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https://issues.apache.org/jira/browse/MAHOUT-1612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14385599#comment-14385599
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Hudson commented on MAHOUT-1612:
--------------------------------

SUCCESS: Integrated in Mahout-Quality #3019 (See 
[https://builds.apache.org/job/Mahout-Quality/3019/])
Mahout-1612: NullPointerException happens during JSON output format for 
clusterdumper (suneel.marthi: rev eeca175c3a838a8aaa821cbbcd8d0376bd17939d)
* 
integration/src/main/java/org/apache/mahout/utils/clustering/JsonClusterWriter.java
* CHANGELOG
Mahout-1612: NullPointerException happens during JSON output format for 
clusterdumper, this closes #55 and closes #85 (suneel.marthi: rev 
4de8c58624556983a6745a8841c50fb2a380e0b5)
* 
integration/src/main/java/org/apache/mahout/utils/clustering/JsonClusterWriter.java


> NullPointerException happens during JSON output format for clusterdumper
> ------------------------------------------------------------------------
>
>                 Key: MAHOUT-1612
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1612
>             Project: Mahout
>          Issue Type: Bug
>          Components: Clustering
>    Affects Versions: 0.9
>            Reporter: Guo Ruijing
>            Assignee: Suneel Marthi
>              Labels: legacy
>             Fix For: 0.10.0
>
>
> 1. download datafile from:
> http://archive.ics.uci.edu/ml/databases/synthetic_control/synthetic_control.data
> 2. put data file on hdfs:
> hdfs dfs -mkdir testdata
> hdfs dfs -put synthetic_control.data testdata/
> 3. run a mahout clustering job:
> mahout org.apache.mahout.clustering.syntheticcontrol.kmeans.Job
> 4. run clusterdump with JSON format:
> mahout clusterdump i output/clusters*-final -p output/clusteredPoints -o 
> /tmp/report -of JSON
> expected:
> clusterdump with JSON format should succeeded same as CSV and TEXT
> actually:
> clusterdump with JSON format throw NullPointerException



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