Java JPA当前没有活动的交易

使用JPA和EclipseLink实现

代码：

try{
    if(!em.getTransaction().isActive())
        em.getTransaction().begin(); 
    System.out.println(2);
    em.persist(currentUser);
    System.out.println(3);
    if (em.getTransaction().isActive()){
        System.out.println("IS ACTIVE");
    } else {
        System.out.println("NO ACTIVE");
    }
    em.getTransaction().commit();
    System.out.println(4);
    } catch (Exception e){
    completed = false;
    em.getTransaction().rollback();
    System.out.println("ERROR: " + e.getMessage());
}

INFO: persistOne - Enter
INFO: 2
INFO: 3
INFO: IS ACTIVE
INFO: [EL Warning]: 2012-01-06 14:45:59.221--UnitOfWork(12492659)--java.lang.IllegalStateException: During synchronization a new object was found through a relationship that was not marked cascade PERSIST: com.maze.model.UserDetail@d52ea.

WARNING: #{accountController.performRegister}: java.lang.IllegalStateException: 
Exception Description: No transaction is currently active
javax.faces.FacesException: #{accountController.performRegister}: java.lang.IllegalStateException: 
Exception Description: No transaction is currently active
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
    at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:662)
Caused by: javax.faces.el.EvaluationException: java.lang.IllegalStateException: 
Exception Description: No transaction is currently active
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    ... 32 more
Caused by: java.lang.IllegalStateException: 
Exception Description: No transaction is currently active
    at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.rollback(EntityTransactionImpl.java:122)
    at com.maze.service.UserService.persistOne(UserService.java:63)
    at com.maze.controller.request.AccountController.performRegister(AccountController.java:62)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.sun.el.parser.AstValue.invoke(AstValue.java:234)
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
    ... 33 more

错误：

try{
    if(!em.getTransaction().isActive())
        em.getTransaction().begin(); 
    System.out.println(2);
    em.persist(currentUser);
    System.out.println(3);
    if (em.getTransaction().isActive()){
        System.out.println("IS ACTIVE");
    } else {
        System.out.println("NO ACTIVE");
    }
    em.getTransaction().commit();
    System.out.println(4);
    } catch (Exception e){
    completed = false;
    em.getTransaction().rollback();
    System.out.println("ERROR: " + e.getMessage());
}

INFO: persistOne - Enter
INFO: 2
INFO: 3
INFO: IS ACTIVE
INFO: [EL Warning]: 2012-01-06 14:45:59.221--UnitOfWork(12492659)--java.lang.IllegalStateException: During synchronization a new object was found through a relationship that was not marked cascade PERSIST: com.maze.model.UserDetail@d52ea.

WARNING: #{accountController.performRegister}: java.lang.IllegalStateException: 
Exception Description: No transaction is currently active
javax.faces.FacesException: #{accountController.performRegister}: java.lang.IllegalStateException: 
Exception Description: No transaction is currently active
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
    at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:662)
Caused by: javax.faces.el.EvaluationException: java.lang.IllegalStateException: 
Exception Description: No transaction is currently active
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    ... 32 more
Caused by: java.lang.IllegalStateException: 
Exception Description: No transaction is currently active
    at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.rollback(EntityTransactionImpl.java:122)
    at com.maze.service.UserService.persistOne(UserService.java:63)
    at com.maze.controller.request.AccountController.performRegister(AccountController.java:62)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.sun.el.parser.AstValue.invoke(AstValue.java:234)
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
    ... 33 more

奇怪的是，事务处于活动状态，但接下来发生的是不活动的错误

编辑 EntityManager单例： 公共类实体管理器单体{

private EntityManagerSingleton(){
}

private static class EMSingletonHolder{
    private static final EntityManagerFactory emf = Persistence.createEntityManagerFactory("Maze");
    private static final EntityManager em = emf.createEntityManager();
}

public static EntityManager getInstance(){
    return EMSingletonHolder.em;
}

*获取em实例：*

public abstract class AbstractService {
protected EntityManager em;

public AbstractService(){
    em = EntityManagerSingleton.getInstance();
}
}

---

所有其他服务都扩展了AbstractService

根据您的日志判断，您正在使用GlassFish。我假设您也在使用JTA。也许您还可以提供获取EntityManager实例的代码？此外，使用System.out语句进行调试是过去的事情，请使用调试器，否则您的代码很难读取。此外，你的缩进是错的

