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https://issues.apache.org/jira/browse/FLINK-4783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15561665#comment-15561665
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Timo Walther commented on FLINK-4783:
-------------------------------------
Stephan and I had a discussion about globally assigned TypeInfoFactories. The
reason why this method is not public (and intended for future use of internal
TypeInformation such as basic types) is that all type extractor methods are
static. Registering factories also statically could cause unintended side
effects, if the factory is registered/unregistered at wrong positions in the
code.
> Allow to register TypeInfoFactories manually
> --------------------------------------------
>
> Key: FLINK-4783
> URL: https://issues.apache.org/jira/browse/FLINK-4783
> Project: Flink
> Issue Type: Improvement
> Components: Type Serialization System
> Affects Versions: 1.2.0
> Reporter: Till Rohrmann
> Priority: Minor
> Fix For: 1.2.0
>
>
> The newly introduced {{TypeInfoFactories}} (FLINK-3042 and FLINK-3060) allow
> to create {{TypeInformations}} for types which are annotated with
> {{TypeInfo}}. This is useful if the user has control over the type for which
> he wants to generate the {{TypeInformation}}.
> However, annotating a type is not always possible if the type comes from an
> external library. In this case, it would be good to be able to directly
> register a {{TypeInfoFactory}} without having to annotate the type.
> The {{TypeExtractor#registerFactory}} already has such a method. However, it
> is declared private.
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