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I added httpserver directory to favorites, and expanded the package nodes. When I expanded the last one (org.netbeans.....httpserver), the attached exception was thrown.
Created attachment 17826 [details] stacktrace
There are several fixes done by Martin, which IMO fix also problem. I tried it in current dev build and it is not reproducible anymore. Considering issue as fixed, if you see it again, please, reopen.
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Reorganization of java component