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https://issues.apache.org/jira/browse/ACCUMULO-4068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15047495#comment-15047495
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Keith Turner commented on ACCUMULO-4068:
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Trying to instantiate class seems like a nice check to do, so I would not want
to remove. However we could only do that check if a no-arg constructor exists.
> Unable to check if balancer can load
> ------------------------------------
>
> Key: ACCUMULO-4068
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4068
> Project: Accumulo
> Issue Type: Bug
> Affects Versions: 1.6.4, 1.7.0
> Reporter: Keith Turner
>
> I was trying to use instanceOperations().testClassLoad() to check if a the
> RegExGroupBalancer was available. This class was added in 1.7, so I did not
> want to attempt to configure it in 1.6.
> Unexpectedly the call to testClassLoad() failed in 1.7. I looked into the
> cause and it turns out the implementation of testClassLoad() also tries to
> instantiate the class after loading using a noarg constructor. Because of
> ACCUMULO-4047 the RegexGroupBalancer does not have a noarg constructor.
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