[jira] [Comment Edited] (BEAM-328) CoderRegistry does not provide SerializableCoder for `T extends Serializable`

["Manu Zhang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15333697#comment-15333697 ] 

Manu Zhang edited comment on BEAM-328 at 6/16/16 12:40 PM:
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It seems that {{TypeVariable}} cannot be cast to a {{Class<?>}}


was (Author: mauzhang):
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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