Spring JPA / Hibernate org.hibernate.AssertionFailure：实体中的null id（发生异常后不要刷新Session）

时间：2014-08-13 05:21:34

标签： java spring hibernate jpa interceptor

专家/大师/好友

我们的应用程序运行Spring 3.2，JPA 2，Hibernate 4.2技术堆栈与MySQL＆amp; Tomcat 7.我们得到一个奇怪的例外，这是一个很难解决的问题。我们有一个非常简单的实体，通过Junit测试很好地运行，没有任何问题。但是当我添加Hibernate EmptyInterceptor（在这里移动了常见的公司逻辑）时，我得到了下面提到的异常。或者我甚至尝试了Hibernate PreInsertEventListener但同样的异常。

在阅读了stackoverflow中的几篇帖子 - this和this以及few others之后，我认为使用EntityManager（在Interceptor中）的读取操作会触发自动刷新，从而导致异常被抛出但无法确定它是什么。此外，我删除了这个简单的Entity类以及表中的任何非null约束（它甚至没有外键）。

MYSQL表 

    CREATE TABLE  `rcent_rel_2`.`worklist_status_master` (
              `worklist_status_seqid` int(10) unsigned NOT NULL AUTO_INCREMENT,
              `worklist_status_name` varchar(45) DEFAULT NULL,
              `created_by` varchar(45) DEFAULT '',
              `updated_ts` datetime DEFAULT NULL,
              `updated_by` varchar(45) DEFAULT '',
              `comp_seq_id` int(10) unsigned DEFAULT NULL,
              `created_ts` datetime DEFAULT NULL,
              PRIMARY KEY (`worklist_status_seqid`)
            ) ENGINE=InnoDB AUTO_INCREMENT=65 DEFAULT CHARSET=latin1;

简单实体 

@Entity
@Table(name="worklist_status_master")
public class WorklistStatusDO  implements Serializable {
    private static final long serialVersionUID = 1L; 
    private static final Logger log = LoggerFactory.getLogger(WorklistStatusDO.class);

    private Integer id;
    private String workListStatusName;

    @Id
    //@GeneratedValue(strategy = GenerationType.IDENTITY) -- Tried this too
    @GeneratedValue
    @Column(name="worklist_status_seqid")
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    @Column(name="worklist_status_name")
    public String getWorkListStatusName() {
        return workListStatusName;
    }
    public void setWorkListStatusName(String workListStatusName) {
        this.workListStatusName = workListStatusName;
    }
    public WorklistStatusDO workListStatusName(String workListStatusName) {
        setWorkListStatusName(workListStatusName);
        return this;
    }

    @Override
    public String toString(){
        return Objects.toStringHelper(this).
                add("workListStatusName", getWorkListStatusName()).toString();
    }

    @Override
    public int hashCode() {
        return super.hashCode();
    }
    @Override
    public boolean equals(Object obj) {
        return (this == obj || (obj instanceof WorklistStatusDO && obj.hashCode() == hashCode()));
    }
}

Junit working scenairo 

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(value =  "classpath*:/spring/applicationContext.xml")
@Transactional
public class WorklistStatusTest {

    @PersistenceContext
    private EntityManager entityManager;

    @Test
    public void saveWorklistStatus(){
        CompanyInfo.setCompanyName("ABC");
        UserInfo.setUserId("XYZ");

        WorklistStatusDO worklistStatus = new WorklistStatusDO();
        worklistStatus.workListStatusName("test");

        // Company Logic
        javax.persistence.Query query = entityManager.createQuery("Select c From CompanyMasterDO c Where c.companyName =:companyName");
        query.setParameter("companyName", CompanyInfo.getCompanyName());
        CompanyMasterDO companyMasterDO = (CompanyMasterDO) query.getSingleResult();

        assertThat(companyMasterDO).isNotNull();

        entityManager.persist(worklistStatus);
    }

}

在将公司逻辑移至拦截器后由于以下异常导致Junit失败的情况 

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(value =  "classpath*:/spring/applicationContext.xml")
@Transactional
public class WorklistStatusTest {

    @PersistenceContext
    private EntityManager entityManager;

    @Test
    public void saveWorklistStatus(){
        CompanyInfo.setCompanyName("ABC");
        UserInfo.setUserId("XYZ");

        WorklistStatusDO worklistStatus = new WorklistStatusDO();
        worklistStatus.workListStatusName("test");

        // Company Logic moved to Interceptor

        entityManager.persist(worklistStatus);
    }

}

EmptyInterceptor 

@Named
@Transactional
public class AuditEmptyInterceptor extends EmptyInterceptor {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @PersistenceContext
    private EntityManager entityManager;

    @Override
    public boolean onSave(Object entity, Serializable id, Object[] currentState,
            String[] propertyNames, Type[] types) {

