RFR: 8208752: Calling a deserialized Lambda might fail with ClassCastException [v4]

Thu Jan 22 16:38:15 UTC 2026

On Thu, 22 Jan 2026 16:30:03 GMT, Liam Miller-Cushon <cushon at openjdk.org> wrote:

> Thanks, I agree with not doing #29075 separately first to avoid a breakage. However doing this one first also doesn't work, this change by itself would regress `tools/javac/lambda/SerializableObjectMethods.java` and `tools/javac/lambda/LambdaLambdaSerialized.java`. Currently those tests rely on lambdas being incorrectly merged together, and with this fix they no longer get merged because they have different target types, but then they don't deserialize because the `getImplClass` doesn't match. Those test failures were what led me down the path of that other fix: https://bugs.openjdk.org/browse/JDK-8208752?focusedId=14636922&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-14636922
> 
> So I think maybe we should just merge both of these changes into a single fix? I will update the PR if that makes sense.

Ah, OK. Then I would say merge the patches - if they cannot be separated, then merging/combining them is the only real option.

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PR Comment: https://git.openjdk.org/jdk/pull/28943#issuecomment-3785380123