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This bug was originally marked as duplicate of bug 203197, 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 201608290002) VM: Java HotSpot(TM) 64-Bit Server VM, 25.65-b01, Java(TM) SE Runtime Environment, 1.8.0_65-b17 OS: Windows 10 User Comments: GUEST: The problem occured after background scanning. Stacktrace: java.lang.StackOverflowError at java.util.WeakHashMap.getTable(WeakHashMap.java:350) at java.util.WeakHashMap.get(WeakHashMap.java:397) at org.openide.util.lookup.MetaInfServicesLookup.beforeLookup(MetaInfServicesLookup.java:146) at org.openide.util.lookup.AbstractLookup.lookupItem(AbstractLookup.java:427) at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:421) at org.openide.util.lookup.ProxyLookup.lookup(ProxyLookup.java:222)
Created attachment 161829 [details] stacktrace
Created attachment 165047 [details] stacktrace While opening (indexing) a project.