从处理程序调用时，实现 INewWizard 的自定义文件创建向导会抛出 NPE
Custom File creation Wizard implementing INewWizard throws NPE when called from Handler
我正在扩展 NewFileCreation 向导，我可以从 Select 菜单选项中的向导调用它。但是，当我使用处理程序从工具栏调用相同内容时，我得到了一个 NPE。有没有一种方法可以从工具栏调用新建文件创建向导，因为向导容器似乎是从 select 向导容器字段中填充的，这些字段在从工具栏调用时不可用。
Shell activeShell = HandlerUtil.getActiveShell(event);
IWizard wizard = new CustomProjectNewScriptFile();
WizardDialog dialog = new WizardDialog(activeShell, wizard);
dialog.open();
return null;
CustomProjectNewFile:
public abstract class CustomProjectNewFile extends Wizard implements INewWizard ,IExecutableExtension {
protected WizardNewFileCreationPage _pageOne;
private IWorkbench _workbench;
protected IStructuredSelection _selection;
public CustomProjectNewFile() {
super();
}
public CustomProjectNewFile(String wizardName) {
setWindowTitle(wizardName);
}
@Override
public boolean performFinish() {
boolean result = false;
IFile file = _pageOne.createNewFile();
result = file != null;
if (result) {
try {
IDE.openEditor(_workbench.getActiveWorkbenchWindow().getActivePage(), file);
} catch (PartInitException e) {
e.printStackTrace();
}
} // else no file created...result == false
return result;
}
@Override
public void init(IWorkbench workbench, IStructuredSelection selection) {
_workbench = workbench;
_selection = selection;
}
}
CustomProjectNewScriptFile:
public class CustomProjectNewScriptFile extends CustomProjectNewFile {
private static final String WIZARD_NAME = "New Script File"; //$NON-NLS-1$
private IConfigurationElement _configurationElement;
/**
*
*/
public CustomProjectNewScriptFile() {
super(WIZARD_NAME);
}
@Override
public void addPages() {
super.addPages();
_pageOne = new WizardSchemaNewFileCreationPage(_selection);
addPage(_pageOne);
}
@Override
public void setInitializationData(IConfigurationElement config, String propertyName, Object data)
throws CoreException {
_configurationElement = config;
}
}
WizardSchemaNewFileCreationPage:
public class WizardSchemaNewFileCreationPage extends WizardNewFileCreationPage {
private static final String PAGE_NAME = "Custom Plug-in Schema File Wizard"; //$NON-NLS-1$
public WizardSchemaNewFileCreationPage(IStructuredSelection selection) {
super(PAGE_NAME, selection);
setTitle(NewWizardMessages.WizardSchemaNewFileCreationPage_Schema_File_Wizard);
setDescription(NewWizardMessages.WizardSchemaNewFileCreationPage_Create_a_Schema_File);
setFileExtension(NewWizardMessages.WizardSchemaNewFileCreationPage_Schema_File_Extension);
}
@Override
protected InputStream getInitialContents() {
String templateFilePath = NewWizardMessages.WizardSchemaNewFileCreationPage_Schema_Template_Location;
StatusManager.getManager().handle(new Status(Status.INFO, Activator.PLUGIN_ID, Status.OK, templateFilePath, null), StatusManager.LOG);
InputStream inputStream = null;
try {
inputStream = Activator.getDefault().getBundle().getEntry(templateFilePath).openStream();
} catch (IOException e) {
StatusManager.getManager().handle(new Status(Status.ERROR, Activator.PLUGIN_ID, Status.ERROR, "Failed", e), StatusManager.LOG);
}
return inputStream;
}
}
异常：
org.eclipse.e4.core.di.InjectionException: java.lang.NullPointerException
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:68)
at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:252)
at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:234)
at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132)
at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:152)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:493)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:486)
at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:210)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.executeItem(HandledContributionItem.java:799)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.handleWidgetSelection(HandledContributionItem.java:675)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.access(HandledContributionItem.java:659)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.handleEvent(HandledContributionItem.java:592)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4362)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1113)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4180)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3769)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1127)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1018)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156)
at org.eclipse.ui.internal.Workbench.run(Workbench.java:654)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:598)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:139)
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(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:669)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)
at org.eclipse.equinox.launcher.Main.run(Main.java:1515)
at org.eclipse.equinox.launcher.Main.main(Main.java:1488)
Caused by: java.lang.NullPointerException
at org.eclipse.ui.dialogs.WizardNewFileCreationPage.initialPopulateContainerNameField(WizardNewFileCreationPage.java:699)
at org.eclipse.ui.dialogs.WizardNewFileCreationPage.createControl(WizardNewFileCreationPage.java:253)
at org.eclipse.jface.wizard.Wizard.createPageControls(Wizard.java:175)
at org.eclipse.jface.wizard.WizardDialog.createPageControls(WizardDialog.java:705)
at org.eclipse.jface.wizard.WizardDialog.createContents(WizardDialog.java:597)
at org.eclipse.jface.window.Window.create(Window.java:430)
at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1096)
at org.eclipse.jface.window.Window.open(Window.java:792)
at suitacore.handlers.SuitANewScriptHandler.execute(SuitANewScriptHandler.java:23)
at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:295)
at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:90)
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.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)
WizardNewFileCreationPage 给出 NPE，因为没有当前选择。
您的 Wizard 代码期望从 INewWizard 接口中声明的 init 方法中获取选择，但您正在使用 WizardDialog 来显示向导 - 不调用此方法。
您可以在创建 WizardDialog 之前添加对 init 的调用：
INewWizard wizard = new CustomProjectNewScriptFile();
