Github user nickwallen commented on the issue:
https://github.com/apache/metron/pull/1012
I made two updates.
* I added the additional test check to `StellarProcessorUtils` to ensure
the value returned is Java serializable. There were a few classes that I had
to update for the tests to continue to pass. All simple cases where a class
just needed to implement Serializable.
* Updated all Profiler classes to be Java serializable in case a user
chooses to use Java serialization in their Storm topology. This is not
recommended, but there is no reason to block a user from doing so.
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