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From "Etienne Chauchot (JIRA)" <>
Subject [jira] [Created] (BEAM-2499) Fail to merge Custom Windows in Spark runner
Date Thu, 22 Jun 2017 14:56:00 GMT
Etienne Chauchot created BEAM-2499:

             Summary: Fail to merge Custom Windows in Spark runner
                 Key: BEAM-2499
             Project: Beam
          Issue Type: Bug
          Components: runner-spark
            Reporter: Etienne Chauchot
            Assignee: Amit Sela

If we extend {{IntervalWindow}} and we try to merge these custom windows like in this PR:
Then spark runner fails with 

{{org.apache.beam.sdk.Pipeline$PipelineExecutionException: java.lang.ClassCastException: org.apache.beam.sdk.transforms.windowing.IntervalWindow
cannot be cast to org.apache.beam.sdk.transforms.windowing.MergingCustomWindowsTest$CustomWindow}}

It seems to be because of the cast to {{IntervalWindow}} there:

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