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This bug was originally marked as duplicate of bug 201617, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE Dev (Build 201112110600) VM: Java HotSpot(TM) 64-Bit Server VM, 21.0-b17, Java(TM) SE Runtime Environment, 1.7.0-b147 OS: Windows 7 User Comments: brettryan: Trying to remove project group. jkovalsky: I had ReproduceNB Maven projects [1] opened and compiled. On the parent project called "Close Dependent Projects" and then "Close Project" on the remaining parent project generated this exception. [1] http://netbeans.org/bugzilla/attachment.cgi?id=111943 mhmdchebbi: happen when closing a maven project GUEST: Closing a project jportway: closing enterprise app maven project carcassi: Changed active group GUEST: Creating a project group from my currently opened projects. All projects are Maven projects. sunbiz: Closing multiple projects throws this exception RageSteel: I selected 7 project than right click on then and select
Created attachment 114035 [details] stacktrace
Most reports are probably duplicates of bug #201617. Report #550435 is something else, I think due to unbalanced project open/close hooks from ergonomics. Cf. bug #203220 comment #9.
maybe a duplicate of issue 209815 ?
I do not think this is a duplicate; bug #209815 was a problem in project lookup whereas this seems related to ergonomics.
no more reports in post 7.2 builds, closing