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我正在運行一個使用EclipseLink的Web服務，它的效果很好。但有時候我會得到一個異常，提示「無法預先部署PersistenceUnit」。我不知道爲什麼我得到這個。其他一切似乎都起作用，並且這個例外似乎不會影響應用程序，它只是被捉住了。我得到一個PersistenceException，我不明白爲什麼
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
在例外，我能找到一絲線的方法：
EntityManagerFactory emf = Persistence.createEntityManagerFactory("MyLibPU");
爲什麼會出現呢？
編輯
這是輸出時的EclipseLink日誌記錄設置爲FINEST我得到。
[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.....
EDIT 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>
有更多的例外嗎？ EclipseLink在創建持久性單元時出錯，所以如果沒有更多的錯誤，您需要將日誌記錄轉換爲最佳狀態以查找更多信息：
@克里斯：對不起，回覆晚了。在上面的文章中查看我的編輯，當EclipseLink日誌記錄設置爲FINEST時，您將輸出結果。你會在我上面的編輯中看到整個異常。你能弄清楚問題是什麼？我不能。 =/ – Rox 2012-04-24 07:08:17
即使在編輯之後，應該有更多堆棧跟蹤。檢查服務器。任何方式發佈您的'persistence.xml'。那裏有什麼不對。甚至可能是無法解析的無效XML。 – Shahzeb 2012-04-24 07:13:12