        System.out.println("*********************inside OnSave() in Audit Empty Interceptor******************");
        javax.persistence.Query query = entityManager.createQuery("Select c From CompanyMasterDO c Where c.companyName =:companyName");
        query.setParameter("companyName", CompanyInfo.getCompanyName());
        CompanyMasterDO companyMasterDO = (CompanyMasterDO) query.getSingleResult();

        return false;
    }

异常 

    org.hibernate.AssertionFailure: null id in com.work.WorklistStatusDO entry (don't flush the Session after an exception occurs)
    at org.hibernate.event.internal.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:79)
    at org.hibernate.event.internal.DefaultFlushEntityEventListener.getValues(DefaultFlushEntityEventListener.java:194)
    at org.hibernate.event.internal.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:156)
    at org.hibernate.event.internal.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:228)
    at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:100)
    at org.hibernate.event.internal.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:58)
    at org.hibernate.internal.SessionImpl.autoFlushIfRequired(SessionImpl.java:1205)
    at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1262)
    at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
    at org.hibernate.ejb.QueryImpl.getSingleResult(QueryImpl.java:287)
    at com.company.demo.audit.AuditEmptyInterceptor.onSave(AuditEmptyInterceptor.java:45)
    at com.company.demo.audit.StaticDelegateInterceptor.onSave(StaticDelegateInterceptor.java:24)
    at org.hibernate.event.internal.AbstractSaveEventListener.substituteValuesIfNecessary(AbstractSaveEventListener.java:387)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:268)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:192)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)
    at org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:78)
    at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:208)
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:151)
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:78)
    at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:853)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:827)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:831)
    at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:875)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:241)
    at com.sun.proxy.$Proxy49.persist(Unknown Source)
    at com.rcent.test.worklist.WorklistStatusTest.saveWorklistStatus(WorklistStatusTest.java:42)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    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.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    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:309)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

注意：

之前有一个注入EmptyInterceptor的问题。现在解决了here in stackoverflow。感谢里卡多。

3 个答案:

答案 0 :(得分：3)

尝试使用Hibernate EventListener而不是拦截器：

@Component
public class AuditEventListener implements PersistEventListener, DeleteEventListener, MergeEventListener, PreInsertEventListener {

  @PersistenceContext
  private EntityManager entityManager;

     @Override 
     public boolean onPreInsert(PreInsertEvent event) {
          return false; 
     } 

     @Override
     public void onPersist(PersistEvent event) {
        // you business logic
     }

     ... 
     ...
}

您可以使用此bean注册侦听器：

@Component
public class HibernateListenerRegistrar {
   @PersistenceUnit
   private EntityManagerFactory entityManagerFactory;

   @Autowired
   private AuditEventListener auditEventListener;

   @PostConstruct
   public void registerListeners() {
      if(entityManagerFactory instanceof HibernateEntityManagerFactory) {
          final HibernateEntityManagerFactory  hibernateEntityManagerFactory = (HibernateEntityManagerFactory) entityManagerFactory;
          final SessionFactoryImpl sessionFactory =  (SessionFactoryImpl) hibernateEntityManagerFactory.getSessionFactory();
          final EventListenerRegistry registry = sessionFactory.getServiceRegistry().getService(EventListenerRegistry.class);
          registry.getEventListenerGroup(EventType.PERSIST).appendListener(auditEventListener);
          registry.getEventListenerGroup(EventType.MERGE).appendListener(auditEventListener);
          registry.getEventListenerGroup(EventType.DELETE).appendListener(auditEventListener);
          registry.getEventListenerGroup(EventType.PRE_INSERT).appendListener(auditEventListener);
          // register other events here
      }
    }
}

修改

如果要在PRE_INSERT事件期间执行查询并且数据库生成ID，则此方法将不起作用。如果您手动生成ID（或在事务之前从数据库中获取它们），您应该能够在PRE_INSERT期间执行查询而不会出现问题。我已经使用手动分配的ID对此进行了测试。

根据您的审计要求，您可能在PERSIST事件期间（在Hibernate生成ID之后发生）实现逻辑。

希望这有帮助。

答案 1 :(得分：1)

错误表示未生成ID。此外，一些数据库不喜欢使用名为“id”的列名的用户。

尝试以这种方式使用id生成器注释：

@GeneratedValue(strategy=GenerationType.AUTO, generator="seqMyObject")
@SequenceGenerator(name="seqMyObject", sequenceName="TBBROKERCONTACTSYNC_SEQ")

在上面的代码片段中，我使用的是数据库序列。

也可以这样做。

@Id
@GenericGenerator(name="gen",strategy="increment")
@GeneratedValue(generator="gen")
@Column(name = "ID", unique = true, nullable = false, precision = 15, scale = 0)
private Long id;

OR 

@Id @GeneratedValue(strategy=GenerationType.IDENTITY)
private Long id;

MYSQL使用身份策略自动增加。

答案 2 :(得分：0)

当DB是只读的并且尝试了写操作时，甚至可能发生此错误。

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