object references an unsaved transient instance - save the transient instance before flushing: org.t

org.springframework.dao.InvalidDataAccessApiUsageException: object references an unsaved transient instance - save the transient instance before flushing: org.test.ssh.model.Message; nested exception is org.hibernate.TransientObjectException: object references
an unsaved transient instance - save the transient instance before flushing: org.test.ssh.model.Message

    at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:671)

    at org.springframework.orm.hibernate3.HibernateTransactionManager.convertHibernateAccessException(HibernateTransactionManager.java:793)

    at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:664)

    at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)

    at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723)

    at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:392)

    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:120)

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)

    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:90)

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)

    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)

    at com.sun.proxy.$Proxy20.add(Unknown Source)

    at org.test.ssh.service.MessageServiceTest.testAdd(MessageServiceTest.java:32)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:497)

    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)

    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)

    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)

    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)

    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)

    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)

    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)

    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)

    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)

    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)

    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)

    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)

    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)

    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)

    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)

    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)

    at org.junit.runners.ParentRunner.run(ParentRunner.java:300)

    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)

    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)

    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: org.test.ssh.model.Message（意思是：[b]对象引用未保存的瞬态实例保存瞬时冲洗之前；也就是说需要先保存Message，这里忘记保存了。）[/b]

    at org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:243)

    at org.hibernate.type.EntityType.getIdentifier(EntityType.java:456)

    at org.hibernate.type.ManyToOneType.isDirty(ManyToOneType.java:265)

    at org.hibernate.type.ManyToOneType.isDirty(ManyToOneType.java:275)

    at org.hibernate.type.TypeHelper.findDirty(TypeHelper.java:295)

    at org.hibernate.persister.entity.AbstractEntityPersister.findDirty(AbstractEntityPersister.java:3403)

    at org.hibernate.event.def.DefaultFlushEntityEventListener.dirtyCheck(DefaultFlushEntityEventListener.java:520)

    at org.hibernate.event.def.DefaultFlushEntityEventListener.isUpdateNecessary(DefaultFlushEntityEventListener.java:230)

    at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:154)

    at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:219)

    at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)

    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)

    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)

    at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)

    at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)

    at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:656)

    ... 38 more