Question

我认为我可以坚持使用entitymanager的方法持久化我的spring对象。其实我用的是春天的roo。但是当我从数据库中取出一个对象时，我无法做到：

object.persist(); // <--- it doesn't work

有谁知道为什么？我在哪里可以找到文件？

我遇到了这个例外：

 org.springframework.orm.jpa.JpaSystemException: org.hibernate.PersistentObjectException: detached entity passed to persist: com.movi.duckury.server.domain.LoginLog; nested exception is javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: com.movi.duckury.server.domain.LoginLog
at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:311)
at org.springframework.orm.jpa.aspectj.JpaExceptionTranslatorAspect.ajc$afterThrowing$org_springframework_orm_jpa_aspectj_JpaExceptionTranslatorAspect$1$18a1ac9(JpaExceptionTranslatorAspect.aj:15)
at com.movi.duckury.server.domain.LoginLog_Roo_Entity.ajc$interMethod$com_movi_duckury_server_domain_LoginLog_Roo_Entity$com_movi_duckury_server_domain_LoginLog$persist(LoginLog_Roo_Entity.aj:54)
at com.movi.duckury.server.domain.LoginLog.persist(LoginLog.java:1)
at com.movi.duckury.server.domain.LoginLog_Roo_Entity.ajc$interMethodDispatch1$com_movi_duckury_server_domain_LoginLog_Roo_Entity$com_movi_duckury_server_domain_LoginLog$persist(LoginLog_Roo_Entity.aj)
at com.movi.duckury.server.web.LoginLogControllerTest.findLoginLogsBySessionIdTest(LoginLogControllerTest.java:101)
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:601)
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.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:240)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
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:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:180)
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)

引起：javax.persistence.PersistenceException：org.hibernate.PersistentObjectException：传递给persist的分离实体：com.movi.duckury.server.domain.LoginLog 在org.hibernate.ejb.AbstractEntityManagerImpl.convert（AbstractEntityManagerImpl.java:1214）在org.hibernate.ejb.AbstractEntityManagerImpl.convert（AbstractEntityManagerImpl.java:1147）在org.hibernate.ejb.AbstractEntityManagerImpl.convert（AbstractEntityManagerImpl.java:1153）在org.hibernate.ejb.AbstractEntityManagerImpl.persist（AbstractEntityManagerImpl.java:678） at sun.reflect.GeneratedMethodAccessor21.invoke（未知来源） at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:601）在org.springframework.orm.jpa.SharedEntityManagerCreator $ SharedEntityManagerInvocationHandler.invoke（SharedEntityManagerCreator.java:240） at sun.proxy。$ Proxy54.persist（Unknown Source） ......还有34个引起：org.hibernate.PersistentObjectException：传递给persist的分离实体：com.movi.duckury.server.domain.LoginLog 在org.hibernate.event.def.DefaultPersistEventListener.onPersist（DefaultPersistEventListener.java:127）在org.hibernate.event.def.DefaultPersistEventListener.onPersist（DefaultPersistEventListener.java:61）在org.hibernate.impl.SessionImpl.firePersist（SessionImpl.java:808）在org.hibernate.impl.SessionImpl.persist（SessionImpl.java:782）在org.hibernate.impl.SessionImpl.persist（SessionImpl.java:786）在org.hibernate.ejb.AbstractEntityManagerImpl.persist（AbstractEntityManagerImpl.java:672） ... 39更多

感谢。

Answer 1

因为它已经持续存在。基本上会发生主键冲突。

使用object.merge()（如果我没记错，由Roo创建的方法的名称）

斯特凡诺

Answer 2

JPA EntityManager: Why use persist() over merge()?

http://www.objectdb.com/java/jpa/persistence/store

为什么我不能在从数据库中取出的对象中使用persist？

2 个答案: