This bug was originally marked as duplicate of bug 191249, 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 nbms-and-javadoc-6298-on-101209)
VM: Java HotSpot(TM) Client VM, 17.1-b03, Java(TM) SE Runtime Environment, 1.6.0_22-b04
OS: Linux

User Comments:
gholmer: Expanded a package node in the "Source Packages" node of a project.

yardus: opening a package in projects view

riversy: I'm going to my folder in tab 'Projects' and catched this error

quanghung.b: Warning : as NB suggested automatically to report the problem, I am doing it but I not sure that I could reproduce exactly the problem

1. Create a Java EE 6 Web application
2. Doing some tests by following the TS JUnit 68  : add test library, remove the test class, create test class, etc.. without opening the java file (NewServlet.java)
3. Click on the java file --> popup error suggesting to report the problem

GUEST: In the Projects view I opened up a package, containing multiple Java class files.
A simple action.




Stacktrace: 
java.lang.AssertionError: Entries: 5; vis. entries: 5; Infos: 5; entriesSize: 0; entryToInfoSize: 0
   at org.openide.nodes.EntrySupport$Lazy.setEntries(EntrySupport.java:1359)
   at org.openide.nodes.FilterNode$Children$LazySupport.updateEntries(FilterNode.java:1828)
   at org.openide.nodes.FilterNode$Children$LazySupport.update(FilterNode.java:1803)
   at org.openide.nodes.FilterNode$Children.addNotifyImpl(FilterNode.java:1477)
   at org.openide.nodes.FilterNode$Children.addNotify(FilterNode.java:1470)
   at org.openide.nodes.Children.callAddNotify(Children.java:568)