我在使用Toplink要点作为持久性提供程序的Java桌面应用程序中遇到了奇怪的行为。
我有一个目录，其中包含应用程序所需的全部内容：一个jar，一个lib文件夹和一个JavaDB数据库。整个目录是独立的（即使在不同的计算机之间，我也多次复制它没有问题）。
今天，我想再次复制一次，但是我的目标文件夹中包含德语的Umlautü（html：ü）。
启动我的应用程序失败，但有一个异常使得它很难找到原因（见下文）。
我当然知道旧的命名约定，但是我认为我们已经把它抛在了后面。所以我的问题是，是否有一种方法可以使其独立于目录命名运行。这很重要，因为我想将应用程序提供给客户端，并且对安装目录几乎没有影响。
系统：Windows 7，JavaDB 10.5.3
在此先感谢您的帮助！
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
最佳答案
奇。您正在使用什么JVM？
确保您拥有最新的TopLink Essentials补丁，我记得空格存在问题，但Umlats没有。
您也可以尝试升级到EclipseLink，看看是否发生相同的问题，如果确实发生，请记录错误。