我不知道该怎么办了。我已经三天没有解决这个问题了。
我有一个OSGi捆绑包，在这个捆绑包中我创建了一个ExportOperation:
public void createExportOperation(IProject project, IPath buildLocation, IPath exportLocation) throws CoreException{
try {
FeatureExportInfo exportInfo = this.initExport(buildLocation, exportLocation, project);
exportInfo.qualifier = AdvancedFeatureExportOperation.getDateQualifier();
Job job = new AdvancedFeatureExportOperation(exportInfo, "Project Deployment");
job.setUser(true);
job.setRule(ResourcesPlugin.getWorkspace().getRoot());
job.schedule();
} catch (Exception exception) {
exception.printStackTrace();
}
}
AdvancedFeatureExportOperation只是一个包装器，它扩展了org.eclipse.pde.internal.core.exports.FeatureExportOperation
如果我在eclipse(OSGiHostConsole(中运行我的捆绑包，它就可以工作了。但是，如果我只在OSGi中单独启动捆绑包，那么在导出操作的最后一个步骤中，10分钟后，我的日志中会出现以下错误：
!ENTRY org.eclipse.core.jobs 4 2 2022-09-22 20:24:07.425
!MESSAGE An internal error occurred during: "Project Deployment".
!STACK 0
java.lang.NoClassDefFoundError: org/xml/sax/helpers/DefaultHandler
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:188)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClassHoldingLock(ClasspathManager.java:638)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:613)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:574)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:492)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:465)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:395)
at org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:35)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:461)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:188)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClassHoldingLock(ClasspathManager.java:638)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:613)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:574)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:492)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:465)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:395)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:464)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at org.eclipse.pde.internal.build.site.BuildTimeFeatureFactory.parseBuildFeature(BuildTimeFeatureFactory.java:79)
at org.eclipse.pde.internal.build.site.BuildTimeFeatureFactory.createFeature(BuildTimeFeatureFactory.java:50)
at org.eclipse.pde.internal.build.site.BuildTimeSite.createFeature(BuildTimeSite.java:469)
at org.eclipse.pde.internal.build.site.compatibility.FeatureReference.getFeature(FeatureReference.java:39)
at org.eclipse.pde.internal.build.site.BuildTimeSite.resolveFeatureReferences(BuildTimeSite.java:327)
at org.eclipse.pde.internal.build.site.BuildTimeSite.findFeature(BuildTimeSite.java:296)
at org.eclipse.pde.internal.build.site.BuildTimeSite.findFeature(BuildTimeSite.java:288)
at org.eclipse.pde.internal.build.BuildScriptGenerator.generateFeatures(BuildScriptGenerator.java:252)
at org.eclipse.pde.internal.build.BuildScriptGenerator.generate(BuildScriptGenerator.java:127)
at org.eclipse.pde.internal.core.exports.FeatureExportOperation.doExport(FeatureExportOperation.java:256)
at org.eclipse.pde.internal.core.exports.FeatureExportOperation.doExport(FeatureExportOperation.java:223)
at org.eclipse.pde.internal.core.exports.FeatureExportOperation.run(FeatureExportOperation.java:107)
at com.iisy.solvatio.studio.deployment.wizards.AdvancedFeatureExportOperation.run(AdvancedFeatureExportOperation.java:24)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
Caused by: java.lang.ClassNotFoundException: org.xml.sax.helpers.DefaultHandler cannot be found by org.eclipse.equinox.p2.publisher.eclipse_1.1.200.v20130516-1953
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:501)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
... 45 more
我安装了与eclipse中安装的捆绑包完全相同的捆绑包。所有依赖项都已完全归档。我甚至下载了额外的org.verit.osgi.bundles.org.apache.xmlcommons.full1.4.1-20150918.jar，其中将导出org.xml.ax.helpers.DefaultHandler，在我的捆绑包清单中，我将此捆绑包作为Require bundle。
它确实有效，但在eclipse中，我也不需要额外的捆绑包。因为我太绝望了，我甚至手动更改了bunlde org.eclipse.eequinox.p2.publisher.eclipse的清单文件，所以org.everit.osgi.bundles.org.apache.xmlcommons.full将被列为Require Bundle。
但不可能，你知道问题出在哪里吗？或者我怎么才能找到这个问题？非常感谢您的帮助！
解决方案是添加：
-Dorg.osgi.framework.system.packages.extra=javax.*,org.xml.sax,org.xml.sax.helpers -Dorg.osgi.framework.bootdelegation=javax.*,org.xml.sax,org.xml.sax.helpers
在shell中启动OSGi。在Eclipse中，它之所以有效，是因为它们不那么引人注目。我在阅读后找到了解决方案：https://developer.ibm.com/articles/osgi-demystified-part-2-unraveling-java-and-osgi-class-loader-problems/