This is a 1.1.7 regression...

In the zip attach below, there is a very short class that demonstrates a
bug that was introduced on Solaris between 1.1.6 and 1.1.7. Running the
test class and displaying the program remotely on a PC under Hummingbird
Exceed 6.0.0.1 on WinNT 4.0 SP3, the following exception occurs
java.lang.NullPointerException
        at sun.awt.motif.MFramePeer.setIconImage(MFramePeer.java:113)
        at sun.awt.motif.MFramePeer.<init>(MFramePeer.java:87)
        at sun.awt.motif.MToolkit.createFrame(MToolkit.java:117)
        at java.awt.Frame.addNotify(Frame.java:203)
        at java.awt.Window.pack(Window.java:123)
        at SetIconFrameTest.main(SetIconFrameTest.java:14)

This same test works just fine with 1.1.6.