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https://issues.apache.org/jira/browse/FLINK-13647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16970063#comment-16970063
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Gary Yao commented on FLINK-13647:
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Regarding JLS 13.5.6:
How can a pre-existing binary attempt to invoke a new default method? This
should be only possible via reflection which is not common. We could mark new
default methods to be binary compatible in japicmp.
> Allow default methods and static methods to be added to public interfaces
> -------------------------------------------------------------------------
>
> Key: FLINK-13647
> URL: https://issues.apache.org/jira/browse/FLINK-13647
> Project: Flink
> Issue Type: Improvement
> Components: Build System
> Affects Versions: 1.9.0, 1.10.0
> Reporter: Till Rohrmann
> Priority: Major
> Fix For: 1.10.0
>
>
> Since Java 8, it is possible to extend interfaces by adding default methods
> and static methods. Flink's current japicmp plugin won't allow this and
> complains with a {{METHOD_ADDED_TO_INTERFACE}}.
> I think we should allow this in order to extend existing public interfaces.
> There is also a japicmp issue which addresses this problem:
> https://github.com/siom79/japicmp/issues/201.
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