When I override some Key Listener code with:

    @Override
    public void keyPressed(KeyEvent e) {
        Object source = e;
        System.out.print(e);
        throw new UnsupportedOperationException("Not supported yet.");
    }

I get a crazy list of exceptions that I have no idea how to fix or where it came from. I get the output that I'm looking for, though, so I could ignore it, but I'd rather know what's going on. Any help?

Some exceptions for pressing the h key, then the v key:

java.awt.event.KeyEvent[KEY_PRESSED,keyCode=72,keyText=H,keyChar='h',keyLocation=KEY_LOCATION_STANDARD,rawCode=72,primaryLevelUnicode=104,scancode=35,extendedKeyCode=0x48] on frame0Exception in thread "AWT-EventQueue-0" java.lang.UnsupportedOperationException: Not supported yet.
 at pong.Pong.keyPressed(Pong.java:47)
 at java.awt.Component.processKeyEvent(Component.java:6463)
 at java.awt.Component.processEvent(Component.java:6282)
 at java.awt.Container.processEvent(Container.java:2229)
 at java.awt.Window.processEvent(Window.java:2022)
 at java.awt.Component.dispatchEventImpl(Component.java:4861)
 at java.awt.Container.dispatchEventImpl(Container.java:2287)
 at java.awt.Window.dispatchEventImpl(Window.java:2719)
 at java.awt.Component.dispatchEvent(Component.java:4687)
 at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1895)
 at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:762)
 at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1027)
 at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:899)
 at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:727)
 at java.awt.Component.dispatchEventImpl(Component.java:4731)
 at java.awt.Container.dispatchEventImpl(Container.java:2287)
 at java.awt.Window.dispatchEventImpl(Window.java:2719)
 at java.awt.Component.dispatchEvent(Component.java:4687)
 at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
 at java.awt.EventQueue.access$200(EventQueue.java:103)
 at java.awt.EventQueue$3.run(EventQueue.java:694)
 at java.awt.EventQueue$3.run(EventQueue.java:692)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
 at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
 at java.awt.EventQueue$4.run(EventQueue.java:708)
 at java.awt.EventQueue$4.run(EventQueue.java:706)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
Exception in thread "AWT-EventQueue-0" java.lang.UnsupportedOperationException: Not supported yet.
 at pong.Pong.keyTyped(Pong.java:41)
 at java.awt.Component.processKeyEvent(Component.java:6460)
 at java.awt.Component.processEvent(Component.java:6282)
 at java.awt.Container.processEvent(Container.java:2229)
 at java.awt.Window.processEvent(Window.java:2022)
 at java.awt.Component.dispatchEventImpl(Component.java:4861)
 at java.awt.Container.dispatchEventImpl(Container.java:2287)
 at java.awt.Window.dispatchEventImpl(Window.java:2719)
 at java.awt.Component.dispatchEvent(Component.java:4687)
 at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1895)
 at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:762)
 at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1027)
 at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:899)
 at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:727)
 at java.awt.Component.dispatchEventImpl(Component.java:4731)
 at java.awt.Container.dispatchEventImpl(Container.java:2287)
 at java.awt.Window.dispatchEventImpl(Window.java:2719)
 at java.awt.Component.dispatchEvent(Component.java:4687)
 at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
 at java.awt.EventQueue.access$200(EventQueue.java:103)
 at java.awt.EventQueue$3.run(EventQueue.java:694)
 at java.awt.EventQueue$3.run(EventQueue.java:692)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
 at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
 at java.awt.EventQueue$4.run(EventQueue.java:708)
 at java.awt.EventQueue$4.run(EventQueue.java:706)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
Exception in thread "AWT-EventQueue-0" java.lang.UnsupportedOperationException: Not supported yet.
 at pong.Pong.keyReleased(Pong.java:52)
 at java.awt.Component.processKeyEvent(Component.java:6466)
 at java.awt.Component.processEvent(Component.java:6282)
 at java.awt.Container.processEvent(Container.java:2229)
 at java.awt.Window.processEvent(Window.java:2022)
 at java.awt.Component.dispatchEventImpl(Component.java:4861)
 at java.awt.Container.dispatchEventImpl(Container.java:2287)
 at java.awt.Window.dispatchEventImpl(Window.java:2719)
 at java.awt.Component.dispatchEvent(Component.java:4687)
 at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1895)
 at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:762)
 at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1027)
 at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:899)
 at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:727)
 at java.awt.Component.dispatchEventImpl(Component.java:4731)
 at java.awt.Container.dispatchEventImpl(Container.java:2287)
 at java.awt.Window.dispatchEventImpl(Window.java:2719)
 at java.awt.Component.dispatchEvent(Component.java:4687)
 at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
 at java.awt.EventQueue.access$200(EventQueue.java:103)
 at java.awt.EventQueue$3.run(EventQueue.java:694)
 at java.awt.EventQueue$3.run(EventQueue.java:692)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
 at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
 at java.awt.EventQueue$4.run(EventQueue.java:708)
 at java.awt.EventQueue$4.run(EventQueue.java:706)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
java.awt.event.KeyEvent[KEY_PRESSED,keyCode=86,keyText=V,keyChar='v',keyLocation=KEY_LOCATION_STANDARD,rawCode=86,primaryLevelUnicode=118,scancode=47,extendedKeyCode=0x56] on frame0BUILD SUCCESSFUL (total time: 1 minute 2 seconds)

Ummm... It's your exception, you are the one throwing it.

Remove the throw statement and it will go away.

Oh... NetBeans put it in there for me when I made the override, and I assumed it showed what it could throw, not TO throw it... Thanks!

The declaration of what exceptions a method can throw are part of the method's signature, not part of the method's body. It's also written a bit differently: "throws Exception" vs "throw new Exception()" - the first describes the method, the second creates a new exception object and throws it.