我得到一个PersistenceException，我不明白为什么

时间：2012-04-20 07:18:59

标签： java exception java-ee jpa eclipselink

我正在使用EclipseLink运行Web服务，它运行良好。但有时我得到一个例外，说“无法预先部署PersistenceUnit”。我不知道为什么我得到这个。其他一切似乎都有效，而这个例外似乎并没有打扰到应用程序，它只是被捕获了。

Exception Description: Unable to predeploy PersistenceUnit [MyLibPU] in invalid state [Undeployed]
javax.persistence.PersistenceException: Exception [EclipseLink-28017] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Unable to predeploy PersistenceUnit [MyLibPU] in invalid state [Undeployed]
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:956)
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:121)
    at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source)
    at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source)
....
....
Caused by: Exception [EclipseLink-28017] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Unable to predeploy PersistenceUnit [MyLibPU] in invalid state [Undeployed]
    at org.eclipse.persistence.exceptions.EntityManagerSetupException.cannotPredeploy(EntityManagerSetupException.java:202)
    ... 30 more

在异常中，我可以找到方法中某一行的跟踪：

EntityManagerFactory emf = Persistence.createEntityManagerFactory("MyLibPU");

为什么我会这样做？

修改
这是eclipselink日志记录设置为FINEST时得到的输出。

[EL Finest]: 2012-04-23 15:19:06.025--ServerSession(2134178364)--Thread(Thread[Finalizer,8,system])--End undeploying Persistence Unit MyLibPU; session file:/home/Rox/MyLib/trunk/MyLib/build/classes/_MyLibPU; state Undeployed; factoryCount 0
[EL Finest]: 2012-04-23 15:19:06.025--ServerSession(2113649746)--Thread(Thread[Finalizer,8,system])--Begin undeploying Persistence Unit MyLibPU; session file:/home/Rox/MyLib/trunk/MyLib/src/_MyLibPU; state Deployed; factoryCount 3
[EL Finest]: 2012-04-23 15:19:06.025--ServerSession(2113649746)--Thread(Thread[Finalizer,8,system])--End undeploying Persistence Unit MyLibPU; session file:/home/Rox/MyLib/trunk/MyLib/src/_MyLibPU; state Deployed; factoryCount 2
Apr 23, 2012 3:19:06 PM com.sun.xml.internal.ws.server.sei.EndpointMethodHandler invoke
SEVERE: Exception [EclipseLink-28017] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Unable to predeploy PersistenceUnit [MyLibPU] in invalid state [Undeployed]
javax.persistence.PersistenceException: Exception [EclipseLink-28017] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Unable to predeploy PersistenceUnit [MyLibPU] in invalid state [Undeployed]
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:956)
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:121)
    at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source)
    at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source)
    at com.mylib.MyImplementation.getPersons(MyImplementation.java:171)
    at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.sun.xml.internal.ws.api.server.InstanceResolver$1.invoke(InstanceResolver.java:235)
    at com.sun.xml.internal.ws.server.InvokerTube$2.invoke(InvokerTube.java:135)
    at com.sun.xml.internal.ws.server.sei.EndpointMethodHandler.invoke(EndpointMethodHandler.java:246)
    at com.sun.xml.internal.ws.server.sei.SEIInvokerTube.processRequest(SEIInvokerTube.java:85)
    at com.sun.xml.internal.ws.api.pipe.Fiber.__doRun(Fiber.java:626)
    at com.sun.xml.internal.ws.api.pipe.Fiber._doRun(Fiber.java:585)
    at com.sun.xml.internal.ws.api.pipe.Fiber.doRun(Fiber.java:570)
    at com.sun.xml.internal.ws.api.pipe.Fiber.runSync(Fiber.java:467)
    at com.sun.xml.internal.ws.server.WSEndpointImpl$2.process(WSEndpointImpl.java:299)
    at com.sun.xml.internal.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:593)
    at com.sun.xml.internal.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:244)
    at com.sun.xml.internal.ws.transport.http.server.WSHttpHandler.handleExchange(WSHttpHandler.java:95)
    at com.sun.xml.internal.ws.transport.http.server.WSHttpHandler.handle(WSHttpHandler.java:80)
    at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:77)
    at sun.net.httpserver.AuthFilter.doFilter(AuthFilter.java:83)
    at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:80)
    at sun.net.httpserver.ServerImpl$Exchange$LinkHandler.handle(ServerImpl.java:668)
    at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:77)
    at sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:640)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)
Caused by: Exception [EclipseLink-28017] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Unable to predeploy PersistenceUnit [MyLibPU] in invalid state [Undeployed]
    at org.eclipse.persistence.exceptions.EntityManagerSetupException.cannotPredeploy(EntityManagerSetupException.java:202)
    ... 30 more

[EL Finer]: 2012-04-23 15:20:06.003--Thread(Thread[pool-1-thread-61,5,main])--fixUNC: before fixing: url = file:/home/Rox/MyLib/build/classes/, authority = , file = /home/Rox/MyLib/build/classes/ (There is no English translation for this message.)
[EL Finer]: 2012-04-23 15:20:06.012--Thread(Thread[pool-1-thread-61,5,main])--fixUNC: after fixing: url = file:/home.....

编辑2
我的persistence.xml：

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
  <persistence-unit name="MyLibPU" transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <class>com.mylib.Person</class>
    <class>com.mylib.Group</class>
    <properties>
      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/MY_DB"/>
      <property name="javax.persistence.jdbc.password" value="MyPassword"/>
      <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
      <property name="javax.persistence.jdbc.user" value="root"/>
      <property name="eclipselink.logging.level" value="FINEST"/>;
      <property name="eclipselink.logging.level.sql" value="FINEST"/>;
      <property name="eclipselink.logging.parameters" value="true"/>;
    </properties>
  </persistence-unit>
</persistence>

3 个答案:

答案 0 :(得分：1)

如果错误是零星的，也许这意味着这是一个时间问题。此外，显然您在应用程序的生命周期中多次创建工厂（如果我错了，请告诉我）。因此，对您的Web应用程序的并发请求会触发并发创建工厂。可能不支持此案例。

最好只创建一次工厂。有关如何操作，请参阅this question。然后你可以同时调用createEntityManager - 这个方法是线程安全的。

答案 1 :(得分：0)

取消部署Hibernate存在问题。当您尝试取消部署和重新部署时，看起来您正在遇到它们。完成服务器重启后是否有问题？

编辑：对不起，您明确表示您正在使用EclipseLink，不知道为什么我认为您使用的是Hibernate。

无论如何，日志中的这一行令人担忧：

[EL Finest]: 2012-04-23 15:19:06.025--ServerSession(2113649746)--Thread(Thread[Finalizer,8,system])--Begin undeploying Persistence Unit MyLibPU; session file:/home/Rox/MyLib/trunk/MyLib/src/_MyLibPU; state Deployed; factoryCount 3

我不确定factoryCount是什么意思，但我不喜欢它是＆gt;但最令人担忧的是“开始取消部署持久性单元MyLibPU”。为什么PU被取消部署？我认为这是因为你没有使用应用程序，但在你的评论中你说“错误可以在应用程序的生命周期中的任何时间发生，并且每24小时只发生2-5次。”在这种情况下，您需要确定触发取消部署的内容。

答案 2 :(得分：0)

使用数据库时，请勿使用静态构造函数或类似构造。这可以避免麻烦。尝试在代码中插入暂停和显式日志命令，以查找错误以查找代码的运行距离。

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