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https://issues.apache.org/jira/browse/HADOOP-120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12527245
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camerooni edited comment on HADOOP-120 at 9/13/07 1:27 PM:
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Yes, that's definitely a better fix and if anyone is using ArrayWritable's 
default constructor, it should be easy to change.

      was (Author: camerooni):
    Yes, that's definitely a better fix and if anyone is using ArrayWritable's 
default constructor, it sould be easy to change.
  
> Reading an ArrayWriter does not work because valueClass does not get 
> initialized
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-120
>                 URL: https://issues.apache.org/jira/browse/HADOOP-120
>             Project: Hadoop
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 0.15.0
>         Environment: Red Hat  
>            Reporter: Dick King
>            Assignee: Doug Cutting
>         Attachments: HADOOP-120-3.patch, hadoop-120-fix.patch, 
> hadoop-120-workaround.patch
>
>
> If you have a Reducer whose value type is an ArrayWriter it gets enstreamed 
> alright but at reconstruction type when ArrayWriter::readFields(DataInput in) 
> runs on a DataInput that has a nonempty ArrayWriter , newInstance fails 
> trying to instantiate the null class.

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