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JDK 1.5.0 b51, May 18 refact build, all NB modules open.
Created attachment 14964 [details] Stack traces
Not so random; happened again, doing where used on o.o.f.Repository.addFileSystem. Seems to happen when there is no Where Used window open yet? Sometimes.
Created attachment 14966 [details] More exceptions
The NPE in AstProvider.<init> seems to happen again and again; cannot do a where used on addFileSystem now at all.
Works after a restart of the IDE, let's see how long that lasts.
I cannot reproduce it.
I know, it doesn't seem to happen at first but then it starts happening sometimes. Not sure under which circumstances; needs more diagnostic logging. BTW sometimes I invoke a fresh Where Used and sometimes press Refresh; not sure if it makes any difference.
The first exception is a duplicate of issue #43168, the second is a duplicate of issue #43519. *** This issue has been marked as a duplicate of 43168 ***