adding and removing trayicon in java? -

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i want add icon system tray when window minimized , remove when maximized exception , can't solve it.

exception in thread "awt-eventqueue-0" java.lang.illegalargumentexception: adding trayicon added.

 else if (e.getsource() == minimizebutton)         setstate(islamicproject.iconified);     {       // test see if supports tray         if (systemtray.issupported())         {             //create tray             tray = systemtray.getsystemtray();              image image = toolkit.getdefaulttoolkit().getimage("d:/art gallary 2008/islamic/forsan_03.gif");             //create menu items             popupmenu popup = new popupmenu();             menuitem exitmenu = new menuitem("exit");             menuitem openmenu = new menuitem("open");            trayicon = new trayicon(image, "the tip text", popup);              //add listeners of menu items             listenforexitmenu exmu = new listenforexitmenu();             listenforopenmenu opmu = new listenforopenmenu();             exitmenu.addactionlistener(exmu);             openmenu.addactionlistener(opmu);             //adds listener when icon in tray  clicked opens             //trayicon.addactionlistener(opmu);             mouselis l = new mouselis();             trayicon.addmouselistener(l);               // window state listener tests see state of frame             addwindowstatelistener(new windowstatelistener() {                 public void windowstatechanged(windowevent e) {                     if (e.getnewstate() == iconified)                     {                         try                         {                             tray.add(trayicon);                             setvisible(false);                         } catch (awtexception ex)                         {                             system.err.println("can't add tray");                         }                     }                     if (e.getnewstate() == normal)                     {                         tray.remove(trayicon);                         setvisible(true);                     }                 }              });             // adding open , exit menu             popup.add(openmenu);             popup.add(exitmenu);         }         else         {             system.err.println("tray unavailable");         }     }

here example:

import java.awt.*; import java.awt.event.*; import javax.swing.jframe; import javax.swing.uimanager;  /**  *  * @author mohammad faisal  * ermohammadfaisal.blogspot.com  * facebook.com/m.faisal6621  *  */  public class hidetosystemtray extends jframe{     trayicon trayicon;     systemtray tray;     hidetosystemtray(){         super("systemtray test");         system.out.println("creating instance");         try{             system.out.println("setting , feel");             uimanager.setlookandfeel(uimanager.getsystemlookandfeelclassname());         }catch(exception e){             system.out.println("unable set lookandfeel");         }         if(systemtray.issupported()){             system.out.println("system tray supported");             tray=systemtray.getsystemtray();              image image=toolkit.getdefaulttoolkit().getimage("/media/faisal/dukeimg/duke256.png");             actionlistener exitlistener=new actionlistener() {                 public void actionperformed(actionevent e) {                     system.out.println("exiting....");                     system.exit(0);                 }             };             popupmenu popup=new popupmenu();             menuitem defaultitem=new menuitem("exit");             defaultitem.addactionlistener(exitlistener);             popup.add(defaultitem);             defaultitem=new menuitem("open");             defaultitem.addactionlistener(new actionlistener() {                 public void actionperformed(actionevent e) {                     setvisible(true);                     setextendedstate(jframe.normal);                 }             });             popup.add(defaultitem);             trayicon=new trayicon(image, "systemtray demo", popup);             trayicon.setimageautosize(true);         }else{             system.out.println("system tray not supported");         }         addwindowstatelistener(new windowstatelistener() {             public void windowstatechanged(windowevent e) {                 if(e.getnewstate()==iconified){                     try {                         tray.add(trayicon);                         setvisible(false);                         system.out.println("added systemtray");                     } catch (awtexception ex) {                         system.out.println("unable add tray");                     }                 }         if(e.getnewstate()==7){                     try{             tray.add(trayicon);             setvisible(false);             system.out.println("added systemtray");             }catch(awtexception ex){             system.out.println("unable add system tray");         }             }         if(e.getnewstate()==maximized_both){                     tray.remove(trayicon);                     setvisible(true);                     system.out.println("tray icon removed");                 }                 if(e.getnewstate()==normal){                     tray.remove(trayicon);                     setvisible(true);                     system.out.println("tray icon removed");                 }             }         });         seticonimage(toolkit.getdefaulttoolkit().getimage("duke256.png"));          setvisible(true);         setsize(300, 200);         setdefaultcloseoperation(jframe.exit_on_close);     }     public static void main(string[] args){         new hidetosystemtray();     } }

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