[GIRAPH-884] ByteArrayEdges.iterator() throws NPE when no edges are present

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.1.0
• Assignee: Unassigned
• Reporter: Craig Muchinsky
• Created: 31/Mar/14 19:24
• Updated: 09/Apr/14 13:20
• Resolved: 09/Apr/14 12:49

Description

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.