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https://issues.apache.org/jira/browse/HBASE-18878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16189135#comment-16189135
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Appy commented on HBASE-18878:
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Looks like Optional is not supposed to be used for parameters. (I started
reading around when my IDE showed a little notice on {{Optional<User> user}}.)
-
https://stackoverflow.com/questions/31922866/why-should-java-8s-optional-not-be-used-in-arguments
- http://dolszewski.com/java/java-8-optional-use-cases/
Let me put up a subset of [~Apache9]'s patch.
> Use Optional instead of Nullable annotation in ObserverContext to better
> describe that the caller may not be presented
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-18878
> URL: https://issues.apache.org/jira/browse/HBASE-18878
> Project: HBase
> Issue Type: Sub-task
> Components: Coprocessors
> Reporter: Duo Zhang
> Assignee: Duo Zhang
> Fix For: 2.0.0-alpha-4
>
> Attachments: HBASE-18878.patch, HBASE-18878-v1.patch
>
>
> I've already done lots of Nullable to Optional change when purging the
> interfaces for CP. This is a big one so open a separated issue for it.
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