我使用Spring Tool Suite和Spring Roo对数据库进行逆向工程。现在我想从项目中删除AspectJ文件并获取标准的JavaEE类。 为此，我右键单击了我的项目 - ＆gt;重构 - ＆gt;推入...... 在此之后，我收到一个错误框，说明发生了多个问题（Java.lang.NullPointerException）。有时Spring Tool Suite会冻结，我必须使用任务管理器关闭它。在错误日志中，我一遍又一遍地发现了以下错误，因为它似乎每20毫秒发生一次。当我只选择几个类而不是整个项目时，也会发生这种情况。如果有人能帮我解决这个问题，我真的很感激。
以下是日志文件的例外：
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.jface".
!STACK 0
java.lang.NullPointerException
at org.eclipse.ajdt.internal.ui.refactoring.PushInRefactoringInputPage$3.update(PushInRefactoringInputPage.java:314)
at org.eclipse.jface.viewers.ViewerColumn.refresh(ViewerColumn.java:141)
at org.eclipse.jface.viewers.AbstractTableViewer.doUpdateItem(AbstractTableViewer.java:382)
at org.eclipse.jface.viewers.StructuredViewer$UpdateItemSafeRunnable.run(StructuredViewer.java:474)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:50)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:173)
at org.eclipse.jface.viewers.StructuredViewer.updateItem(StructuredViewer.java:2170)
at org.eclipse.jface.viewers.AbstractTableViewer.createItem(AbstractTableViewer.java:273)
at org.eclipse.jface.viewers.AbstractTableViewer.internalRefreshAll(AbstractTableViewer.java:715)
at org.eclipse.jface.viewers.AbstractTableViewer.internalRefresh(AbstractTableViewer.java:607)
at org.eclipse.jface.viewers.AbstractTableViewer.internalRefresh(AbstractTableViewer.java:599)
at org.eclipse.jface.viewers.AbstractTableViewer.lambda$0(AbstractTableViewer.java:561)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1458)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1419)
at org.eclipse.jface.viewers.AbstractTableViewer.inputChanged(AbstractTableViewer.java:561)
at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:286)
at org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:1696)
at org.eclipse.ajdt.internal.ui.refactoring.PushInRefactoringInputPage.createTable(PushInRefactoringInputPage.java:229)
at org.eclipse.ajdt.internal.ui.refactoring.PushInRefactoringInputPage.createControl(PushInRefactoringInputPage.java:172)
at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2.createContents(RefactoringWizardDialog2.java:625)
at org.eclipse.jface.window.Window.create(Window.java:426)
at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1095)
at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation$1.run(RefactoringWizardOpenOperation.java:179)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation.run(RefactoringWizardOpenOperation.java:203)
at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation.run(RefactoringWizardOpenOperation.java:122)
at org.eclipse.ajdt.internal.ui.refactoring.PushInRefactoringAction.run(PushInRefactoringAction.java:84)
at org.eclipse.ajdt.internal.ui.refactoring.PushInRefactoringAction.run(PushInRefactoringAction.java:60)
at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:247)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:565)
at org.eclipse.jface.action.ActionContributionItem.lambda$4(ActionContributionItem.java:397)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4410)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4228)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3816)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1121)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1022)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:150)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:687)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:604)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:138)
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:388)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
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:673)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:610)
at org.eclipse.equinox.launcher.Main.run(Main.java:1519)