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https://issues.apache.org/jira/browse/BEAM-6839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17351298#comment-17351298
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Brian Hulette commented on BEAM-6839:
-------------------------------------
[~bala.divvela] I think the issue here is we haven't been able to reproduce the
problem. Are you seeing it reliably?
If so it would be helpful to know what is on your classpath and/or what
dependencies you're using in your project.
> User reports protobuf ClassChangeError running against 2.6.0 or above
> ---------------------------------------------------------------------
>
> Key: BEAM-6839
> URL: https://issues.apache.org/jira/browse/BEAM-6839
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow
> Reporter: Kenneth Knowles
> Priority: P1
>
> https://stackoverflow.com/questions/55146663/issue-while-running-dataflow/55171101?noredirect=1#comment97081527_55171101
> {code}
> java.lang.IncompatibleClassChangeError: Class
> org.apache.beam.model.pipeline.v1.RunnerApi$StandardPTransforms$Primitives
> does not implement the requested interface
> com.google.protobuf.ProtocolMessageEnum at
> org.apache.beam.runners.core.construction.BeamUrns.getUrn(BeamUrns.java:27)
> at
> org.apache.beam.runners.core.construction.PTransformTranslation.(PTransformTranslation.java:58)
> at
> org.apache.beam.runners.core.construction.UnconsumedReads$1.visitValue(UnconsumedReads.java:49)
> at
> org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:666)
> at
> org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:649)
> at
> org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:649)
> at
> org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:649)
> at
> org.apache.beam.sdk.runners.TransformHierarchy$Node.access$600(TransformHierarchy.java:311)
> at
> org.apache.beam.sdk.runners.TransformHierarchy.visit(TransformHierarchy.java:245)
> at org.apache.beam.sdk.Pipeline.traverseTopologically(Pipeline.java:458) at
> org.apache.beam.runners.core.construction.UnconsumedReads.ensureAllReadsConsumed(UnconsumedReads.java:40)
> at
> org.apache.beam.runners.dataflow.DataflowRunner.replaceTransforms(DataflowRunner.java:868)
> at
> org.apache.beam.runners.dataflow.DataflowRunner.run(DataflowRunner.java:660)
> at
> org.apache.beam.runners.dataflow.DataflowRunner.run(DataflowRunner.java:173)
> at org.apache.beam.sdk.Pipeline.run(Pipeline.java:313) at
> org.apache.beam.sdk.Pipeline.run(Pipeline.java:299)
> {code}
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