git: openjdk/jdk21u-dev: master: 8340554: Improve MessageFormat readObject checks

[Goetz Lindenmaier]

Changeset: ab291f5f
Branch: master
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2025-07-18 19:43:38 +0000
URL:       https://git.openjdk.org/jdk21u-dev/commit/ab291f5ffcbc46429a61fb7f8351c95bb419b20e

8340554: Improve MessageFormat readObject checks

Backport-of: 7af46a6b424cadfe298958d774da0f21db58ecd3

! src/java.base/share/classes/java/text/MessageFormat.java
! test/jdk/java/text/Format/MessageFormat/SerializationTest.java