Github user unsleepy22 commented on the pull request: https://github.com/apache/storm/pull/1147#issuecomment-190526220 @revans2 yes I see the exception too when running your test, but looks odd because I've tested all storm ui pages in distributed mode with java stats and everything looks good. The exception is as follows, StatsUtil.filterSysStreams expects a map of {window -> stream id -> value}, while in your test it gets a map of {stream id -> value}. I suppose this happens in local mode only? Though I can manage to make through your test by changing this method a little.
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