Github user apiri commented on the pull request:
https://github.com/apache/nifi/pull/91#issuecomment-153554654
You are not including your nar in the nifi-assembly pom (and would want to
include this in the root pom.xml as a managed dependency for versioning) and it
was not getting included in the generated assemblies.
Additionally, it seems as though your nifi-riemann-processors does not have
the requisite META-INF/services/org.apache.nifi.processor.Processor file for
SPI. Accordingly, it was not getting loaded on NiFi startup as an available
processor.
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