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From "Sebastian Nagel (JIRA)" <j...@apache.org>
Subject [jira] [Created] (NUTCH-2719) NPE if exchanges.xml uses index writer not available
Date Wed, 22 May 2019 15:04:00 GMT
Sebastian Nagel created NUTCH-2719:
--------------------------------------

             Summary: 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
             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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