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https://issues.apache.org/jira/browse/MAHOUT-1215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13659353#comment-13659353
]
Summer Lee commented on MAHOUT-1215:
------------------------------------
I found that when --similarityClassname (-s) option is omitted then
NullPointerException occur.
> NullPointerException in ItemSimilarityJob
> -----------------------------------------
>
> Key: MAHOUT-1215
> URL: https://issues.apache.org/jira/browse/MAHOUT-1215
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Affects Versions: 0.7
> Environment: hadoop etc
> Reporter: LEE YOONJAE
> Assignee: Sean Owen
> Labels: CF,recommendation,als, NullPointerException,
> Fix For: 0.7
>
>
> <---command--->
> hadoop --config /engn001/sbp/scm/role/namenode/conf jar
> /home/hdfs/mahout_test/mahout-core-0.7-job.jar
> \org.apache.mahout.cf.taste.hadoop.similarity.item.ItemSimilarityJob
> --input /user/hdfs/mahout_test/input/mahout_input_final3_0.csv
> --output /user/hdfs/mahout_test/output/final3/ItemSimilarity
> <---error message--->
> Exception in thread "main" java.lang.NullPointerException
> at java.lang.String.<init>(String.java:147)
> at org.apache.commons.cli2.commandline.Parser.parse(Parser.java:66)
> at
> org.apache.mahout.common.AbstractJob.parseArguments(AbstractJob.java:347)
> at
> org.apache.mahout.common.AbstractJob.parseArguments(AbstractJob.java:317)
> at
> org.apache.mahout.math.hadoop.similarity.cooccurrence.RowSimilarityJob.run(RowSimilarityJob.java:91)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
> at
> org.apache.mahout.cf.taste.hadoop.similarity.item.ItemSimilarityJob.run(ItemSimilarityJob.java:145)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
> at
> org.apache.mahout.cf.taste.hadoop.similarity.item.ItemSimilarityJob.main(ItemSimilarityJob.java:91)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
> when I first did, it was successful, but in second time,
> Exception in thread "main" java.lang.NullPointerException error occured
> so I removed that temp directory,
> and then in third time, NullPointerException occured.
> Why is this error ocurred? and How can I fix it??
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