使用 Eclipse 的 MTA (MIGRATION TOOLKIT FOR APPLICATIONS 6.2)插件分析应用程序时遇到错误

Question

我在按照下面网站的安装使用步骤在Eclipse IDE上进行MTA的插件安装，但是在安装完了以后使用的时候Eclipse IDE报出错误信息 有没有用过MTA的插件的 想请问是不是我哪里执行的步骤不对

●安装使用步骤网站
https://access.redhat.com/documentation/zh-cn/migration_toolkit_for_applications/6.2/html/eclipse_plugin_guide/analyzing-projects-with-plugin_eclipse-code-ready-studio-guide

●执行的步骤
1、 下载 eclipse (https://www.eclipse.org/downloads/packages/release/2023-03/r)

2、 安装和配置 OpenJDK 17（在 Windows 上）（https://openjdk.org/projects/jdk/）

3、 JBoss Tools，从 Eclipse Marketplace里安装

4、 Mylyn SDK 和框架，从 Eclipse Marketplace里安装

5、 MTA6.2.0，从 Eclipse Install New Software里安装

6、 访问 MTA 工具

7、 创建运行配置
8、 在 Issue Explorer 中，点 MTA 图标( MTA button )创建运行配置的时候弹框报错了

●错误信息
java.lang.NullPointerException: Cannot invoke "org.jboss.tools.windup.model.domain.ModelService.getModel()" because "this.modelService" is null
at org.jboss.tools.windup.ui.internal.launch.WindupInputTab.buildMigrationPaths(WindupInputTab.java:389)
at org.jboss.tools.windup.ui.internal.launch.WindupInputTab.createMigrationPathGroup(WindupInputTab.java:376)
at org.jboss.tools.windup.ui.internal.launch.WindupInputTab.createControl(WindupInputTab.java:87)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.showInstanceTabsFor(LaunchConfigurationTabGroupViewer.java:921)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.displayInstanceTabs(LaunchConfigurationTabGroupViewer.java:846)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.lambda$4(LaunchConfigurationTabGroupViewer.java:728)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.inputChanged(LaunchConfigurationTabGroupViewer.java:743)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.setInput0(LaunchConfigurationTabGroupViewer.java:675)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.setInput(LaunchConfigurationTabGroupViewer.java:655)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog.handleLaunchConfigurationSelectionChanged(LaunchConfigurationsDialog.java:1049)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog.lambda$1(LaunchConfigurationsDialog.java:612)
at org.eclipse.jface.viewers.StructuredViewer$3.run(StructuredViewer.java:821)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:174)
at org.eclipse.jface.viewers.StructuredViewer.firePostSelectionChanged(StructuredViewer.java:818)
at org.eclipse.jface.viewers.StructuredViewer.setSelection(StructuredViewer.java:1661)
at org.eclipse.jface.viewers.TreeViewer.setSelection(TreeViewer.java:1090)
at org.eclipse.jface.viewers.Viewer.setSelection(Viewer.java:376)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog.doInitialTreeSelection(LaunchConfigurationsDialog.java:658)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog.initializeContent(LaunchConfigurationsDialog.java:1185)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog.createContents(LaunchConfigurationsDialog.java:473)
at org.eclipse.jface.window.Window.create(Window.java:431)
at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1094)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog.create(LaunchConfigurationsDialog.java:378)
at org.eclipse.jface.window.Window.open(Window.java:788)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog.open(LaunchConfigurationsDialog.java:1238)
at org.jboss.tools.windup.ui.internal.editor.CreateRunConfigurationHandler.execute(CreateRunConfigurationHandler.java:56)
at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:283)
at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:97)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:58)
at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:317)
at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:251)
at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:173)
at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:156)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:488)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:485)
at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:213)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.executeItem(HandledContributionItem.java:438)
at org.eclipse.e4.ui.workbench.renderers.swt.AbstractContributionItem.handleWidgetSelection(AbstractContributionItem.java:449)
at org.eclipse.e4.ui.workbench.renderers.swt.AbstractContributionItem.lambda$2(AbstractContributionItem.java:475)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4256)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1066)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4054)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3642)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1155)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1046)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:643)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:550)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:171)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:136)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:402)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:659)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:596)
at org.eclipse.equinox.launcher.Main.run(Main.java:1467

Answer 1

以下内容由CHATGPT及阿里嘎多学长共同生成、有用望采纳：

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根据您提供的错误信息和执行步骤，这个NullPointerException通常是由于在尝试访问一个未被正确初始化的对象时发生的。在这种情况下，this.modelService应该是一个在WindupInputTab类中被初始化的成员变量，但在调用getModel()方法时，它却是null。

要解决这个问题，您可以尝试以下步骤：

1. 确认插件安装：确保MTA插件及其所有依赖项都已正确安装。有时候，如果插件安装不完整或某些依赖项缺失，可能会导致运行时错误。

2. 检查Eclipse配置：确认您的Eclipse IDE配置正确，包括JDK版本和其他相关设置。

3. 查看Eclipse日志：Eclipse IDE通常会记录更详细的错误信息在日志文件中。检查Eclipse的日志文件，可能会有更多关于为什么this.modelService为null的线索。

4. 尝试清理和重建：有时候，简单的清理和重建Eclipse工作空间可以解决一些难以追踪的问题。

5. 更新Eclipse和插件：确保您的Eclipse IDE和所有插件都是最新版本。有时候，开发者会在新版本中修复已知的错误。

6. 搜索类似的问题：搜索社区论坛、问题追踪系统或Stack Overflow等网站，看看是否有其他用户遇到过类似的问题，并找到了解决方案。

7. 联系支持：如果上述步骤都不能解决问题，您可能需要联系Red Hat或Eclipse社区的支持，以获得更专业的帮助。

关于代码实现，由于这是一个运行时错误，通常不需要特定的代码来解决。修复这个问题的关键是找到为什么this.modelService没有被初始化的原因。

至于参考资料，您可以参考以下链接：

• Eclipse官方文档：Eclipse Official Documentation
• Red Hat关于MTA的文档：Red Hat MTA Documentation
• Stack Overflow上的相关讨论：Stack Overflow

如果您需要进一步的帮助，建议提供更多的上下文信息，例如Eclipse的完整日志文件，这样可能会更容易找到问题的根本原因。