错误信息：
!ENTRY org.eclipse.ui 4 0 2020-07-02 12:32:22.545 !MESSAGE Unhandled event loop exception !STACK 0 org.eclipse.swt.SWTError: No more handles at org.eclipse.swt.SWT.error(SWT.java:4387) at org.eclipse.swt.SWT.error(SWT.java:4276) at org.eclipse.swt.SWT.error(SWT.java:4247) at org.eclipse.swt.widgets.Widget.error(Widget.java:468) at org.eclipse.swt.widgets.Control.createHandle(Control.java:704) at org.eclipse.swt.widgets.Composite.createHandle(Composite.java:305) at org.eclipse.swt.widgets.Decorations.createHandle(Decorations.java:420) at org.eclipse.swt.widgets.Shell.createHandle(Shell.java:584) at org.eclipse.swt.widgets.Control.createWidget(Control.java:744) at org.eclipse.swt.widgets.Scrollable.createWidget(Scrollable.java:134) at org.eclipse.swt.widgets.Decorations.createWidget(Decorations.java:428) at org.eclipse.swt.widgets.Shell.<init>(Shell.java:297) at org.eclipse.swt.widgets.Shell.<init>(Shell.java:375) at org.eclipse.jface.window.Window.createShell(Window.java:487) at org.eclipse.jface.window.Window.create(Window.java:430) at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089) at org.eclipse.jface.window.Window.open(Window.java:790) at org.eclipse.jface.dialogs.MessageDialog.open(MessageDialog.java:334) at org.eclipse.jface.dialogs.MessageDialogWithToggle.open(MessageDialogWithToggle.java:114) at org.eclipse.jface.dialogs.MessageDialogWithToggle.openOkCancelConfirm(MessageDialogWithToggle.java:209) at org.eclipse.ui.internal.ide.application.IDEWorkbenchWindowAdvisor.promptOnExit(IDEWorkbenchWindowAdvisor.java:218) at org.eclipse.ui.internal.ide.application.IDEWorkbenchWindowAdvisor.preWindowShellClose(IDEWorkbenchWindowAdvisor.java:171)
解决方案：工作空间/ .metadata / .plugins 搜索并且删除workbench.xmi文件即可