wizard.init(workbench, selection);
或者只使用 StructuredSelection.EMPTY
我正在扩展 NewFileCreation 向导，我可以从 Select 菜单选项中的向导调用它。但是，当我使用处理程序从工具栏调用相同内容时，我得到了一个 NPE。有没有一种方法可以从工具栏调用新建文件创建向导，因为向导容器似乎是从 select 向导容器字段中填充的，这些字段在从工具栏调用时不可用。
Shell activeShell = HandlerUtil.getActiveShell(event);
IWizard wizard = new CustomProjectNewScriptFile();
WizardDialog dialog = new WizardDialog(activeShell, wizard);
dialog.open();
return null;
CustomProjectNewFile:
public abstract class CustomProjectNewFile extends Wizard implements INewWizard ,IExecutableExtension {
protected WizardNewFileCreationPage _pageOne;
private IWorkbench _workbench;
protected IStructuredSelection _selection;
public CustomProjectNewFile() {
super();
}
public CustomProjectNewFile(String wizardName) {
setWindowTitle(wizardName);
}
@Override
public boolean performFinish() {
boolean result = false;
IFile file = _pageOne.createNewFile();
result = file != null;
if (result) {
try {
IDE.openEditor(_workbench.getActiveWorkbenchWindow().getActivePage(), file);
} catch (PartInitException e) {
e.printStackTrace();
}
} // else no file created...result == false
return result;
}
@Override
public void init(IWorkbench workbench, IStructuredSelection selection) {
_workbench = workbench;
_selection = selection;
}
}
CustomProjectNewScriptFile:
public class CustomProjectNewScriptFile extends CustomProjectNewFile {
private static final String WIZARD_NAME = "New Script File"; //$NON-NLS-1$
private IConfigurationElement _configurationElement;
/**
*
*/
public CustomProjectNewScriptFile() {
super(WIZARD_NAME);
}
@Override
public void addPages() {
super.addPages();
_pageOne = new WizardSchemaNewFileCreationPage(_selection);
addPage(_pageOne);
}
@Override
public void setInitializationData(IConfigurationElement config, String propertyName, Object data)
throws CoreException {
_configurationElement = config;
}
}
WizardSchemaNewFileCreationPage:
public class WizardSchemaNewFileCreationPage extends WizardNewFileCreationPage {
private static final String PAGE_NAME = "Custom Plug-in Schema File Wizard"; //$NON-NLS-1$
public WizardSchemaNewFileCreationPage(IStructuredSelection selection) {
super(PAGE_NAME, selection);
setTitle(NewWizardMessages.WizardSchemaNewFileCreationPage_Schema_File_Wizard);
setDescription(NewWizardMessages.WizardSchemaNewFileCreationPage_Create_a_Schema_File);
setFileExtension(NewWizardMessages.WizardSchemaNewFileCreationPage_Schema_File_Extension);
}
@Override
protected InputStream getInitialContents() {
String templateFilePath = NewWizardMessages.WizardSchemaNewFileCreationPage_Schema_Template_Location;
StatusManager.getManager().handle(new Status(Status.INFO, Activator.PLUGIN_ID, Status.OK, templateFilePath, null), StatusManager.LOG);
InputStream inputStream = null;
try {
inputStream = Activator.getDefault().getBundle().getEntry(templateFilePath).openStream();
} catch (IOException e) {
StatusManager.getManager().handle(new Status(Status.ERROR, Activator.PLUGIN_ID, Status.ERROR, "Failed", e), StatusManager.LOG);
}
return inputStream;
}
}
异常：
org.eclipse.e4.core.di.InjectionException: java.lang.NullPointerException
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:68)
at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:252)
at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:234)
at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132)
at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:152)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:493)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:486)
at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:210)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.executeItem(HandledContributionItem.java:799)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.handleWidgetSelection(HandledContributionItem.java:675)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.access(HandledContributionItem.java:659)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.handleEvent(HandledContributionItem.java:592)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4362)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1113)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4180)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3769)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1127)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1018)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156)
at org.eclipse.ui.internal.Workbench.run(Workbench.java:654)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:598)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:139)
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(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:669)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)
at org.eclipse.equinox.launcher.Main.run(Main.java:1515)
at org.eclipse.equinox.launcher.Main.main(Main.java:1488)
Caused by: java.lang.NullPointerException
at org.eclipse.ui.dialogs.WizardNewFileCreationPage.initialPopulateContainerNameField(WizardNewFileCreationPage.java:699)
at org.eclipse.ui.dialogs.WizardNewFileCreationPage.createControl(WizardNewFileCreationPage.java:253)
at org.eclipse.jface.wizard.Wizard.createPageControls(Wizard.java:175)
at org.eclipse.jface.wizard.WizardDialog.createPageControls(WizardDialog.java:705)
at org.eclipse.jface.wizard.WizardDialog.createContents(WizardDialog.java:597)
at org.eclipse.jface.window.Window.create(Window.java:430)
at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1096)
at org.eclipse.jface.window.Window.open(Window.java:792)
at suitacore.handlers.SuitANewScriptHandler.execute(SuitANewScriptHandler.java:23)
at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:295)
at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:90)
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.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)
WizardNewFileCreationPage 给出 NPE，因为没有当前选择。
您的 Wizard 代码期望从 INewWizard 接口中声明的 init 方法中获取选择，但您正在使用 WizardDialog 来显示向导 - 不调用此方法。
您可以在创建 WizardDialog 之前添加对 init 的调用：
INewWizard wizard = new CustomProjectNewScriptFile();
wizard.init(workbench, selection);
或者只使用 StructuredSelection.EMPTY