tree 6491748ee389d261dc5c1ee3f3550f8ce9ec1157
parent 8e3d87d60c6e660e36cb830f0e44d6fe81e24db3
author David Pursehouse <david.pursehouse@sonymobile.com> 1457502350 +0900
committer David Pursehouse <david.pursehouse@sonymobile.com> 1457504824 +0900

ChangeEventListener: Improve exception handling

If the configuration includes a username or email address that is
misspelled or has the incorrect case, the error log is filled up
with logs like:

Cannot resolve reviewer: User.Name
com.google.gerrit.extensions.restapi.UnprocessableEntityException: Group Not Found: User.Name
        at com.google.gerrit.server.group.GroupsCollection.parse(GroupsCollection.java:113)
        ...

This is misleading, because the problem is not actually caused by a
missing group.

Refactor the checks for account and group to handle exceptions
separately, and log appropriate warnings.

Change-Id: Ie29810e5edb9a5ebe9c603f288c17099aea875e9