java - 如何在 TeamCenter 富客户端中使用 Qt Jambi 初始化 QApplication

Question

1. 我可以使用 GUI 独立运行“HelloWorld1”Qt-Jambi 应用程序。

2. 我可以运行继承 ViewPart 的“HelloWorld2”teamcenter-plugin(通过 Eclipse)。

3. 尝试在插件中初始化QApplication，如下所示:

   公共(public)类 MyComView 扩展了 ViewPart{静止的{//尝试初始化Qt-Jambi//System.out.println("QQ==加载qtjambi之前");//QApplication qap1 = QApplication.instance();//System.out.println("QQ==获取实例后");}//...}

我的代码编译和链接得很好。但我有一个 java.lang.ClassNotFoundException 错误，堆栈跟踪如下:

!STACK 0
java.lang.NoClassDefFoundError: com/trolltech/qt/gui/QApplication
    at com.mycom.myview.views.MyComView.<clinit>(MyComView.java:89)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at java.lang.Class.newInstance0(Unknown Source)
    at java.lang.Class.newInstance(Unknown Source)
    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:170)
    at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:874)
    at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
    at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:51)
    at org.eclipse.ui.internal.WorkbenchPlugin$1.run(WorkbenchPlugin.java:267)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
    at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:263)
    at org.eclipse.ui.internal.registry.ViewDescriptor.createView(ViewDescriptor.java:63)
    at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:324)
    at org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:226)
    at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
    at org.eclipse.ui.internal.Perspective.showView(Perspective.java:2228)
    at org.eclipse.ui.internal.WorkbenchPage.busyShowView(WorkbenchPage.java:1067)
    at org.eclipse.ui.internal.WorkbenchPage$20.run(WorkbenchPage.java:3816)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
    at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3813)
    at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3789)
    at com.cals.testplugin2.handlers.CallMyViewPart.execute(CallMyViewPart.java:26)
    at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:294)
    at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476)
    at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)
    at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169)
    at org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(SlaveHandlerService.java:241)
    at org.eclipse.ui.menus.CommandContributionItem.handleWidgetSelection(CommandContributionItem.java:770)
    at org.eclipse.ui.menus.CommandContributionItem.access$10(CommandContributionItem.java:756)
    at org.eclipse.ui.menus.CommandContributionItem$5.handleEvent(CommandContributionItem.java:746)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3880)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3473)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at com.teamcenter.rac.aifrcp.Application.runApplication(Unknown Source)
    at com.teamcenter.rac.aifrcp.Application.start(Unknown Source)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
    at org.eclipse.equinox.launcher.Main.main(Main.java:1287)
Caused by: java.lang.ClassNotFoundException: com.trolltech.qt.gui.QApplication
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:489)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:405)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:393)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:105)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClassInternal(Unknown Source)
    ... 59 more

我做错了什么？如何在 Eclipse-RCP 中(尤其是在 Teamcenter 插件中)正确使用 Qt-Jambi？

Answer 1

java.lang.NoClassDefFoundError 可能因多种原因而引发。代码编译得很好，但在运行时抛出异常。

如果您在 .jar 文件中从命令行运行它，则它可能未在 jar 文件的 list 中列出。

如果您在 Eclipse 中运行它，请检查您的类路径，或者确保可以在工作目录中找到该类。

com/trolltech/qt/gui/QApplication 取决于 native 库代码，因此请确保您的类路径或工作目录具有 Qt Jambi native 库。