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[Doc] Update Readme to specify Java 11 for sbt build - #5377
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Thanks for updating the instructions!
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The Building section already states that Java 17 or newer is required (delta-io#6211), but the "Running python tests locally", "IntelliJ Setup" and "Troubleshooting" sections still instruct contributors to use JDK 11. Those instructions date back to delta-io#5377, before cross-Spark-version support (delta-io#5418) moved the build to JDK 17. JDK 17 is what the build actually requires today: every supported Spark version in project/CrossSparkVersions.scala declares targetJvm = "17", and the CI workflows install Java 17 for the Spark, Python, Iceberg, Flink and unidoc jobs. This only touches the contributor-facing setup instructions. The JVM 11 bytecode target in build.sbt and the deliberate JDK 11 runs in kernel_test.yaml / kernel_docs.yaml, which verify that Kernel artifacts stay runnable on JVM 11, are left unchanged. Signed-off-by: genius.choi <csj4032@gmail.com>
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Which Delta project/connector is this regarding?
Description
Update readme to specify Java 11 for sbt build, which is needed after Iceberg dependency upgrade.
How was this patch tested?
Verified locally. With Java 1.8, sbt compilation fails.
Does this PR introduce any user-facing changes?
No, README update for developers.