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https://issues.apache.org/jira/browse/MRUNIT-70?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13218302#comment-13218302
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Brock Noland commented on MRUNIT-70:
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Writables must have a default constructor because they are created via
reflection. WritableSerialization, the class, does the same thing we do via
ReflectionUtils. Are you not using Writables?
https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1/src/core/org/apache/hadoop/io/serializer/
> copy(orig, conf) in Serialization shouldn't require objects to have a no-args
> constructor, and copy(orig, copy, conf) seems to violate contract for
> deserializer.deserialize()
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: MRUNIT-70
> URL: https://issues.apache.org/jira/browse/MRUNIT-70
> Project: MRUnit
> Issue Type: Bug
> Affects Versions: 0.8.0
> Reporter: Meloss Xeloss
> Priority: Minor
>
> The copy(orig, conf) method requires objects to have a no-args constructor,
> which is non-ideal, since it passes on to Deserializer.deserialize, which can
> create a new object if passed in null. Additionally, the contract for
> deserialize only _can_ fill in the object passed in, so the copy method will
> not perform as expected if it does not.
> http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/io/serializer/Deserializer.html#deserialize%28T%29
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