Netbeans RCP: Asking before exiting the application

This article explains how to present a confirmation dialog asking if the user really wants to close the application.

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The following solution registers a callable via @OnStop annotation. The callable is an opportunity to cancel closing the application by returning false.

import java.util.concurrent.Callable;
import org.openide.DialogDisplayer;
import org.openide.NotifyDescriptor;
import org.openide.modules.OnStop;

public class ApplicationOnStop implements Callable<Boolean> {
   public Boolean call() throws Exception {
      NotifyDescriptor d = new NotifyDescriptor.Confirmation("Close application?", NotifyDescriptor.YES_NO_OPTION)
      return DialogDisplayer.getDefault().notify(d) == NotifyDescriptor.YES_OPTION;