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From: "Craig Muchinsky (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (GIRAPH-884) ByteArrayEdges.iterator() throws
 NPE when no edges are present
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    [ https://issues.apache.org/jira/browse/GIRAPH-884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13956732#comment-13956732 ] 

Craig Muchinsky commented on GIRAPH-884:
----------------------------------------

I'm pretty sure the line number difference in ByteArrayInputStream is related to the fact that I'm using the IBM JDK.

> 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
>             Fix For: 1.1.0
>
>         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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