[FLINK-4823] org.apache.flink.types.NullFieldException: Field 0 is null, but expected to hold a value

• Type: Bug
• Status: Closed
• Priority: Not a Priority
• Resolution: Won't Fix
• Affects Version/s: 1.1.0
• Component/s: Library / Graph Processing
• Labels: auto-deprioritized-major auto-deprioritized-minor

Environment

RHEL 6.6

• Assignee: Unassigned
• Reporter: Sajeev Ramakrishnan
• Created: 13/Oct/16 11:23
• Updated: 19/Oct/22 11:45
• Resolved: 19/Oct/22 11:45

Description

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