Hi, I can't get netscape.javascript.* to work. The Java console says JSException and NullPointerException.

netscape.javascript.JSException
at netscape.javascript.JSObject.getWindow(JSObject.java:141)
at fun_project.<init>(fun_project.java:21)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorI
mpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorA
ccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:785)
at sun.plugin.AppletViewer.createApplet(AppletViewer.java:2302)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:714)
at sun.applet.AppletPanel.run(AppletPanel.java:368)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException
at java.applet.Applet.getParameter(Applet.java:174)
at netscape.javascript.JSObject.getWindow(JSObject.java:112)
... 12 more



This is the offending line.
JSObject window = (JSObject) JSObject.getWindow(this);


What am I doing wrong?
Where can I find the reference/guide for this library?

I mostly work with JavaScript and Scheme. Java documentation is driving me insane.. help!


#### EDIT #####
I'm an idiot. I had to put declaration in the top level and assignment inside a function. It works now. Thanks..