javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: 分离的实体被传递到 hibernate 中

Question

日志：

javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: com.kzn.shoppingbackend.dto.Category
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:147)
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:155)
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:162)
    at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:780)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:758)
    at com.kzn.shoppingbackend.daoImpl.CategoryDAOImpl.update(CategoryDAOImpl.java:51)
    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.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    at org.springframework.transaction.interceptor.TransactionInterceptor.proceedWithInvocation(TransactionInterceptor.java:99)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
    at com.sun.proxy.$Proxy29.update(Unknown Source)
    at com.kzn.shoppingbackend.test.CategoryTestCase.updateCategory(CategoryTestCase.java:61)
    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.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access[=12=]0(ParentRunner.java:58)
    at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:268)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    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: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.PersistentObjectException: detached entity passed to persist: com.kzn.shoppingbackend.dto.Category
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:124)
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:58)
    at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:773)
    ... 40 more

CategoryTestCase.java

public class CategoryTestCase {
    private static AnnotationConfigApplicationContext context;
    private static CategoryDAO categoryDAO;
    private Category category;

    @BeforeClass
    public static void init() {
        context = new AnnotationConfigApplicationContext();
        context.scan("com.kzn.shoppingbackend");
        context.refresh();
        categoryDAO = (CategoryDAO)context.getBean("categoryDAO");
    }
    @Test
    public void updateCategory() {
        category = categoryDAO.get(2);
        category.setName("Lenovo");

        assertEquals("Successfully added a category inside the table!",true,categoryDAO.update(category));
    }
}

CategoryDaoImpl.java

@Repository("categoryDAO")
@Transactional
public class CategoryDAOImpl implements CategoryDAO {

    @Autowired
    private SessionFactory sessionFactory;
    /**
     * Method updating single Category
     * @return true if successful
     */
    @Override
    public boolean update(Category category) {
        try {
            sessionFactory.getCurrentSession().persist(category);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
}

在尝试更新传递给持久错误的分离实体时出现请帮助解决这个问题。为什么它无法保存为更新值，而每件事似乎都很完美更新数据库失败并出现分离错误的原因可能是什么

Answer 1

您必须使用

sessionFactory.getCurrentSession().update(category);

更新不是坚持

javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: 分离的实体被传递到 hibernate 中

javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist in hibernate

java

spring

hibernate

persistence