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https://issues.apache.org/jira/browse/APEXMALHAR-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15645753#comment-15645753
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David Yan commented on APEXMALHAR-2328:
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[~hsy541] can you take a look at this? I am suspecting it's because
ApexWindowedStreamImpl uses the non-session storage as the default, probably
around line 259 of ApexWindowedStreamImpl.java.
> ClassCastException while running TopWikipediaSessions
> -----------------------------------------------------
>
> Key: APEXMALHAR-2328
> URL: https://issues.apache.org/jira/browse/APEXMALHAR-2328
> Project: Apache Apex Malhar
> Issue Type: Bug
> Components: demonstrations, streams
> Reporter: Sanjay M Pujare
>
> in the TopWikipediaSessions demo I saw this stack trace.
> Stram event details
> Stopped running due to an exception. java.lang.ClassCastException:
> org.apache.apex.malhar.lib.window.impl.InMemoryWindowedKeyedStorage cannot be
> cast to org.apache.apex.malhar.lib.window.SessionWindowedStorage
> at
> org.apache.apex.malhar.lib.window.impl.KeyedWindowedOperatorImpl.assignSessionWindows(KeyedWindowedOperatorImpl.java:62)
> at
> org.apache.apex.malhar.lib.window.impl.AbstractWindowedOperator.assignWindows(AbstractWindowedOperator.java:353)
> at
> org.apache.apex.malhar.lib.window.impl.AbstractWindowedOperator.getWindowedValueWithTimestamp(AbstractWindowedOperator.java:317)
> at
> org.apache.apex.malhar.lib.window.impl.AbstractWindowedOperator.processTuple(AbstractWindowedOperator.java:144)
> at
> org.apache.apex.malhar.lib.window.impl.AbstractWindowedOperator$1.process(AbstractWindowedOperator.java:109)
> at
> org.apache.apex.malhar.lib.window.impl.AbstractWindowedOperator$1.process(AbstractWindowedOperator.java:105)
> at com.datatorrent.api.DefaultInputPort.put(DefaultInputPort.java:79)
> at
> com.datatorrent.stram.stream.BufferServerSubscriber$BufferReservoir.sweep(BufferServerSubscriber.java:280)
> at com.datatorrent.stram.engine.GenericNode.run(GenericNode.java:259)
> at
> com.datatorrent.stram.engine.StreamingContainer$2.run(StreamingContainer.java:1415)
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