Github user jerrypeng commented on the pull request:
https://github.com/apache/storm/pull/785#issuecomment-146248821
Writing another validator like IntegerValidator(min=0, nullAllowed=true) is
a trivial task, but I think we need to first focus on setting a standard of
using annotations in general. There could be a lot of refactoring done for the
validator's but I am not sure if that is in the scope of this Jira
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