Github user ijokarumawak commented on the issue:
https://github.com/apache/nifi/pull/1376
@qfdk Sometimes, I encounter issue while debugging, such as forgetting
terminate old IntelliJ debugger or having other thread being stopped at
different break point, then NiFi jetty thread can't respond. If NiFi UI keeps
showing a little running circle and doesn't update, probably that is the case.
Otherwise, I've been able to debug it with IntelliJ fine.
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