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https://issues.apache.org/jira/browse/CALCITE-3735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17016270#comment-17016270
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Andrei Sereda commented on CALCITE-3735:
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Yes, seems like calling interface default methods reflectively in not
straight-forward in java. Worst, different code for JDK 8, 9-10, 11. This is
one of the advantages of codegen-ed immutable classes.
Probably you already saw [Correct Reflective Access to Interface Default
Methods in Java 8, 9,
10|https://blog.jooq.org/2018/03/28/correct-reflective-access-to-interface-default-methods-in-java-8-9-10/]
post.
> In ImmutableBeans, allow interfaces to have default methods
> -----------------------------------------------------------
>
> Key: CALCITE-3735
> URL: https://issues.apache.org/jira/browse/CALCITE-3735
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Priority: Major
>
> In ImmutableBeans, allow interfaces to have default methods.
> (These are invoked in the usual way by the client. The mechanics are a bit
> tricky because they involve method handles, and the APIs are different in JDK
> 8 than later JDKs.)
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