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Posted to commits@beam.apache.org by "Manu Zhang (JIRA)" <ji...@apache.org> on 2016/06/16 12:41:05 UTC
[jira] [Commented] (BEAM-328) CoderRegistry does not provide
SerializableCoder for `T extends Serializable`
[ https://issues.apache.org/jira/browse/BEAM-328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15333697#comment-15333697 ]
Manu Zhang commented on BEAM-328:
---------------------------------
It seems that {{TypeVariable}} cannot be cast a {{Class<?>}}
> CoderRegistry does not provide SerializableCoder for `T extends Serializable`
> -----------------------------------------------------------------------------
>
> Key: BEAM-328
> URL: https://issues.apache.org/jira/browse/BEAM-328
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Kenneth Knowles
> Assignee: Manu Zhang
> Priority: Minor
> Labels: starter
>
> When the type for which a coder is being inferred is a type variable with an upper bound of {{Serializable}}, it is reasonable for the coder registry to propagate this to the {{SerializableCoder.PROVIDER}}, which should be able to succeed.
> Unfortunately, the particulars of the distinctions made between {{Type}}, {{Class}}, {{TypeVariable}}, {{ParameterizedType}}, etc, go down a code path where this is not the case. Instead, an error is raised that the type variable has been subject to erasure.
> Originally reported at: https://github.com/GoogleCloudPlatform/DataflowJavaSDK/issues/298
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