I have turned on default LAF decorations for JFrame and JDialog. I am showing a frame with a couple of buttons. On clicking the buttons, I am opening up a JDialog and an input dialog from JOptionPane. The dialog opened by JOptionPane is using a different theme and not the default theme used by JDialog or JFrame. This looks very odd.

This is reproducible atleast since 1.4.2 on all platforms.

I have attached a sample test. Execute the sample test and you will get the frame mentioned above. Click on the buttons and compare the JOptionPane with JDialog. JOptionPane will appear in green color.