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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