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https://issues.apache.org/jira/browse/FLINK-7450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479147#comment-16479147
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ASF GitHub Bot commented on FLINK-7450:
---------------------------------------

GitHub user twalthr opened a pull request:

    https://github.com/apache/flink/pull/6034

    [FLINK-7450] [types] Fix type extraction of bounded generic POJO fields

    ## What is the purpose of the change
    
    This PR fixes the type extraction of POJO fields with bounded generics. 
Before those fields were treated as unknown fields with `Object` type in Kryo. 
This PR breaks backwards compatibility for jobs with such special cases. We 
need to discuss if we want to do that.
    
    ## Brief change log
    
    - Use generic bounds of type variables during POJO extraction
    
    
    ## Verifying this change
    
    - Two unit tests have been added
    
    ## Does this pull request potentially affect one of the following parts:
    
      - Dependencies (does it add or upgrade a dependency): no
      - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: no
      - The serializers: yes
      - The runtime per-record code paths (performance sensitive): no
      - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: no
      - The S3 file system connector: no
    
    ## Documentation
    
      - Does this pull request introduce a new feature? no
      - If yes, how is the feature documented? JavaDocs


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/twalthr/flink FLINK-7450

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/6034.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #6034
    
----
commit d94eda3b85273603e92ce41ec269494be512758d
Author: Timo Walther <twalthr@...>
Date:   2018-05-17T14:12:54Z

    [FLINK-7450] [types] Fix type extraction of bounded generic POJO fields

----


> Bounded generic POJO field is identified as Object by TypeExtractor
> -------------------------------------------------------------------
>
>                 Key: FLINK-7450
>                 URL: https://issues.apache.org/jira/browse/FLINK-7450
>             Project: Flink
>          Issue Type: Bug
>          Components: Type Serialization System
>    Affects Versions: 1.4.0, 1.3.2
>            Reporter: Timo Walther
>            Assignee: Timo Walther
>            Priority: Major
>
> The TypeExtractor does not correctly handle POJO fields with bounded generics.
> For example:
> {code}
> public class Foo<SomeKey extends BarKey> implements Serializable {
>     public SomeKey someKey;
>     public Foo() {}
>     public Foo(SomeKey someKey) {
>         this.someKey = someKey;
>     }
> }
> {code}
> Is identified as:
> {code}
> PojoType<org.apache.flink.streaming.examples.wordcount.WordCount$Foo, fields 
> = [someKey: GenericType<java.lang.Object>]>
> {code}
> So even though the reflection field has a type, the type information only 
> describes a Object class.



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