java - Jframe will not close on "X" -

this code work in every way not close fully, seems hang hit "x" on window. after hit close, if minimize screen , maximize black. way can close exit eclipse, ide.

prior had different , feel. stole code gui, made in netbeans make better hand. figure has "nimbus" , feel, maybe not closing other objects problem?

static clutilcompact app = null; // static auxppanel aux = null; // jpanel static statuspanel stat = null; // jpanel static useractpanel user = null; // jpanel static inputpanel input = null; // jpanel static automator auto = null;            //public class automator extends thread         //   implements nativemouseinputlistener, nativekeylistener    public clutilcompact()  {     aux = new auxppanel();     stat = new statuspanel();     user = new useractpanel();     auto = new automator();     input = new inputpanel();     globalscreen.getinstance().addnativekeylistener(auto);     globalscreen.getinstance().addnativemouselistener(auto);     globalscreen.getinstance().addnativemousemotionlistener(auto);     auto.start(); }  public static void main(string[] args)  {     // create app, , panels     app = new clutilcompact();     // let panels have access app     aux.setapp(app);     stat.setapp(app);     user.setapp(app);     auto.setapp(app);     app.updateoutput("started");     app.updatestatus("started");     input.setapp(app);      try {         (javax.swing.uimanager.lookandfeelinfo info : javax.swing.uimanager.getinstalledlookandfeels()) {             if ("nimbus".equals(info.getname())) {                 javax.swing.uimanager.setlookandfeel(info.getclassname());                 break;             }         }     } catch (classnotfoundexception ex) {         java.util.logging.logger.getlogger(clutilcompact.class.getname()).log(java.util.logging.level.severe, null, ex);     } catch (instantiationexception ex) {         java.util.logging.logger.getlogger(clutilcompact.class.getname()).log(java.util.logging.level.severe, null, ex);     } catch (illegalaccessexception ex) {         java.util.logging.logger.getlogger(clutilcompact.class.getname()).log(java.util.logging.level.severe, null, ex);     } catch (javax.swing.unsupportedlookandfeelexception ex) {         java.util.logging.logger.getlogger(clutilcompact.class.getname()).log(java.util.logging.level.severe, null, ex);     }     //</editor-fold>      /* create , display form */     java.awt.eventqueue.invokelater(new runnable() {         public void run() {             app.setdefaultcloseoperation(exit_on_close);             app.setalwaysontop(true);             app.setvisible(true);         }     }); } 

class automator run , close

public void run() {     try // make global hook     {         globalscreen.registernativehook();     }     catch (nativehookexception ex){theapp.updateoutput("no global keyboard or mouse hook");return;}     try // create robot (can simulate user input such mouse , keyboard input)     {         rob = new robot();     }      catch (awtexception e1) {theapp.updateoutput("the robot not created");return;}      while(true) {} }  public void onclose() {     globalscreen.unregisternativehook(); } 

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edit: little red box in eclipse closes it, still on own not.

set default close action "dispose_on_close" instead of exit_on_close (general tip)

hovercraft full of eels comment quite useful. if have undisposed windows or non-daemon threads, application not terminate

check active frames.. use frame.getframes() if windows/frames disposed of, debug check non-daemon threads still running

one cruel effective solution system.exit(0)

class should implement windowlistener

// use method public void windowclosed(windowevent e){     system.exit(0); }