4

我正在使用 EclipseLink 运行 Web 服务，它运行良好。但有时我会收到异常消息“无法预部署 PersistenceUnit”。我不知道为什么我会得到这个。其他一切似乎都正常，异常似乎并没有干扰应用程序，它只是被捕捉到了。

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，我可以在方法中找到对一行的跟踪：

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

为什么我会得到这个？

编辑
这是我在 eclipselink 日志记录设置为时得到的输出FINEST。

[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>
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3 回答 3

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可能会触发工厂的并发创建。这种情况可能不受支持。

无论如何，只创建一次工厂是好的。请参阅此问题以了解如何执行此操作。然后你可以同时调用createEntityManager它——这个方法是线程安全的。

于 2012-04-25T17:28:10.463 回答
0

取消部署 Hibernate 存在问题。当您尝试取消部署和重新部署时，您似乎遇到了它们。重新启动完整服务器时是否有问题？

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

无论如何，您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

我不确定是什么factoryCount意思，但我不喜欢它 > 1。不过，最令人担忧的是“开始取消部署 Persistence Unit MyLibPU”。为什么要取消部署 PU？我认为这是因为您正在取消部署该应用程序，但在您的评论中您说“错误可能在应用程序的生命周期内随时发生，并且每 24 小时仅发生 2-5 次。” 在这种情况下，您需要弄清楚是什么触发了取消部署。

于 2012-04-25T00:10:21.180 回答
0

使用数据库时不要使用静态构造函数或类似的构造。这可能会避免麻烦。尝试在您的代码中插入暂停和显式日志命令以查找错误以了解您的代码走了多远。

于 2012-04-30T12:54:20.327 回答