Swing application eats CPU on resume after standby

My application contains a mix of regular Swing components and about 200 (small) custom components (JPanels) that draw themselves. The problem is that if put my laptop into Standby, then restart it, the application eats CPU. It goes from ~4% pre standby to ~48% after standby. Totally repeatable. There is only the main thread, the AWT thread and a couple timers firing: one to get data from a server and one to redraw the custom controls to make the control blink (calls repaint() to cue up a call to paintComponent()). I put timing code in the two timer driven threads and both are running fine. NOTE: each of the custom components is just a rectangle with a short text string in it. Think checkerboard with text. The background color is all that is being changed. It's basically a grid of alarm/status "lights".
I did some searching and only found a reference to a drawing bug that was fixed back in 1.4.x that had to do with WinXP and dual-headed computers.
Note that another simple Swing application I wrote (no custom controls), doesn't appear to behave this way, so I suspect it has to do with the custom drawing stuff (rolling my own paintComponent() method).
Any thoughts on how to figure out what is eating the CPU? I'm using NetBeans 6.7 and JDK 1.6_14 under Windows XP.
Edited by: garrysimmons on Sep 15, 2009 1:52 PM
Edited by: garrysimmons on Sep 15, 2009 2:57 PM
Edited by: garrysimmons on Sep 15, 2009 3:02 PM

It doesn't matter if it's a Swing timer or a Util timer. It behaves the same either way. That was one of the first things I tried.
I ended up refactoring the code to go from a grid of individual controls (think checker board where each square is a control that draws itself), to a single "board" control that draws a grid. That seems to have fixed the issue. I can go in/out of Standby and the app doesn't eat a ton of CPU any more. The real problem may still be there, just too small of an effect to notice.
I don't know why the original design would work fine before a Standby, but not after. Having ~200 little controls doing repaints twice a second must confuse something in the JVM/Windows versus having 4 large controls doing the same amount of drawing.
It's working, so time to move on.

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It is not the fault of NetBeans' GUI builder, JPanels are opaque by default, I mean whether you use Netbeans or not.Thank you!
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X230
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Go to Solution.

Fixed.
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Swing application eats CPU on resume after standby

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