[Geek] Debugging focus problems

Struggling with debugging hairy focus and other UI problems in Swing (Java)? Here's a handy little tip that I just found out about:

When running a Java application, type Ctrl-Shift-F1 and the VM will dump the components hierarchy into standard output.

p.s. Editorial comment: I question whether I should enter these super- geeky-limited-interest notes here. In the end, as I am using this blog as my personal lab notebook I decided that it's ok even though it might put some people off. My new standard is that I will precede the title with [geek] to give early warning and allow people to skip it.