exception is:
    javax.persistence.PersistenceException: Exception [EclipseLink-7042] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Database platform class [IBM DB2] not found.
Internal Exception: Exception [EclipseLink-3007] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [IBM DB2], of class [class java.lang.String], could not be converted to [class java.lang.Class]. Ensure that the class [IBM DB2] is on the CLASSPATH. You may need to use alternate API passing in the appropriate class loader as required, or setting it on the default ConversionManager
Internal Exception: java.lang.ClassNotFoundException: IBM DB2; nested exception is: javax.persistence.PersistenceException: Exception [EclipseLink-7042] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Database platform class [IBM DB2] not found.
Internal Exception: Exception [EclipseLink-3007] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [IBM DB2], of class [class java.lang.String], could not be converted to [class java.lang.Class]. Ensure that the class [IBM DB2] is on the CLASSPATH. You may need to use alternate API passing in the appropriate class loader as required, or setting it on the default ConversionManager
Internal Exception: java.lang.ClassNotFoundException: IBM DB2
    at weblogic.ejb.container.internal.RemoteBusinessIntfProxy.unwrapRemoteException(RemoteBusinessIntfProxy.java:109)
    at weblogic.ejb.container.internal.RemoteBusinessIntfProxy.invoke(RemoteBusinessIntfProxy.java:91)
    at $Proxy0.persistCustomer(Unknown Source)
    at client.ejb.CustomerDAORemoteClient.main(CustomerDAORemoteClient.java:19)
Caused by: javax.persistence.PersistenceException: Exception [EclipseLink-7042] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Database platform class [IBM DB2] not found.
Internal Exception: Exception [EclipseLink-3007] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [IBM DB2], of class [class java.lang.String], could not be converted to [class java.lang.Class]. Ensure that the class [IBM DB2] is on the CLASSPATH. You may need to use alternate API passing in the appropriate class loader as required, or setting it on the default ConversionManager
Internal Exception: java.lang.ClassNotFoundException: IBM DB2
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:290)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:146)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:198)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:186)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at weblogic.deployment.EntityManagerFactoryProxyImpl.invoke(EntityManagerFactoryProxyImpl.java:75)
    at $Proxy171.createEntityManager(Unknown Source)
    at weblogic.deployment.TransactionalEntityManagerProxyImpl.newPersistenceContext(TransactionalEntityManagerProxyImpl.java:75)
    at weblogic.deployment.BasePersistenceContextProxyImpl.getPersistenceContext(BasePersistenceContextProxyImpl.java:160)
    at weblogic.deployment.BasePersistenceContextProxyImpl.invoke(BasePersistenceContextProxyImpl.java:88)
    at weblogic.deployment.TransactionalEntityManagerProxyImpl.invoke(TransactionalEntityManagerProxyImpl.java:91)
    at weblogic.deployment.BasePersistenceContextProxyImpl.invoke(BasePersistenceContextProxyImpl.java:80)
    at weblogic.deployment.TransactionalEntityManagerProxyImpl.invoke(TransactionalEntityManagerProxyImpl.java:26)
    at $Proxy172.persist(Unknown Source)
    at model.entity.dao.impls.CustomerDAOBean.persistCustomer(CustomerDAOBean.java:35)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.bea.core.repackaged.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
    at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
    at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
    at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
    at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
    at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    at com.bea.core.repackaged.springframework.jee.spi.MethodInvocationVisitorImpl.visit(MethodInvocationVisitorImpl.java:37)
    at weblogic.ejb.container.injection.EnvironmentInterceptorCallbackImpl.callback(EnvironmentInterceptorCallbackImpl.java:55)
    at com.bea.core.repackaged.springframework.jee.spi.EnvironmentInterceptor.invoke(EnvironmentInterceptor.java:50)
    at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    at com.bea.core.repackaged.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
    at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
