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

["Julian Hyde (JIRA)" <ji...@apache.org>]

Julian Hyde created CALCITE-2027:
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             Summary: 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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