RFR: 6323374: (coll) Optimize Collections.unmodifiable* and synchronized* [v4]

Tue Feb 23 23:34:39 UTC 2021

On Tue, 23 Feb 2021 16:27:06 GMT, Ian Graves <igraves at openjdk.org> wrote:

> Is there any behavior change here that merits a CSR review?

Yes. See my comments in the bug report:

https://bugs.openjdk.java.net/browse/JDK-6323374?focusedCommentId=14296330&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14296330

There is not only the issue of the identity of the object returned, but the change is also observable in the serialized form. Most people would consider the change (less nesting) to be an improvement, but the change is observable, and as we know any observable behavior can become depended upon by applications.

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PR: https://git.openjdk.java.net/jdk/pull/2596