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Greg Hogan commented on FLINK-4823: ----------------------------------- Adding \{code\} before and after this code block will format much more nicely. > org.apache.flink.types.NullFieldException: Field 0 is null, but expected to > hold a value > ---------------------------------------------------------------------------------------- > > Key: FLINK-4823 > URL: https://issues.apache.org/jira/browse/FLINK-4823 > Project: Flink > Issue Type: Bug > Components: Gelly > Affects Versions: 1.1.0 > Environment: RHEL 6.6 > Reporter: Sajeev Ramakrishnan > Priority: Blocker > > Team, > We are getting NULL pointer exception while doing the vertex centric graph > traversal. > org.apache.flink.types.NullFieldException: Field 0 is null, but expected to > hold a value. > at > org.apache.flink.api.java.typeutils.runtime.TupleSerializer.serialize(TupleSerializer.java:126) > at > org.apache.flink.api.java.typeutils.runtime.TupleSerializer.serialize(TupleSerializer.java:30) > at > org.apache.flink.runtime.plugable.SerializationDelegate.write(SerializationDelegate.java:56) > at > org.apache.flink.runtime.io.network.api.serialization.SpanningRecordSerializer.addRecord(SpanningRecordSerializer.java:83) > at > org.apache.flink.runtime.io.network.api.writer.RecordWriter.emit(RecordWriter.java:85) > at > org.apache.flink.runtime.operators.shipping.OutputCollector.collect(OutputCollector.java:65) > at > org.apache.flink.api.java.operators.JoinOperator$DefaultJoin$WrappingFlatJoinFunction.join(JoinOperator.java:572) > at > org.apache.flink.runtime.operators.JoinWithSolutionSetFirstDriver.run(JoinWithSolutionSetFirstDriver.java:196) > at > org.apache.flink.runtime.operators.BatchTask.run(BatchTask.java:486) > at > org.apache.flink.runtime.iterative.task.AbstractIterativeTask.run(AbstractIterativeTask.java:146) > at > org.apache.flink.runtime.iterative.task.IterationIntermediateTask.run(IterationIntermediateTask.java:92) > at > org.apache.flink.runtime.operators.BatchTask.invoke(BatchTask.java:351) > at org.apache.flink.runtime.taskmanager.Task.run(Task.java:584) > at java.lang.Thread.run(Thread.java:745) > Caused by: java.lang.NullPointerException > at > org.apache.flink.api.java.typeutils.runtime.TupleSerializer.serialize(TupleSerializer.java:122) > at > org.apache.flink.api.java.typeutils.runtime.TupleSerializer.serialize(TupleSerializer.java:30) > at > org.apache.flink.api.java.typeutils.runtime.TupleSerializer.serialize(TupleSerializer.java:124) > ... 13 more > All the parameters that I am passing for the vertex and edges are not null. > Not able to find out the root cause. > Thanks & Regards, > Sajeev Ramakrishnan -- This message was sent by Atlassian JIRA (v6.3.4#6332)