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https://issues.apache.org/jira/browse/NUTCH-2719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16916796#comment-16916796
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ASF GitHub Bot commented on NUTCH-2719:
---------------------------------------

r0ann3l commented on pull request #465: NUTCH-2719: An exchange points to an 
index writer not available
URL: https://github.com/apache/nutch/pull/465
 
 
   When an exchange points to a non-existent index writer, Nutch logs a warning 
indicating the inconsistent configuration and avoids the current NPE.
 
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> NPE if exchanges.xml uses index writer not available
> ----------------------------------------------------
>
>                 Key: NUTCH-2719
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2719
>             Project: Nutch
>          Issue Type: Improvement
>          Components: indexer
>    Affects Versions: 1.15
>            Reporter: Sebastian Nagel
>            Assignee: Roannel Fernández Hernández
>            Priority: Major
>             Fix For: 1.16
>
>
> If the exchanges.xml uses an index writer not present (e.g., because the 
> plugin is not in plugin.includes) the index job fails with a NPE:
> {noformat}
> java.lang.Exception: java.lang.NullPointerException
>         at 
> org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462)
>         at 
> org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:529)
> Caused by: java.lang.NullPointerException
>         at org.apache.nutch.indexer.IndexWriters.write(IndexWriters.java:222)
>         at 
> org.apache.nutch.indexer.IndexerOutputFormat$1.write(IndexerOutputFormat.java:62)
>         at 
> org.apache.nutch.indexer.IndexerOutputFormat$1.write(IndexerOutputFormat.java:47)
>         at 
> org.apache.hadoop.mapred.ReduceTask$NewTrackingRecordWriter.write(ReduceTask.java:558)
> {noformat}
> This should be caught gracefully with a message about an inconsistent 
> configuration.



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