Robert Metzger commented on FLINK-629:

This screenshot from github is related I guess 
So your problem is that your input format is getting a "null" instead a 
reference to a "Tweet" object?
Is Flink treating your POJO (Tweet) as a POJO or as a generic type?
What is {{TypeExtractor.createTypeInfo(Tweet.class)}} returning?

> 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
>         Attachments: model.tar.gz
> 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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