How to replace AWQ EventQueue with your own implementation

Question

To debug strange behavior in a Swing application, I would like to replace AWT EventQueue with my own implementation.

Is it possible? How?

Just in case, you are interested in:

• the implementation will be a simple wrapper around a regular Eventqueue, performing some logging.

• The problem I would like to debug is TableCellEditor, which works fine in a small demo application, but when it is put into a real application, stopCellEditing is called immediately due to some kind of event. I would like to access the event to find out where it is coming from.

Answer 1

EventQueue has a push () method that will do exactly what you want. Here is a small demo:

public class QueueTest { public static void main(String[] args) throws InterruptedException, InvocationTargetException { EventQueue eventQueue = Toolkit.getDefaultToolkit().getSystemEventQueue(); eventQueue.push(new MyEventQueue()); EventQueue.invokeAndWait(new Runnable() { public void run() { System.out.println("Run"); } }); } private static class MyEventQueue extends EventQueue { public void postEvent(AWTEvent theEvent) { System.out.println("Event Posted"); super.postEvent(theEvent); } } } 

Answer 2

Be careful with java 1.7. There is a bug . The solution hosted by rancidfishbreath is excellent with java 1.6, but leads to a Swing application that never comes out with java 1.7. In JDK 1.7, you need to install a new EvenQueue in the Event Dispatch stream ... and outside of it in JDK 1.6 ... Write once, run everywhere; -)

Here is a universal solution ... I hope 1.8 will not change it; -)

 import java.awt.AWTEvent; import java.awt.EventQueue; import java.awt.Toolkit; import java.lang.reflect.InvocationTargetException; public class QueueTest { public static void main(String[] args) throws InterruptedException, InvocationTargetException { if (!isJava7Like()) setQueue(); EventQueue.invokeAndWait(new Runnable() { public void run() { if (QueueTest.isJava7Like()) setQueue(); System.out.println("Run"); } }); } private static void setQueue() { EventQueue eventQueue = Toolkit.getDefaultToolkit().getSystemEventQueue(); eventQueue.push(new MyEventQueue()); } private static boolean isJava7Like() { return Float.parseFloat(System.getProperty("java.specification.version")) > 1.6; } private static class MyEventQueue extends EventQueue { public void postEvent(AWTEvent theEvent) { System.out.println("Event Posted"); super.postEvent(theEvent); } } } 

Answer 3

This is normal. The EventQueue extension will give you access to all AWTEvents.

How do you get an appeal to all events. The list of events is as follows.

[AWTEvent, BeanContextEvent, CaretEvent, ChangeEvent, ConnectionEvent, DragGestureEvent, DragSourceEvent, DropTargetEvent, FlavorEvent, HandshakeCompletedEvent, HyperlinkEvent, LineEvent, ListDataEvent, ListSelectionEventE ,EndEChangePreview, MenuEvent, NamingEvent, NoamingChange , SSLSessionBindingEvent, StatementEvent, TableColumnModelEvent, TableModelEvent, TreeExpansionEvent, TreeModelEvent, TreeSelectionEvent, UndoableEditEvent, UnsolicitedNotificationEvent]