首先，如果您正在使用JTA，请查看以下问题：

引用公认的答案：

在Java EE管理的上下文中获取对与EntityManager关联的EntityTransaction实例的引用是非法的 EntityManager.getTransaction（）的Java EE API文档：

返回资源级别EntityTransaction对象 EntityTransaction实例可以串行用于开始和提交 多重交易

这就是为什么如果您希望得到任何帮助，那么提供有关获取实体管理器的代码/注入的信息是很重要的

另外，为了代码的可读性，您不应该多次调用em.getTransaction（）； 您应该将第一个调用分配给事务对象并重用它，有点像这样：

//GOOD cause readable
EntityTransaction tx = em.getTransaction();
tx.begin();
em.persist(someObject);
tx.commit();

而不是

 //BAD cause hard to read
 em.getTransaction().begin();
 em.persist(someObject);
 em.getTransaction().commit(); //NO!

---

如果你看最后一个堆栈轨迹，我明白了

    at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.rollback(EntityTransactionImpl.java:122)

---

这是回滚过程中的错误，而不是提交过程中的错误。我想知道这是否与非持久化对象的警告有关；在提交结束时出现了一些错误，以至于您的框架尝试回滚时为时已晚。我打赌，如果您正确注册了

UserDetail

对象，那么问题将不会出现uld清除。

请注意，最后一个异常是由catch块中的

rollback（）

引发的

因此，

commit（）

引发以下异常：

java.lang.IllegalStateException:同步期间，通过未标记为cascade PERSIST:com.maze.model的关系找到了一个新对象。UserDetail@d52ea.

该异常会导致隐式回滚，因此catch块中的手动

rollback（）

会由于非活动事务引发另一个异常

---

为了进行可靠的手动清理，在调用catch块中的

rollback（）

之前，您需要检查事务是否处于活动状态。

您的日志解释说，在提交期间，Eclipselink发生异常并回滚您的事务。这就是您的事务不再处于活动状态的原因

信息：[EL警告]：2012-01-06 14:45:59.221——UnitOfWork（12492659）——java.lang.IllegalStateException: 在同步过程中，通过关系找到了一个新对象 没有标记为cascade PERSIST:com.maze.model。UserDetail@d52ea.

---

我会注意这一点-

在同步过程中，通过未标记为cascade PERSIST的关系找到了一个新对象。

。您可以找到我的解决方案。我使用的是resource\u local而不是jt。在资源本地实体管理器的上下文中，您文章的最后一点似乎是错误的。没有理由不调用getTransaction多次获得当前事务。EntyMealm是单线程的，SPEC显式地显示了一个这样做的例子。@ Chrman语料库I是代码可读性的术语。考虑到您需要继续保存4个对象。“4次以上？还是更喜欢”tx.persist（someObject）“？在第一种方法中，每一行读作做2个操作：获取事务，持久化对象。而实际上，您想说的是‘持久化对象’。@baba事务是EntityManager的一部分，您使用EntityManager而不是事务来持久化。em.getTransaction（）.begin（）；em.persist（obj1）；em.persist（obj2）；em.getTransaction（）.commit（）；@chromanoid不管怎样，如果在代码中有回滚或类似的东西，那么只使用一次事务实例而不是执行em.getTransaction（）看起来要干净得多.X.它更具可读性，表明我们调用的是事务，而不是em。我坚持我所说的，在可读性方面，将事务分配给某个对象，然后再重用它要好得多，即使我们讨论的是两种重用。OP的代码是一个清楚的例子，说明了除了格式化之外，事物不应该是什么样子和其他东西，如果按照我建议的方式制作的话，它将受益匪浅。