/**

     * 测试4:新增一个秘书角色，并赋给张三该角色

     */

    @Test

    public void test4(){

        Session session = HibernateUtils.openSession();

        Transaction tx = session.beginTransaction();

        /******S  开始业务逻辑*************/

        //get方法获取的对象都是持久态

        Role r1 = new Role();

        r1.setRole_name("秘书");

        User user = session.get(User.class,1l);

        user.getRoles().add(r1);

        session.update(user);

        /******E  开始业务逻辑*************/

        tx.commit();

    }

org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: cn.qlq.domain.Role

    at org.hibernate.engine.internal.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:279)

    at org.hibernate.type.EntityType.getIdentifier(EntityType.java:455)

    at org.hibernate.type.ManyToOneType.nullSafeSet(ManyToOneType.java:144)

    at org.hibernate.persister.collection.AbstractCollectionPersister.writeElement(AbstractCollectionPersister.java:888)

    at org.hibernate.persister.collection.AbstractCollectionPersister.insertRows(AbstractCollectionPersister.java:1545)

    at org.hibernate.action.internal.CollectionUpdateAction.execute(CollectionUpdateAction.java:85)

    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:560)

    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:434)

    at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:337)

    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39)

    at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1282)

    at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:465)

    at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:2963)

    at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2339)

    at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:485)

    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:147)

    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$100(JdbcResourceLocalTransactionCoordinatorImpl.java:38)

    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:231)

    at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:65)

    at cn.qlq.relation.Many2Many.test4(Many2Many.java:103)

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

    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

    at java.lang.reflect.Method.invoke(Unknown Source)

    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)

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

    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)

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

    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)

    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)

    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)

    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)

    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)

    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)

    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)

    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)

    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)

    /**

     * 测试4:新增一个秘书角色，并赋给张三该角色

     */

    @Test

    public void test4(){

        Session session = HibernateUtils.openSession();

        Transaction tx = session.beginTransaction();

        /******S  开始业务逻辑*************/

        //get方法获取的对象都是持久态

        Role r1 = new Role();

        r1.setRole_name("秘书");

        User user = session.get(User.class,1l);

        user.getRoles().add(r1);

        session.save(r1);

        session.update(user);

        /******E  开始业务逻辑*************/

        tx.commit();

    }