Integrated: 8277585: Remove the terminally deprecated finalize() method from javax.imageio.stream APIs

[Phil Race]

On Tue, 5 Aug 2025 21:17:36 GMT, Phil Race <prr at openjdk.org> wrote:

> This PR removes javax/imageio/stream/ImageInputStreamImpl.finalize()
> As a result, sub-classes which over-ride it to be empty no longer need to do so.
> Also it means that the 2 remaining classes which used it no longer can.
> FileCacheImageOutputStream will have its cache cleaned up by a disposer.
> The impact on applications is that they, or the ImageWriter may need to call flush() IF they relied on finalization.
> However that should be extremely unlikely given that finalization will happen far too late in most cases, and is
> really meant to clean up internal resources.
> The JDK's GIF and TIFF image writers don't flush themselves, so applications which use these together with one of these caching streams would have learned this already.
> 
> The principal outside risk is to 3rd party ImageIO stream subclasses which both allocate native resources and rely on finalization as a backstop clean up in case applications forget to call close. But it will be the applications that are affected if the resource is depleted. 
> The risks of this will be covered in the CSR.
> 
> There's also a lengthy write up in the JBS issue.

This pull request has now been integrated.

Changeset: 0858743d
Author:    Phil Race <prr at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/0858743deed6b4fa2329983c7911d9f56f875b8e
Stats:     251 lines in 10 files changed: 37 ins; 203 del; 11 mod

8277585: Remove the terminally deprecated finalize() method from javax.imageio.stream APIs

Reviewed-by: achung, azvegint, serb

-------------

PR: https://git.openjdk.org/jdk/pull/26650