[jira] [Commented] (CALCITE-2027) Drop support for Java 7 (JDK 1.7)

["Michael Mior (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-2027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16235745#comment-16235745 ] 

Michael Mior commented on CALCITE-2027:
---------------------------------------

Sounds like a good plan to me. I don't really see any need to convert existing code unless a) that code is being changed for other reasons or b) we want to add new interfaces to support Java 8 features.

> Drop support for Java 7 (JDK 1.7)
> ---------------------------------
>
>                 Key: CALCITE-2027
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2027
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>
> Drop support for Java 7 (also known as JDK 1.7):
> * The code would no longer compile under JDK 7
> * Compiler would have source 1.8 target 1.8
> * Class files would run on JDK 8 and higher
> * Developers can use Java 8 syntax such as lambdas and default methods
> We would continue to build and run under JDK 8 and 9.
> I think it would be best to wait a while before converting existing code to Java 8 style (e.g. converting SAM anonymous classes to lambdas) because code changes might be extensive.
> I expect there will be cases that we want to change interfaces so that they are easier to use as lambdas. Let's make those changes cautiously when we come across them, and mark existing interfaces and methods deprecated until we remove them in 2.0.
> Let's give at least one release notice of this change. In 1.15 (the next release) let's announce that this will be the last release that supports Java 7. So this will be fixed for 1.16.



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