Created attachment 24105 [details]
log file

I'm not able to reproduce, lowering priority to standard. Please evaluate those
exceptions.

I tried again and again. When I do it outside "public void run()" method all is
right. But when I do it inside run(), on "new NewJFrame1().setVisible(true);" it
fires NPE. I hope is ok now. This happens everytime!

public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame1().setVisible(true);
            }
        });
    }

I hope you tested on the same build

the same has happend in the latest build 200508231800.

of course that that piece of code was generated by NetBeans within a new JForm. 

I got it. It's reproducible. 
I've put the code for setting L&F into contructor and regardless if the
constructor declares throws or not trying to surround following code:
new NewJFrame1().setVisible(true);
with try-catch ends up with NPE.

Fixed in trunk.
Checking in NewClassExpressionImpl.java;
/cvs/java/javacore/src/org/netbeans/modules/javacore/jmiimpl/javamodel/
NewClassExpressionImpl.java,v  <--  NewClassExpressionImpl.java
new revision: 1.10; previous revision: 1.9
done

Verified in the dev build 200512262030.

Reorganization of java component