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https://issues.apache.org/jira/browse/CALCITE-5737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17799722#comment-17799722
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Sergey Nuyanzin commented on CALCITE-5737:
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I converted it to a subtask for java 21 support
since gradle 8.5 is available i submitted a PR to update gradle which supports
java 21 for both java and kotlin parts CALCITE-6174
after that could switch to handling of deprecations
> Support JDK 20
> --------------
>
> Key: CALCITE-5737
> URL: https://issues.apache.org/jira/browse/CALCITE-5737
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Julian Hyde
> Priority: Major
>
> Support JDK 20.
> We currently support JDK (and OpenJDK) versions up to 18. (CALCITE-5747 will
> add support for JDK 19.) JDK 20 is the latest. We should support JDK 20 in
> Calcite 1.35 if possible, or soon after.
> This change would modify history.md (for the upcoming release), add JDK 20 to
> the GitHub CI, and fix the build. There are deprecation warnings (which we
> treat as errors) regarding the java.net.URL constructor.
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