    at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
    at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    at com.bea.core.repackaged.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    at $Proxy174.persistCustomer(Unknown Source)
    at model.entity.dao.impls.CustomerDAO_7f7els_CustomerDAORemoteImpl.persistCustomer(CustomerDAO_7f7els_CustomerDAORemoteImpl.java:215)
    at model.entity.dao.impls.CustomerDAO_7f7els_CustomerDAORemoteImpl_WLSkel.invoke(Unknown Source)
    at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:589)
    at weblogic.rmi.cluster.ClusterableServerRef.invoke(ClusterableServerRef.java:230)
    at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:477)
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:363)
    at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:147)
    at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:473)
    at weblogic.rmi.internal.wls.WLSExecuteRequest.run(WLSExecuteRequest.java:118)
    at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
    at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Caused by: Exception [EclipseLink-7042] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Database platform class [IBM DB2] not found.
Internal Exception: Exception [EclipseLink-3007] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [IBM DB2], of class [class java.lang.String], could not be converted to [class java.lang.Class]. Ensure that the class [IBM DB2] is on the CLASSPATH. You may need to use alternate API passing in the appropriate class loader as required, or setting it on the default ConversionManager
Internal Exception: java.lang.ClassNotFoundException: IBM DB2
    at org.eclipse.persistence.exceptions.ValidationException.platformClassNotFound(ValidationException.java:1463)
    at org.eclipse.persistence.sessions.DatasourceLogin.setPlatformClassName(DatasourceLogin.java:517)
    at org.eclipse.persistence.sessions.DatasourceLogin.setPlatformClassName(DatasourceLogin.java:553)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.updateLogins(EntityManagerSetupImpl.java:1069)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.updateServerSession(EntityManagerSetupImpl.java:1356)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:260)
    ... 49 more
Caused by: Exception [EclipseLink-3007] (Eclipse Persistence Services - 1.2.0.v20091016-r5565): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [IBM DB2], of class [class java.lang.String], could not be converted to [class java.lang.Class]. Ensure that the class [IBM DB2] is on the CLASSPATH. You may need to use alternate API passing in the appropriate class loader as required, or setting it on the default ConversionManager
Internal Exception: java.lang.ClassNotFoundException: IBM DB2
    at org.eclipse.persistence.exceptions.ConversionException.couldNotBeConvertedToClass(ConversionException.java:87)
    at org.eclipse.persistence.internal.helper.ConversionManager.convertObjectToClass(ConversionManager.java:440)
    at org.eclipse.persistence.internal.helper.ConversionManager.convertObject(ConversionManager.java:141)
    at org.eclipse.persistence.internal.helper.ConversionManager.loadClass(ConversionManager.java:858)
    at org.eclipse.persistence.sessions.DatasourceLogin.setPlatformClassName(DatasourceLogin.java:503)
    ... 53 more
Caused by: java.lang.ClassNotFoundException: IBM DB2
    at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:296)
    at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:269)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:177)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:247)
    at org.eclipse.persistence.internal.helper.ConversionManager.convertObjectToClass(ConversionManager.java:437)
    ... 56 more
Process exited with exit code 0.

Solution:

This is a bug of JDeveloper. There is a mistake in auto generation persistence.xml. Please go to persistence.xml and check property, "eclipselink.target-database"

The correct value should be

<property name="eclipselink.target-database"  value="DB2"/>

but in fact is

 <property name="eclipselink.target-database" value="IBM DB2"/>

For the details about setting properties, please refer to

http://wiki.eclipse.org/Using_EclipseLink_JPA_Extensions_(ELUG)

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O/R Mapping 是 Object Relational Mapping（对象关系映射）的缩写。通俗点讲，就是将对象与关系数据库绑定，用对象来表示关系数据。在O/R Mapping的世界里，有两个基本的也是重要的东东需要了解，即VO，PO。它们的关系应该是相互独立的，一个VO可以只是PO的部分，也可以是多个PO构成，同样也可以等同于一个PO（指的是他们的属性）。这样，PO独立出来，数据持