[
https://issues.apache.org/jira/browse/HADOOP-3665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624753#action_12624753
]
Hudson commented on HADOOP-3665:
--------------------------------
Integrated in Hadoop-trunk #581 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/581/])
> WritableComparator newKey() fails for NullWritable
> --------------------------------------------------
>
> Key: HADOOP-3665
> URL: https://issues.apache.org/jira/browse/HADOOP-3665
> Project: Hadoop Core
> Issue Type: Bug
> Components: io
> Affects Versions: 0.16.0
> Environment: n/a
> Reporter: Lukas Vlcek
> Assignee: Chris Douglas
> Priority: Minor
> Fix For: 0.18.0
>
> Attachments: 3665-0.patch, 3665-1.patch, 3665-2.patch,
> HADOOP-3665.path
>
>
> It is not possible to use NullWritable as a key in order to suppress key
> value in output.
> Syndrome exception:
> Caused by: java.lang.IllegalAccessException: Class
> org.apache.hadoop.io.WritableComparator can not access a member of class
> org.apache.hadoop.io.NullWritable with modifiers "private"
> The problem is that NullWritable is a singleton and does not provide public
> non-parametric constructor. The following code in WritableComparator causes
> the exception: return (WritableComparable)keyClass.newInstance();
> Proposed simple solution is to use ReflectionUtils instead (it requires
> modification as well).
> This issue is probably related to HADOOP-2922
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
