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I don't have a lot of information, but when starting a fresh install of Netbeans 6.01 with JDK 6.05 I get the following error: java.lang.NullPointerException at org.netbeans.modules.autoupdate.ui.actions.AutoupdateCheckScheduler.checkUpdateElements (AutoupdateCheckScheduler.java:189) at org.netbeans.modules.autoupdate.ui.actions.AutoupdateCheckScheduler.access$300 (AutoupdateCheckScheduler.java:77) at org.netbeans.modules.autoupdate.ui.actions.AutoupdateCheckScheduler$4.run(AutoupdateCheckScheduler.java:148) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561) [catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986) It might be good to know I disabled java's auto-update-scheduler (in Windows), but I'm not sure whether that relates to Netbeans (is it the Netbeans autoupdater that crashes or a check for Java's updater that crashes?). I was unable to find any options relating to the Java updater. Did not find a related issue either. I can't seem to find any setting relating to the auto-updater of Netbeans, but I guess that's a feature request. Good luck with it, sorry I can't give any more information. A nullpointer exception is bad either way :p
The stacktrace looks like similar to the one in the Issue 121289 so closing as the duplicate. According to the issue, it is fixed in Patch 2 for 6.0.1 and certainly in 6.1/6.5. *** This issue has been marked as a duplicate of 121289 ***