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From "Ryan Blue (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AVRO-1604) ReflectData.AllowNull fails to generate schemas when @Nullable is present.
Date Wed, 24 Jun 2015 19:05:04 GMT

    [ https://issues.apache.org/jira/browse/AVRO-1604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14599963#comment-14599963

Ryan Blue commented on AVRO-1604:

[~ericsodt], I think the schema you've generated looks correct. This issue addressed an error
thrown when generating the schema. But your schema appears to have been generated without
errors and looks fine.

The problem that you're hitting is because your JSON doesn't conform to Avro's [JSON encoding
spec|https://avro.apache.org/docs/1.7.7/spec.html#json_encoding]. The union should have an
extra layer to tell Avro which type in the union should be used. You can also use other utilities
to do this conversion. Kite, for example, has support for converting non-Avro JSON records
to Avro.

> ReflectData.AllowNull fails to generate schemas when @Nullable is present.
> --------------------------------------------------------------------------
>                 Key: AVRO-1604
>                 URL: https://issues.apache.org/jira/browse/AVRO-1604
>             Project: Avro
>          Issue Type: Bug
>            Reporter: Ryan Blue
>            Assignee: Ryan Blue
>             Fix For: 1.8.0
>         Attachments: AVRO-1604-1.patch
> The {{@Nullable}} annotation causes a failure because the {{makeNullable(Schema)}} method
assumes that the type passed in is not already a union. When it is a union, either from using
{{Nullable}}, {{AvroSchema}}, or a {{Union}}-annotated type, an exception is thrown that unions
can't contain unions.

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