Github user mmiklavc commented on the issue:
https://github.com/apache/incubator-metron/pull/463
@cestella @justinleet Hm, those should theoretically be the same in this
case. doAnswer() is just a different implementation for dealing with void
return methods.
http://static.javadoc.io/org.mockito/mockito-core/2.7.11/org/mockito/Mockito.html#doAnswer(org.mockito.stubbing.Answer)
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