These debugging tools reveal the sorts of difficulties I have had using Javax/Swing:

• performance
• component trees, especially their screen sizes
• HTML document trees
• event processing

src	Jdoc	class	note
		DebugTools.java	Provides tools for logging mouse events, printing the call stack, and showing the size data for AWT components.
		ElapsedTime.java	Create and print strings for time elapsed from a given starting point.
		Image2Hex.java	Convert some or all of an image to hex for inspection.
		ObjectName.java	Produce a printable String describing an object. Ranges from just a name for simple objects to a tree for a complex object.