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我在使用 Toplink Essentials作为持久性提供程序的 Java 桌面应用程序中遇到了一个奇怪的行为。

我有一个目录，其中包含我的应用程序所需的所有内容：一个 jar、一个 lib 文件夹和一个 JavaDB 数据库。整个目录是独立的（我复制了几次都没有问题，即使在不同的计算机之间）。

今天我想再复制一次，但我的目标文件夹包含一个德语变音符号 ü (html: ü)。

启动我的应用程序失败，有一个例外是很难找到原因（见下文）。

我当然知道旧的命名约定，但我认为我们已经把它抛在脑后了。所以我的问题是，是否有办法让它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并且对安装目录的影响很小。

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
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1 回答 1

2

奇怪的。你用的是什么JVM？

确保您拥有最新的 TopLink Essentials 补丁，我记得有空格问题，但不是 Umlats。

您也可以尝试升级到 EclipseLink 并查看是否发生相同的问题，如果确实发生，请记录错误。

于 2011-03-29T13:42:29.140 回答