Markus Jelsma created NUTCH-1596:
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Summary: NodeWalker NPE on next node
Key: NUTCH-1596
URL: https://issues.apache.org/jira/browse/NUTCH-1596
Project: Nutch
Issue Type: Bug
Affects Versions: 1.7
Reporter: Markus Jelsma
Assignee: Markus Jelsma
Fix For: 1.8
The NodeWalker used by the HeadingsParseFilter sometimes reports a
NullPointerException.
{code}
2013-07-02 11:02:09,428 WARN parse.ParseUtil - Error parsing .... with
org.apache.nutch.parse.tika.TikaParser@2c8b586a
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:262)
at java.util.concurrent.FutureTask.get(FutureTask.java:119)
at org.apache.nutch.parse.ParseUtil.runParser(ParseUtil.java:162)
at org.apache.nutch.parse.ParseUtil.parse(ParseUtil.java:93)
at
org.apache.nutch.fetcher.Fetcher$FetcherThread.output(Fetcher.java:963)
at org.apache.nutch.fetcher.Fetcher$FetcherThread.run(Fetcher.java:722)
Caused by: java.lang.NullPointerException
at org.apache.xerces.dom.ParentNode.nodeListItem(Unknown Source)
at org.apache.xerces.dom.ParentNode.item(Unknown Source)
at org.apache.nutch.util.NodeWalker.nextNode(NodeWalker.java:75)
at
org.apache.nutch.parse.headings.HeadingsParseFilter.getElement(HeadingsParseFilter.java:84)
at
org.apache.nutch.parse.headings.HeadingsParseFilter.filter(HeadingsParseFilter.java:47)
at
org.apache.nutch.parse.HtmlParseFilters.filter(HtmlParseFilters.java:98)
at org.apache.nutch.parse.tika.TikaParser.getParse(TikaParser.java:210)
at org.apache.nutch.parse.ParseCallable.call(ParseCallable.java:35)
at org.apache.nutch.parse.ParseCallable.call(ParseCallable.java:24)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
{code}
This is strange because it only rarely fails and the nextNode() method checks
hasNext() and there is no concurrent access if i'm correct.
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