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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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via nutch-user by Lewis John Mcgibbney, 1 year ago
This exception has no message.
via nutch-user by 高睿, 2 years ago
This exception has no message.
via nutch-user by Lewis John Mcgibbney, 1 year ago
This exception has no message.
via nutch-user by 高睿, 2 years ago
This exception has no message.
via Google Groups by Jeremy Custenborder, 10 months ago
via Oracle Community by 432051, 1 year ago
java.lang.NullPointerException: 	at java.util.Hashtable.put(Unknown Source)	at java.util.Properties.setProperty(Unknown Source)	at org.apache.hadoop.conf.Configuration.set(Configuration.java:438)	at org.apache.nutch.indexer.IndexerJob.createIndexJob(IndexerJob.java:128)	at org.apache.nutch.indexer.solr.SolrIndexerJob.run(SolrIndexerJob.java:44)	at org.apache.nutch.crawl.Crawler.runTool(Crawler.java:68)	at org.apache.nutch.crawl.Crawler.run(Crawler.java:192)	at org.apache.nutch.crawl.Crawler.run(Crawler.java:250)	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)	at org.apache.nutch.crawl.Crawler.main(Crawler.java:257)