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Libraries panel in web project customizer: try to add library which is already on classpath second time. You get attached NPE.
Created attachment 56397 [details] npe
moving opened issues from TM <= 6.1 to TM=Dev
Fixed. http://hg.netbeans.org/main/rev/ee743449a934
*** Issue 138693 has been marked as a duplicate of this issue. ***