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https://issues.apache.org/jira/browse/FLINK-629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14243955#comment-14243955
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Robert Metzger commented on FLINK-629:
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Okay, it seems that the Tweet class is being handled by Avro.
We are working on replacing the generic serialization by a better framework
(Kryo).
Can you also post the de.tu_berlin.impro3.flink.model.tweet.Tweet class here?
If we can make the class a POJO / bean-style class, we can resolve the issue.
> Add support for null values to the java api
> -------------------------------------------
>
> Key: FLINK-629
> URL: https://issues.apache.org/jira/browse/FLINK-629
> Project: Flink
> Issue Type: Improvement
> Components: Java API
> Reporter: Stephan Ewen
> Assignee: Gyula Fora
> Priority: Critical
> Labels: github-import
> Fix For: pre-apache
>
>
> Currently, many runtime operations fail when encountering a null value. Tuple
> serialization should allow null fields.
> I suggest to add a method to the tuples called `getFieldNotNull()` which
> throws a meaningful exception when the accessed field is null. That way, we
> simplify the logic of operators that should not dead with null fields, like
> key grouping or aggregations.
> Even though SQL allows grouping and aggregating of null values, I suggest to
> exclude this from the java api, because the SQL semantics of aggregating null
> fields are messy.
> ---------------- Imported from GitHub ----------------
> Url: https://github.com/stratosphere/stratosphere/issues/629
> Created by: [StephanEwen|https://github.com/StephanEwen]
> Labels: enhancement, java api,
> Milestone: Release 0.5.1
> Created at: Wed Mar 26 00:27:49 CET 2014
> State: open
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