Integrated: 8155591: Misleading warning when not overriding close method in interface extending AutoCloseable

[Archie Cobbs]

On Tue, 2 Sep 2025 23:35:52 GMT, Archie Cobbs <acobbs at openjdk.org> wrote:

> The compiler generates a warning if you declare a `close()` method that throws any supertype of `InterruptedException` in a class or interface extending `AutoCloseable`. This is because suppressed `InterruptedException`'s are likely to lead to misbehavior at runtime.
> 
> However, this feature also generates a warning due to `AutoCloseable.close()` itself, if you simply inherit it. For example:
> 
> $ cat MyClass.java
> public interface MyClass extends AutoCloseable {
> }
> $ javac -Xlint:try MyClass.java
> MyClass.java:1: warning: [try] auto-closeable resource MyClass has a member method close() that could throw InterruptedException
> public interface MyClass extends AutoCloseable {
>        ^
> 1 warning
> 
> The warning is not useful because `AutoCloseable.close()` is abstract and so it's going to be some other class' job to deal with the throws clause.
> 
> This change prevents `AutoCloseable.close()` itself from triggering the warning in a class declaration. We preserve the existing behavior in which a warning is generated at the use site (i.e., at the try-with-resources statement).

This pull request has now been integrated.

Changeset: a5864582
Author:    Archie Cobbs <acobbs at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/a5864582da7e19b941bf55c294a414bc1a0c7a84
Stats:     306 lines in 6 files changed: 300 ins; 0 del; 6 mod

8155591: Misleading warning when not overriding close method in interface extending AutoCloseable

Reviewed-by: jlahoda

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PR: https://git.openjdk.org/jdk/pull/27062