JPA目前沒有交易

使用JPA和EclipseLink實現。JPA目前沒有交易

代碼：

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()); 
}

錯誤：

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: [email protected] 

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，本次交易活躍，但發生接下來的事情是不活躍的一個錯誤。

編輯 的EntityManager辛格爾頓： 公共類EntityManagerSingleton {

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; 
}

*獲取EM實例：*

public abstract class AbstractService { 
protected EntityManager em; 

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

所有其他服務擴展了AbstractService

來源

2012-01-06 TGM

我會注意這一點 - 「同步期間，通過未標記級聯PERSIST'的關係找到一個新對象。 – Perception 2012-01-06 13:10:01

根據你的日誌來判斷，你正在使用GlassFish。我假設你也在使用JTA。也許你也可以提供獲取EntityManager實例的代碼？此外，使用System.out語句進行調試是過去的事情，請使用調試器，否則您的代碼很難閱讀。另外，你的縮進是錯誤的。

首先，如果你使用JTA，來看看這個問題：

EJBException when calling entityManager.getTransaction()

報價從接受的答案：

It is illegal to obtain a reference to the EntityTransaction instance associated with the EntityManager in a Java EE managed context. From the Java EE API documentation of EntityManager.getTransaction():

Return the resource-level EntityTransaction object. The EntityTransaction instance may be used serially to begin and commit multiple transactions.

Returns: 
    EntityTransaction instance Throws: 
    IllegalStateException - if invoked on a JTA entity manager

這就是爲什麼如果您希望提供任何幫助，以提供有關通過您獲取實體經理的代碼/注入的信息。另外，爲了代碼可讀性，您不應該對em.getTransaction（）;進行多次調用。您應該在第一次調用分配給交易對象，並重新使用它，有點像這樣：

//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!

來源

2012-01-06 13:09:34

我正在使用resource_local而不是JTA – TGM 2012-01-06 14:01:17

您的文章的最後一點似乎是在資源本地實體管理器的上下文中是錯誤的。沒有理由不多次調用getTransaction來獲取當前事務。 EntityManager是單線程的，並且該規範明確顯示了一個可以這樣做的例子。 – chromanoid 2013-02-23 16:01:43

@chromanoid我的意思是它的代碼可讀性。考慮你需要堅持4個對象。你會叫'em.getTransaction（）。persist（someObject）'多4次嗎？或者你更喜歡'tx.persist（someObject）'？在第一種方法中，每行都會讀爲2個動作：獲取事務，堅持對象。而實際上你想說的是'堅持對象'。 – 2013-02-23 20:23:20

如果你看看過去的這些堆棧跟蹤，我看到

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

這是回滾期間的錯誤，而不是在提交期間。我想知道這是否與關於非穿透對象的警告有關;在提交結束時出現錯誤，這樣您的框架就會嘗試回滾，因爲這樣做太遲了。我敢打賭，如果你正確地註冊了這個對象，問題就會消失。

來源

2012-01-06 13:10:37

請注意，最後一個異常在catch塊中由rollback()引發。

所以，commit()拋出以下異常：

java.lang.IllegalStateException: During synchronization a new object was found through a relationship that was not marked cascade PERSIST: [email protected]

這異常導致隱式回退，所以，在catch塊手動rollback()拋出另一個異常是由於活動的事務。

對於可靠的手動清理，您還需要在catch塊中調用rollback()之前檢查事務是否處於活動狀態。

來源

2012-01-06 13:11:11 axtavt

那麼，你的日誌解釋，在提交期間，Eclipselink得到了一個異常並回滾你的事務。這就是爲什麼你的轉換不再有效..

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: [email protected]

來源

2012-01-06 13:11:24

JPA目前沒有交易

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