The following code:

import java.awt.*;

public class Test {
    public static void main(String[] args) {
        Frame f = new Frame("TEST");
        f.pack();
        System.exit(0);
    }
}

Triggers loading of a bunch of Swing's motif look and feel classes
(-verbose output is attached).

I'm aware of the dependancy of XAWT on Swing, but I'm not using any of
the classes that should trigger loading of Swing.