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Running Azureus, it seems that a large number of fonts are created and never disposed.
I tracked the problem down to the two methods getFontHeightFromPX(...) in org.gudy.azureus2.ui.swt.Utils.
As far as I could tell, these methods create multiple Font instances in order to find an appropriate font size. The Fonts are created in a loop, and all iterations but the last one properly dispose the Font created. These methods are called pretty frequently, and each call leaks a single Font object.

The bug in these methods is probably "inspired" by copying the code from a method that returns the font itself and not only its size (e.g., getFontWithHeight in the same class).

The fix is easy, adding "if (font != null) font.dispose();" to the finally block after the gc has been disposed.