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https://issues.apache.org/jira/browse/HBASE-6049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13285934#comment-13285934
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Hudson commented on HBASE-6049:
-------------------------------

Integrated in HBase-TRUNK #2955 (See 
[https://builds.apache.org/job/HBase-TRUNK/2955/])
    HBASE-6049 Serializing 'List' containing null elements will cause 
NullPointerException in HbaseObjectWritable.writeObject() (Revision 1344363)

     Result = FAILURE
stack : 
Files : 
* 
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/io/HbaseObjectWritable.java
* 
/hbase/trunk/hbase-server/src/test/java/org/apache/hadoop/hbase/io/TestHbaseObjectWritable.java

                
> Serializing "List" containing null elements will cause NullPointerException 
> in HbaseObjectWritable.writeObject()
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-6049
>                 URL: https://issues.apache.org/jira/browse/HBASE-6049
>             Project: HBase
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 0.94.0
>            Reporter: Maryann Xue
>            Assignee: Maryann Xue
>             Fix For: 0.96.0, 0.94.1
>
>         Attachments: 6049-v3.patch, HBASE-6049-v2.patch, HBASE-6049-v3.patch, 
> HBASE-6049.patch
>
>
> An error case could be in Coprocessor AggregationClient, the median() 
> function handles an empty region and returns a List Object with the first 
> element as a Null value. NPE occurs in the RPC response stage and the 
> response never gets sent.

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