Exception in thread "AWT-EventQueue-0"
java.lang.IllegalMonitorStateException
  at java.lang.Object.wait(Native Method)
  at java.lang.Object.wait(Object.java:484)
  at
javax.swing.BufferStrategyPaintManager$BufferInfo.windowClosed(BufferStrategyPaintManager.java:873)
  at java.awt.Window.processWindowEvent(Window.java:1596)
  at javax.swing.JDialog.processWindowEvent(JDialog.java:584)
  at java.awt.Window.processEvent(Window.java:1551)
  at java.awt.Component.dispatchEventImpl(Component.java:4365)
  at java.awt.Container.dispatchEventImpl(Container.java:2018)
  at java.awt.Window.dispatchEventImpl(Window.java:2205)
  at java.awt.Component.dispatchEvent(Component.java:4195)
  at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
  at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
  at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
  at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
  at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
  at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
  at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)