java - Thread updating GUI on dispatcher thread causes exception -

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I have 2 threads, one thread that runs "server" for my app, and the other is the event dispatcher Displayed for GUI: 

  public static zero main (string [] args) {// connection runtime R2 = new Runnabel () {@ Override Public Wide Run () {App. ConnectToServer (); }}; // Launch the main window SwingUtilities.invokeLater (New Runnabal) (Public Zero Run) {// Install Theme WebLink Endfile (); // launches main window; bootwind myMainWindow = new BootWindow ();}}); Thread thread = new thread (R2); Thr2.start (); } // static static app for example getInstance () {if (example == zero) {// window example example = create new app; } Return Example; } // server connection private static zero connect toServer () {System.out.println ("Connecting to e-Trade Manager server .."); ATM server server = new ATM server (); Server.connectEtmServer (); }   
 There is a way in the app thread in the app that listens new messages from a new server, then this method calls the update status in a class that is in the GUI thread The background color of a panel tries to update:  
  The method that is listening:   
  @Override Public Zero Process SystemStatus (SystemStatusUpdateWrapper systemUpdate) {System.out.println ("---- System Update ----"); System.out.println ("Connection ID:" + systemUpdate.getConnectionId ()); System.out.println ("System Status:" + systemUpdate.getSystemStatus ()); System.out.println ("Risk State:" + systemUpdate.getRiskState ()); Println ("--------- end ---------"); Summary smryWindow = new summary (); SmryWindow.updateStatus ("Q Time", systemUpdate.getSystemStatus ()); } {/ Code>  
  Update method in GUI thread   
  public zero update state (string panel name, string status) {if (panelName = "Qt") {if (position == "enabled") {qtimeStatusPanel.setBackground (Color.GREEN); Try {qtimeStatusPanel.validate (); QtimeStatusPanel.repaint (); } Hold (exception before) {System.err.println (ex.getMessage ()); }} And {qtimeStatusPanel.setBackground (Color.RED); }}}   
 When an updatestat is called it, it throws an exception:  
  java.util.ConcurrentModificationException at java.util.WeakHashMap $ HashIterator .nextEntry (WeakHashMap.java:762) java.util.WeakHashMap $ EntryIterator.next (WeakHashMap.java:801) java.util.WeakHashMap $ EntryIterator.next (WeakHashMap.java:799) com.alee.managers.style .applySkin (StyleManager.java:300) on StylManager   
 I'm not sure how to handle it, any advice?   
 
 Exclude  from the Iterator's own  ()  method, the Iterator will throw a  concurrent correction concept . " A ??  Verify that you are using an iterator, as shown.  
 Your program can also be properly synchronized. You can update the GUI when used, as shown.

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