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https://issues.apache.org/jira/browse/BEAM-1786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15977572#comment-15977572
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Luke Cwik commented on BEAM-1786:
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Users should look at
https://github.com/apache/beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/coders/CoderRegistrar.java
> AutoService registration of coders, like we do with PipelineRunners
> -------------------------------------------------------------------
>
> Key: BEAM-1786
> URL: https://issues.apache.org/jira/browse/BEAM-1786
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-core
> Reporter: Kenneth Knowles
> Assignee: Luke Cwik
> Fix For: First stable release
>
>
> Today, registering coders for auxiliary data types for a library transform is
> not very convenient. It the appears in an output/covariant position then it
> might be possible to use {{getDefaultOutputCoder}} to solve things. But for
> writes/contravariant positions this is not applicable and the library
> transform must contort itself to avoid requiring the user to come up with a
> coder for a type they don't own.
> Probably the best case today is an explicit call to
> {{LibraryTransform.registerCoders(Pipeline)}} which is far too manual.
> This could likely be solved quite easily with {{@AutoService}} and a static
> global coder registry, as we do with pipeline runners.
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