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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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