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Build: NetBeans IDE 6.1 Beta (Build 200803050202) VM: Java HotSpot(TM) Client VM, 10.0-b19 OS: Windows 2000, 5.0, x86 User Comments: expanding "Configuration Files" node in a Web Project with struts-config.xml
Created attachment 57967 [details] stacktrace
Looks like a race-condition here that the WebModule is still not available when you did the UI action. Hence got the NPE.
That is indeed possible - I have been bumping into quite a few (somewhat minor) issues already with race conditions since I'm using a network drive for my .netbeans and TEMP directories...
Build: NetBeans IDE 6.1 Beta (Build 200803050202) VM: Java HotSpot(TM) Client VM, 10.0-b19 OS: Windows 2000, 5.0, x86 User Comments: opening tiles-definitions.xml after opening struts-config.xml
Created attachment 58144 [details] stacktrace
Fix in the 6.1 trunk. changeset 20bed4a62a6a in main details: http://hg.netbeans.org/main?cmd=changeset;node=20bed4a62a6a