JFrame and color pallette

I attempted to make visible JFrame object on NT.
JVM complained that I have to set at least 256 colors from control panel–>display–>settings. And it crashed somewhere in native method. By reason that only God knows I couldn’t change color pallette from 16 to 256. I run w98 and NT on same PC and w98 accept 256 colors but NT doesn’t. So my question is : how to change JFrame settings to allow work with 16 colors. There should be some property setting in one of upper classes that JFrame extends.Help me please to resolve this puzzle.
-Anatoly.