Github user davidyan74 commented on the pull request:
https://github.com/apache/incubator-apex-core/pull/97#issuecomment-145267441
That's because we have to support the description field with apps written
in JSON and properties files, in addition to Java. That's why I want to add
that in the AppFactory interface. Putting it in the javadoc attribute would
work but it would be ugly in the implementation.
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