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https://issues.apache.org/jira/browse/FLINK-2665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14743420#comment-14743420
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Till Rohrmann commented on FLINK-2665:
--------------------------------------
It's actually not possible to add the bounds, because
{{ExecutionConfig.Entry<Class<?>, Serializer<?>>}} is used to store Kryo
serializers in the execution config. Kryo serializers are, however, not
serializable. Interestingly though, in some methods which are used to add
{{Serializers}} to the {{ExecutionConfig}}, it is checked whether the
{{Serializer}} instance implements the {{Serializable}} interface and if not,
fails. But this does not happen during compile time. I guess this should be
reworked as well.
> ExecutionConfig is not serializable
> -----------------------------------
>
> Key: FLINK-2665
> URL: https://issues.apache.org/jira/browse/FLINK-2665
> Project: Flink
> Issue Type: Bug
> Reporter: Till Rohrmann
>
> The {{ExecutionConfig}} is not serializable, because the
> {{ExecutionConfig.Entry<K,V>}} can contain non serializable key and value
> field values.
> I suggest to add a type bound for {{K}} and {{V}}.
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