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Build: NetBeans IDE Dev (Build 20160429-b46d91e0f3db) VM: Java HotSpot(TM) 64-Bit Server VM, 25.51-b03, Java(TM) SE Runtime Environment, 1.8.0_51-b16 OS: Mac OS X User Comments: akrasny: Started an IDE Stacktrace: java.lang.NullPointerException at org.netbeans.modules.apisupport.project.universe.AbstractEntry.compareTo(AbstractEntry.java:102) at org.netbeans.modules.apisupport.project.universe.AbstractEntry.compareTo(AbstractEntry.java:72) at java.util.TreeMap.put(TreeMap.java:568) at java.util.TreeSet.add(TreeSet.java:255) at java.util.AbstractCollection.addAll(AbstractCollection.java:344) at java.util.TreeSet.addAll(TreeSet.java:312)
Created attachment 159515 [details] stacktrace
I gave wrong (not full) description in the IDE form. Actually after starting the IDE (there were several projects pre-opened) I choose Properties of a project (NetBeans Platform Application) and opened 'Libraries' tab.