Mike Pedersen created FLINK-10375:
-------------------------------------

             Summary: ExceptionInChainedStubException hides wrapped exception 
in cause
                 Key: FLINK-10375
                 URL: https://issues.apache.org/jira/browse/FLINK-10375
             Project: Flink
          Issue Type: Bug
          Components: Core
            Reporter: Mike Pedersen


ExceptionInChainedStubException does not have the wrapped exception as the 
cause. This creates generally unhelpful exception traces like this:
{code:java}
org.apache.beam.sdk.util.UserCodeException: 
org.apache.flink.runtime.operators.chaining.ExceptionInChainedStubException
        at 
org.apache.beam.sdk.util.UserCodeException.wrap(UserCodeException.java:36)
        at 
org.apache.beam.sdk.io.WriteFiles$ApplyShardingKeyFn$DoFnInvoker.invokeProcessElement(Unknown
 Source)
        at 
org.apache.beam.runners.core.SimpleDoFnRunner.invokeProcessElement(SimpleDoFnRunner.java:185)
        at 
org.apache.beam.runners.core.SimpleDoFnRunner.processElement(SimpleDoFnRunner.java:149)
        at 
org.apache.beam.runners.flink.metrics.DoFnRunnerWithMetricsUpdate.processElement(DoFnRunnerWithMetricsUpdate.java:66)
        at 
org.apache.beam.runners.flink.translation.functions.FlinkDoFnFunction.mapPartition(FlinkDoFnFunction.java:120)
        at 
org.apache.flink.runtime.operators.MapPartitionDriver.run(MapPartitionDriver.java:103)
        at org.apache.flink.runtime.operators.BatchTask.run(BatchTask.java:490)
        at 
org.apache.flink.runtime.operators.BatchTask.invoke(BatchTask.java:355)
        at org.apache.flink.runtime.taskmanager.Task.run(Task.java:718)
        at java.lang.Thread.run(Thread.java:748)
Caused by: 
org.apache.flink.runtime.operators.chaining.ExceptionInChainedStubException
        at 
org.apache.flink.runtime.operators.chaining.ChainedFlatMapDriver.collect(ChainedFlatMapDriver.java:82)
        at 
org.apache.flink.runtime.operators.util.metrics.CountingCollector.collect(CountingCollector.java:35)
        at 
org.apache.beam.runners.flink.translation.functions.FlinkDoFnFunction$DoFnOutputManager.output(FlinkDoFnFunction.java:149)
        at 
org.apache.beam.runners.core.SimpleDoFnRunner.outputWindowedValue(SimpleDoFnRunner.java:219)
        at 
org.apache.beam.runners.core.SimpleDoFnRunner.access$700(SimpleDoFnRunner.java:69)
        at 
org.apache.beam.runners.core.SimpleDoFnRunner$DoFnProcessContext.output(SimpleDoFnRunner.java:517)
        at 
org.apache.beam.runners.core.SimpleDoFnRunner$DoFnProcessContext.output(SimpleDoFnRunner.java:505)
        at 
org.apache.beam.sdk.io.WriteFiles$ApplyShardingKeyFn.processElement(WriteFiles.java:686)
{code}



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