如何从Eclipse可执行JAR中运行DataNucleus？

Question

如何在Eclipse可执行JAR中使用DataNucleus JPA运行独立的Google AppEngine项目？客户将运行它，因此需要打包。它访问本地文件系统，因此它不能是Web应用程序。我没有使用Maven，只是Eclipse Project＆gt;出口＆gt;可执行JAR（以及它制作的Ant脚本）。当然，它在Eclipse中运行时有效。当我运行JAR时，我收到以下DataNucleus错误：

  

引起：java.io.FileNotFoundException：rsrc：datanucleus-api-jdo-3.1.3.jar（系统找不到指定的文件）

     

引起：org.datanucleus.exceptions.NucleusException：读取清单文件“jar：rsrc：datanucleus-api-jdo-3.1.3.jar！/plugin.xml”时出错

     

javax.persistence.PersistenceException：尝试以下发现的实现后，“transactions-optional”发生显式持久性提供程序错误：org.datanucleus.api.jpa.PersistenceProviderImpl from provider：org.datanucleus.api.jpa。 PersistenceProviderImpl

完整堆栈跟踪

javax.persistence.PersistenceException: Explicit persistence provider error(s) occurred for "transactions-optional" after trying the following discovered implementations: org.datanucleus.api.jpa.PersistenceProviderImpl from provider: org.datanucleus.api.jpa.PersistenceProviderImpl
        at javax.persistence.Persistence.createPersistenceException(Persistence.java:242)
        at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:184)
        at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:70)
        at com.mwv.pic.dao.EMF.getInstance(EMF.java:26)
        at com.mwv.pic.dao.SecondaryDocumentsDao.isSecondaryDocumentUniqueByTitle(SecondaryDocumentsDao.java:80)
        at com.mwv.pic.dao.SecondaryDocumentsDao.addSecondaryDocument(SecondaryDocumentsDao.java:53)
        at com.mwv.Import.createSecondaryDocument(Import.java:294)
        at com.mwv.Import.importAllFiles(Import.java:234)
        at com.mwv.Main$6.run(Main.java:220)
        at java.lang.Thread.run(Unknown Source)
Caused by: org.datanucleus.exceptions.NucleusException: Error reading manifest file "jar:rsrc:datanucleus-api-jdo-3.1.3.jar!/plugin.xml"
        at org.datanucleus.plugin.NonManagedPluginRegistry.registerBundle(NonManagedPluginRegistry.java:482)
        at org.datanucleus.plugin.NonManagedPluginRegistry.registerExtensions(NonManagedPluginRegistry.java:219)
        at org.datanucleus.plugin.NonManagedPluginRegistry.registerExtensionPoints(NonManagedPluginRegistry.java:160)
        at org.datanucleus.plugin.PluginManager.<init>(PluginManager.java:65)
        at org.datanucleus.plugin.PluginManager.createPluginManager(PluginManager.java:427)
        at org.datanucleus.api.jpa.JPAEntityManagerFactory.<init>(JPAEntityManagerFactory.java:328)
        at org.datanucleus.api.jpa.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:91)
        at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:150)
        ... 8 more
Caused by: java.io.FileNotFoundException: rsrc:datanucleus-api-jdo-3.1.3.jar (The system cannot find the file specified)
        at java.util.zip.ZipFile.open(Native Method)
        at java.util.zip.ZipFile.<init>(Unknown Source)
        at java.util.zip.ZipFile.<init>(Unknown Source)
        at java.util.jar.JarFile.<init>(Unknown Source)
        at java.util.jar.JarFile.<init>(Unknown Source)
        at org.datanucleus.plugin.NonManagedPluginRegistry.registerBundle(NonManagedPluginRegistry.java:390)
        ... 15 more

代码，EMF.java：26

        instance = Persistence.createEntityManagerFactory("transactions-optional");

JAR文件内容

META-INF / MANIFEST.MF

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.8.4
Created-By: 1.7.0_17-b02 (Oracle Corporation)
Main-Class: org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader
Rsrc-Main-Class: com.mwv.Main
Rsrc-Class-Path: ./ google-api-services-drive-v2-rev107-1.16.0-rc.jar 
... a hundred JARs ...
Class-Path: .

Answer 1

这不是一个理想的解决方案，但我使用7-Zip管理器编辑了JAR文件，添加了main.bat和main.sh，并使用.zip扩展名重命名。用户隐式假定解压缩并运行批处理或shell脚本。该脚本如下所示：

  

java -cp ./:google-api-services-drive-v2-rev107-1.16.0-rc.jar:...:forms-1.3.0.jar com.mwv.Main

.bat文件是相同的，:替换为;。我刚刚复制了MANIFEST.MF（7-Zip中的 F4 编辑）并手动使用了一些Notepad ++ Kung Fu来制作巨型类路径。毫无疑问，Eclipse生成的Ant文件会被修改为自动包含脚本，但我还没有这样做。