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From "Craig Muchinsky (JIRA)" <j...@apache.org>
Subject [jira] [Created] (GIRAPH-884) ByteArrayEdges.iterator() throws NPE when no edges are present
Date Mon, 31 Mar 2014 19:26:14 GMT
Craig Muchinsky created GIRAPH-884:
--------------------------------------

             Summary: ByteArrayEdges.iterator() throws NPE when no edges are present
                 Key: GIRAPH-884
                 URL: https://issues.apache.org/jira/browse/GIRAPH-884
             Project: Giraph
          Issue Type: Bug
            Reporter: Craig Muchinsky
         Attachments: GIRAPH-884.patch

The ByteArrayEdges.iterator() method throws the following NPE when no edges are present:

2014-03-31 14:44:46,273 ERROR org.apache.giraph.utils.LogStacktraceCallable: Execution of
callable failed
java.lang.NullPointerException
	at java.io.ByteArrayInputStream.<init>(ByteArrayInputStream.java:120)
	at org.apache.giraph.utils.ExtendedByteArrayDataInput.<init>(ExtendedByteArrayDataInput.java:50)
	at org.apache.giraph.conf.ImmutableClassesGiraphConfiguration.createExtendedDataInput(ImmutableClassesGiraphConfiguration.java:1009)
	at org.apache.giraph.edge.ByteArrayEdges$ByteArrayEdgeIterator.<init>(ByteArrayEdges.java:141)
	at org.apache.giraph.edge.ByteArrayEdges$ByteArrayEdgeIterator.<init>(ByteArrayEdges.java:138)
	at org.apache.giraph.edge.ByteArrayEdges.iterator(ByteArrayEdges.java:167)

Simply checking the edgeCount before constructing a new ByteArrayEdgeIterator solves the problem.




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