我遇到了这种异常，但是我无法理解那里发生了什么。
因为在编译时我的班级可以访问apache POI类，但是在运行时我的班级抛出了他找不到的异常org.apache.poi.xssf.usermodel.XSSFWorkbook。
到现在为止，无论网上提供什么解决方案，我都尝试了一切，但仍不了解自己所缺少的内容。
奇怪的是，在我朋友的日食中使用相同的代码和相同的Apache POI库。我们都有相同的项目。不明白那里发生了什么。
我检查了我引用库的所有文件夹的访问权限。
如果您有任何建议，请分享。
我收到以下异常。
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.NoClassDefFoundError: org/apache/poi/xssf/usermodel/XSSFWorkbook
at com.herzog.pmide.mergedconfigxml.ui.editors.DocumentGenerator.prepareScadaIOListExcel(DocumentGenerator.java:94)
at com.herzog.pmide.mergedconfigxml.ui.editors.DocumentGenerator.scadaIOList(DocumentGenerator.java:77)
at com.herzog.pmide.mergedconfigxml.ui.actions.DocumentGeneratorAction.run(DocumentGeneratorAction.java:47)
at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:253)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:595)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:511)
at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:420)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4353)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1061)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4172)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3761)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1151)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:331)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1032)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:148)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:636)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:331)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:579)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
at com.herzog.pmide.application.Application.start(Application.java:20)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:648)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603)
at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
at org.eclipse.equinox.launcher.Main.main(Main.java:1438)
Caused by: java.lang.ClassNotFoundException: org.apache.poi.xssf.usermodel.XSSFWorkbook cannot be found by com.herzog.pmide.mergedconfigxml.ui_1.0.0.qualifier
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:432)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:345)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:337)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:160)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
MANIFEST.MF如下
Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: Ui
Bundle-SymbolicName: com.herzog.pmide.mergedconfigxml.ui;singleton:=true
Bundle-Version: 1.0.0.qualifier
Bundle-Activator: com.herzog.pmide.mergedconfigxml.ui.Activator
Bundle-Vendor: Example
Require-Bundle: org.eclipse.ui,
org.eclipse.core.runtime,
org.eclipse.core.resources,
org.eclipse.emf.ecore.xmi,
org.eclipse.emf.edit.ui,
com.herzog.pmide.machinelib.model.edit,
org.eclipse.ui.forms,
org.eclipse.ui.workbench,
org.eclipse.ui.ide,
com.herzog.pmide.mergedconfigxml.model.edit,
org.eclipse.gef,
com.herzog.pmide.tools.importutility,
com.herzog.pmide.machinelib.model,
org.eclipse.swt,
org.eclipse.emf.query,
com.herzog.pmide.mergedconfigxml.model,
org.eclipse.ui.editors,
org.eclipse.emf.validation,
org.eclipse.emf.validation.ui,
org.slf4j.api,
org.junit,
org.eclipse.emf.compare,
org.eclipse.emf.compare.edit,
org.eclipse.emf.compare.ide.ui,
org.eclipse.compare,
org.apache.commons.io,
org.eclipse.core.filesystem,
de.vonloesch.pdf4Eclipse,
de.vonloesch.pdf4eclipse.help,
com.herzog.pmide.routingline.model
Bundle-ActivationPolicy: lazy
Bundle-ClassPath: .
Export-Package: com.herzog.pmide.mergedconfigxml.ui,
com.herzog.pmide.mergedconfigxml.ui.editors.unitconfig,
com.herzog.pmide.mergedconfigxml.ui.views
Bundle-Localization: OSGI-INF/l10n/message
build.properties如下
source.. = src/
output.. = bin/
bin.includes = META-INF/,\
.,\
plugin.xml,\
icons/,\
OSGI-INF/l10n/message.properties
最佳答案
插件只能访问捆绑包类路径中包含的其他插件或该插件包含的jar中的类。设置Java构建路径属性不能正确配置插件。
将您需要的所有jar添加到插件中，通常将它们放在“ lib”目录中。
更新build.properties以将这些jar包含在“ bin.includes”部分中。例如：
source.. = src/
output.. = bin/
bin.includes = META-INF/,\
.,\
plugin.properties,\
plugin.xml,\
lib/,\
lib/jogg-0.0.7.jar,\
lib/jorbis-0.0.15.jar,\
lib/vorbisspi1.0.2.jar
在这里，我在lib目录中有3个jar（不是POI jar，这只是我的一个项目中的示例）。
更新MANIFEST.MF并将
Bundle-Classpath设置为包含jar。您可以在“类路径”部分“运行时”选项卡中的MANIFEST.MF编辑器中执行此操作（使用列表右侧的“添加...”按钮，然后在插件中选择库）。确保将条目保留为“。”。您的MANIFEST.MF应该最终包含“ Bundle-Classpath”条目，如下所示：Bundle-ClassPath: .,
lib/jogg-0.0.7.jar,
lib/jorbis-0.0.15.jar,
lib/vorbisspi1.0.2.jar
关于java - java.lang.NoClassDefFoundError:org/apache/poi/xssf/usermodel/XSSFWorkbook，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/44193879/