I know this is pretty vauge, but it happened as
soon as I started typing and I didn't see an issue
like this one already entered.

I'm using:
Product Version: Netbeans IDE Dev 4.0 Beta 2
(Build 200409220845)
Java: 1.5.0 

I finally got my 3.6 project into 4.0 and when I
compiled with -Xlint:unchecked I found all my
collections that needed to be typed. I clicked on
the first [unchecked] output line. Then I went to
the List declaration and typed < to start adding
the type information. That's when I got this
exception.


Annotation: Exception occurred in Request Processor
java.lang.NullPointerException
	at
org.netbeans.modules.java.codesync.ClassDependencyImpl.getMethodElement(ClassDependencyImpl.java:531)
	at
org.netbeans.modules.java.codesync.ClassDependencyImpl.synchronizeMethods(ClassDependencyImpl.java:940)
	at
org.netbeans.modules.java.codesync.ClassDependencyImpl.implementFromSuper(ClassDependencyImpl.java:1148)
	at
org.netbeans.modules.java.codesync.ClassDependencyImpl.access$000(ClassDependencyImpl.java:65)
	at
org.netbeans.modules.java.codesync.ClassDependencyImpl$Synchronizer.collectSupertypeMethods(ClassDependencyImpl.java:220)
	at
org.netbeans.modules.java.codesync.ClassDependencyImpl$Synchronizer.run(ClassDependencyImpl.java:210)
	at org.openide.util.Task.run(Task.java:136)
	at
org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:330)
[catch] at
org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:686)