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https://issues.apache.org/jira/browse/AVRO-1421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13865687#comment-13865687
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ASF subversion and git services commented on AVRO-1421:
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Commit 1556592 from [~cutting] in branch 'avro/trunk'
[ https://svn.apache.org/r1556592 ]
AVRO-1421. Java: Add an @AvroSchema annotation to reflect.
> [ReflectData] Provide a way for parameterised types to be nullable
> ------------------------------------------------------------------
>
> Key: AVRO-1421
> URL: https://issues.apache.org/jira/browse/AVRO-1421
> Project: Avro
> Issue Type: Improvement
> Components: java
> Affects Versions: 1.7.0
> Reporter: Harsh J
> Assignee: Doug Cutting
> Priority: Minor
> Fix For: 1.7.6
>
> Attachments: AVRO-1421.patch, AVRO-1421.patch
>
>
> Although possible with SpecificData (schema generated classes), the
> ReflectData currently lacks a way to have a declaration such as
> {code}java.util.List<String> myList;{code} to be able to generate a nullable
> schema {code}{ "type": "array", "items": ["null", "string"] }{code} instead
> of the current {code}{ "type": "array", "items": "string" }{code}
> There are {{@Union}} and {{@Nullable}} annotations available, but they cannot
> be applied to the above parameterised Collection declaration.
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