Github user apetresc commented on the pull request:
https://github.com/apache/incubator-storm/pull/50#issuecomment-38327183
The NPE was happening on a `mvn test` from a fresh checkout of
v0.9.1-incubating, so maybe there's some flaw in the way the test suite shuts
down the topology as well. But this patch also fixed it.
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