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https://issues.apache.org/jira/browse/MAHOUT-353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851465#action_12851465
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Sean Owen commented on MAHOUT-353:
----------------------------------
I can fix the NPE (just did) but I think there is still an issue here. It's not
able to load a column vector that was previously generated. Try it again now to
gather more information as I look into it.
> java.lang.NullPointerException in RecommenderMapper
> ---------------------------------------------------
>
> Key: MAHOUT-353
> URL: https://issues.apache.org/jira/browse/MAHOUT-353
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Affects Versions: 0.4
> Reporter: Hui Wen Han
> Fix For: 0.4
>
>
> java.lang.NullPointerException
> at
> org.apache.mahout.cf.taste.hadoop.item.RecommenderMapper$CooccurrenceCache.get(RecommenderMapper.java:169)
> at
> org.apache.mahout.cf.taste.hadoop.item.RecommenderMapper$CooccurrenceCache.get(RecommenderMapper.java:154)
> at
> org.apache.mahout.cf.taste.impl.common.Cache.getAndCacheValue(Cache.java:125)
> at org.apache.mahout.cf.taste.impl.common.Cache.get(Cache.java:94)
> at
> org.apache.mahout.cf.taste.hadoop.item.RecommenderMapper.map(RecommenderMapper.java:111)
> at
> org.apache.mahout.cf.taste.hadoop.item.RecommenderMapper.map(RecommenderMapper.java:52)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
> at org.apache.hadoop.mapred.Child.main(Child.java:170)
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