PersistenceException和路徑中的變音符號

Question

我遇到了一個奇怪的行爲，使用Toplink essentials作爲持久性提供程序的java桌面應用程序。

我有一個包含我的應用程序所需的全部目錄：jar，lib文件夾和JavaDB數據庫。整個目錄是獨立的（我幾次複製它沒有問題，甚至在不同的計算機之間）。

今天我想複製一次，但我的目標文件夾中包含一個德國元音ü（HTML：ü）。

啓動我的應用程序失敗，但有一個例外，這使得很難找到原因（見下文）。

當然我知道舊的命名約定，但我認爲我們已經把它留下了。所以我的問題是，如果有一種獨立於目錄命名的方式運行。這很重要，因爲我想將應用程序交給客戶，並且對安裝目錄影響很小。

系統：Windows 7，JavaDB 10.5.3

在此先感謝您的幫助！

SCHWERWIEGEND: Application class jlabps.JLabPSApp failed to launch 
javax.persistence.PersistenceException: No Persistence provider for EntityManage 
r named JLAPS_EMB: The following providers: 
oracle.toplink.essentials.PersistenceProvider 
oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider 
Returned null to createEntityManagerFactory. 

     at javax.persistence.Persistence.createEntityManagerFactory(Persistence. 
java:154) 
     at jlabps.JLabPSView.initComponents(JLabPSView.java:401) 
     at jlabps.JLabPSView.<init>(JLabPSView.java:47) 
     at jlabps.JLabPSApp.startup(JLabPSApp.java:71) 
     at org.jdesktop.application.Application$1.run(Application.java:171) 
     at java.awt.event.InvocationEvent.dispatch(Unknown Source) 
     at java.awt.EventQueue.dispatchEventImpl(Unknown Source) 
     at java.awt.EventQueue.access$000(Unknown Source) 
     at java.awt.EventQueue$1.run(Unknown Source) 
     at java.awt.EventQueue$1.run(Unknown Source) 
     at java.security.AccessController.doPrivileged(Native Method) 
     at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown 
Source) 
     at java.awt.EventQueue.dispatchEvent(Unknown Source) 
     at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) 
     at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) 
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) 
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
     at java.awt.EventDispatchThread.run(Unknown Source) 
Exception in thread "AWT-EventQueue-0" java.lang.Error: Application class jlabps 
.JLabPSApp failed to launch 
     at org.jdesktop.application.Application$1.run(Application.java:177) 
     at java.awt.event.InvocationEvent.dispatch(Unknown Source) 
     at java.awt.EventQueue.dispatchEventImpl(Unknown Source) 
     at java.awt.EventQueue.access$000(Unknown Source) 
     at java.awt.EventQueue$1.run(Unknown Source) 
     at java.awt.EventQueue$1.run(Unknown Source) 
     at java.security.AccessController.doPrivileged(Native Method) 
     at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown 
Source) 
     at java.awt.EventQueue.dispatchEvent(Unknown Source) 
     at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) 
     at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) 
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) 
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
     at java.awt.EventDispatchThread.run(Unknown Source) 
Caused by: javax.persistence.PersistenceException: No Persistence provider for E 
ntityManager named JLAPS_EMB: The following providers: 
oracle.toplink.essentials.PersistenceProvider 
oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider 
Returned null to createEntityManagerFactory. 

     at javax.persistence.Persistence.createEntityManagerFactory(Persistence. 
java:154) 
     at jlabps.JLabPSView.initComponents(JLabPSView.java:401) 
     at jlabps.JLabPSView.<init>(JLabPSView.java:47) 
     at jlabps.JLabPSApp.startup(JLabPSApp.java:71) 
     at org.jdesktop.application.Application$1.run(Application.java:171) 
     ... 14 more 

Answer 1

奇數。你在使用什麼JVM？

確保您擁有最新的TopLink Essentials修補程序，我記得空間問題，但不是Umlats。

你也可以嘗試升級到EclipseLink並查看是否出現同樣的問題，如果確實存在，請記錄一個錯誤。