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

Liam Miller-Cushon cushon at openjdk.org
Thu Jan 22 11:45:08 UTC 2026


> See [JDK-8208752: Calling a deserialized Lambda might fail with ClassCastException](https://bugs.openjdk.org/browse/JDK-8208752).
> 
> Lambda deserialization currently does not consider `SerializedLambda#getInstantiatedMethodType` when deserializing lambdas, which can lead to method references that differ only in `getInstantiatedMethodType` being merged into the same lambda instance, and can result in `ClassCastException`s like the one reported in the bug.
> 
> This depends on the fix for [JDK-8374654: Inconsistent handling of lambda deserialization for Object method references on interfaces](https://bugs.openjdk.org/browse/JDK-8374654) in https://github.com/openjdk/jdk/pull/29075.

Liam Miller-Cushon has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains nine commits:

 - Merge branch 'JDK-8374654' into JDK-8208752
 - Test cleanup
 - Updates for --debug=dumpLambdaDeserializationStats
 - Merge branch 'JDK-8374654' into JDK-8208752
 - Merge branch 'JDK-8374654' into JDK-8208752
 - Update test
 - Merge branch 'JDK-8374654' into JDK-8208752
 - Don't rely on the iteration order of Map.of entries
 - 8208752: Calling a deserialized Lambda might fail with ClassCastException

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

Changes: https://git.openjdk.org/jdk/pull/28943/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28943&range=03
  Stats: 123 lines in 7 files changed: 97 ins; 6 del; 20 mod
  Patch: https://git.openjdk.org/jdk/pull/28943.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28943/head:pull/28943

PR: https://git.openjdk.org/jdk/pull/28943


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