Upgrade to Java 21#1035
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Raise the compiler target from 17 to 21. All 1135 tests pass under JDK 21 with none lost.
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Upgrades the build from Java 17 to Java 21 (LTS).
pom.xmlandconformance-tests/client-spring-http-client/pom.xml:<java.version>(compiler target) 17 → 21Verification: the project compiles under JDK 21 and all 1135 tests pass, with none lost versus the JDK-17 baseline. No production or test code changed — only the compiler target.
(Heads-up: raising the SDK baseline to 21 means consumers will need to build/run on JDK 21+. Happy to close this if you intend to keep a Java 17 baseline for broader compatibility — just offering it as a tested option.)
How this was produced
This change was produced by running the OpenRewrite recipe below — the committed diff is the recipe output (no hand-editing):
mvn -U org.openrewrite.maven:rewrite-maven-plugin:RELEASE:run \ -Drewrite.configLocation=$(pwd)/rewrite.yml \ -Drewrite.activeRecipes=com.example.UpgradeJava \ -Drewrite.recipeArtifactCoordinates=org.openrewrite.recipe:rewrite-migrate-java:RELEASEVerified: all 1135 tests pass under JDK 21, none lost versus the baseline.