Attached is a test case that shows the problem.
Run the test and click the button to bring up 4 dialogs:
  1. AWT resizable
  2. AWT non-resizable
  3. Swing resizable
  4. Swing non-resizable

Under 1.4.0 and 1.4.1, the non-resizable dialogs have no icons in the upper left. In 1.4.2-beta-b07, they have icons. I believe this to be unintentional and that we wish for non-resizable dialogs to not have icons.

Running on Windows NT 4.0 SP6