android - Eclipse 在创建 android junit 测试配置时抛出 java.lang.NullPointerException

Question

我在 Eclipse 中有 Android 项目。

我为我的项目创建了测试项目 尝试按照 Testing from Eclipse with ADT at developer.android.com 中的说明创建测试配置.

我的行为:

• 运行->运行配置
• 选择 Android JUnit 测试->新建
• 出现错误消息“发生错误。有关详细信息，请参阅错误日志。java.lang.NullPointerException”。

• 日志:

  Problems occurred when invoking code from plug-in: "org.eclipse.jface".
  
  java.lang.NullPointerException
  at com.android.ide.eclipse.adt.internal.launch.junit.InstrumentationRunnerValidator.<init>(InstrumentationRunnerValidator.java:48)
  at com.android.ide.eclipse.adt.internal.launch.junit.InstrumentationRunnerValidator.<init>(InstrumentationRunnerValidator.java:59)
  at com.android.ide.eclipse.adt.internal.launch.junit.AndroidJUnitLaunchConfigurationTab.loadInstrumentations(AndroidJUnitLaunchConfigurationTab.java:954)
  at com.android.ide.eclipse.adt.internal.launch.junit.AndroidJUnitLaunchConfigurationTab.initializeFrom(AndroidJUnitLaunchConfigurationTab.java:335)
  at org.eclipse.debug.ui.AbstractLaunchConfigurationTabGroup.initializeFrom(AbstractLaunchConfigurationTabGroup.java:86)
  at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupWrapper.initializeFrom(LaunchConfigurationTabGroupWrapper.java:194)
  at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.displayInstanceTabs(LaunchConfigurationTabGroupViewer.java:751)
  at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer$8.run(LaunchConfigurationTabGroupViewer.java:623)
  at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
  at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.inputChanged(LaunchConfigurationTabGroupViewer.java:640)
  at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.setInput0(LaunchConfigurationTabGroupViewer.java:602)
  at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.setInput(LaunchConfigurationTabGroupViewer.java:578)
  at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog.handleLaunchConfigurationSelectionChanged(LaunchConfigurationsDialog.java:941)
  at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog$3.selectionChanged(LaunchConfigurationsDialog.java:560)
  at org.eclipse.jface.viewers.StructuredViewer$3.run(StructuredViewer.java:888)
  at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
  at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
  at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
  at org.eclipse.jface.viewers.StructuredViewer.firePostSelectionChanged(StructuredViewer.java:886)
  at org.eclipse.jface.viewers.StructuredViewer.setSelection(StructuredViewer.java:1726)
  at org.eclipse.jface.viewers.TreeViewer.setSelection(TreeViewer.java:1139)
  at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationView.handleConfigurationAdded(LaunchConfigurationView.java:283)
  at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationView.access$1(LaunchConfigurationView.java:272)
  at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationView$2.run(LaunchConfigurationView.java:261)
  at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
  at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
  at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4140)
  at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757)
  at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
  at org.eclipse.jface.window.Window.open(Window.java:801)
  at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog.open(LaunchConfigurationsDialog.java:1132)
  at org.eclipse.debug.ui.DebugUITools$2.run(DebugUITools.java:579)
  at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
  at org.eclipse.debug.ui.DebugUITools.openLaunchConfigurationDialogOnGroup(DebugUITools.java:587)
  at org.eclipse.debug.ui.DebugUITools.openLaunchConfigurationDialogOnGroup(DebugUITools.java:521)
  at org.eclipse.debug.ui.actions.OpenLaunchDialogAction.run(OpenLaunchDialogAction.java:81)
  at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
  at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)
  at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)
  at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)
  at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
  at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
  at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165)
  at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)
  at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
  at org.eclipse.jface.window.Window.open(Window.java:801)
  at org.eclipse.ui.internal.views.log.EventDetailsDialog.open(EventDetailsDialog.java:180)
  at org.eclipse.ui.internal.views.log.EventDetailsDialogAction.run(EventDetailsDialogAction.java:98)
  at org.eclipse.ui.internal.views.log.LogView$15.doubleClick(LogView.java:535)
  at org.eclipse.jface.viewers.StructuredViewer$1.run(StructuredViewer.java:845)
  at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
  at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
  at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
  at org.eclipse.jface.viewers.StructuredViewer.fireDoubleClick(StructuredViewer.java:843)
  at org.eclipse.jface.viewers.AbstractTreeViewer.handleDoubleSelect(AbstractTreeViewer.java:1462)
  at org.eclipse.jface.viewers.StructuredViewer$4.widgetDefaultSelected(StructuredViewer.java:1246)
  at org.eclipse.jface.util.OpenStrategy.fireDefaultSelectionEvent(OpenStrategy.java:249)
  at org.eclipse.jface.util.OpenStrategy.access$0(OpenStrategy.java:246)
  at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:307)
  at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
  at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
  at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165)
  at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)
  at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696)
  at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660)
  at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)
  at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)
  at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
  at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)
  at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
  at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
  at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
  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:344)
  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:622)
  at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
  at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
  at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
  

我可以编辑此配置，但“应用”和“运行”按钮被禁用，配置未添加到运行按钮菜单。

如果尝试编辑调试配置，同样的问题。

系统:

• Eclipse版本:3.7.1(最新)
• Windows 7 x64

Answer 1

我想出了一个似乎适用于我的 Eclipse 安装的解决方法。

1. 启动Eclipse
2. 从“运行”菜单中列出“运行配置”。
3. 选择“Android JUnit 测试”类别，然后单击“新建”工具栏图标。
4. 将创建“New_configuration”，但将显示“NullPointerException”。之后无法编辑配置。
5. 退出 Eclipse
6. 打开文件资源管理器，然后导航到 [eclipse-workspace].metadata.plugins\org.eclipse.debug.core.launches
7. 这是存储运行配置的地方。使用文本编辑器编辑文件“New_configuration.launch”。
8. PROJEC_ATTR 节点不能为空条目。对于 value 属性，键入 Eclipse 中存在的项目的名称。
9. 保存文件。
10. 将文件重命名为所需的运行配置名称。
11. 启动Eclipse

您现在应该能够编辑 Android 的 JUnit 测试配置，而不会收到任何 NullPointer 异常。执行此操作后我注意到，配置文件中添加了一些以前丢失的 XML 节点。因此，该错误似乎仅出现在文件创建期间，而不是文件更新期间。

我希望这对其他人有帮助。

这是一个有效的启动文件示例(假设项目名称是 GemsTest。

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
    <launchConfiguration type="com.android.ide.eclipse.adt.junit.launchConfigurationType">
    <stringAttribute key="com.android.ide.eclipse.adt.commandline" value=""/>
    <intAttribute key="com.android.ide.eclipse.adt.delay" value="0"/>
    <booleanAttribute key="com.android.ide.eclipse.adt.nobootanim" value="false"/>
    <intAttribute key="com.android.ide.eclipse.adt.speed" value="0"/>
    <stringAttribute key="com.android.ide.eclipse.adt.target" value="AUTO"/>
    <booleanAttribute key="com.android.ide.eclipse.adt.wipedata" value="false"/>
    <stringAttribute key="org.eclipse.jdt.junit.CONTAINER" value=""/>
    <stringAttribute key="org.eclipse.jdt.launching.MAIN_TYPE" value=""/>
    <stringAttribute key="org.eclipse.jdt.launching.PROJECT_ATTR" value="GemsTest"/>
</launchConfiguration>