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Since our branch can't be used to build/deploy flink most of the changes just exclude parts of the project.
There were a few problems - dependencies that no longer exist on maven central, sun-jdk specific code etc. Some modules just got commented out, a few tests just deleted to not deal with figuring out what's wrong there.
With changes in project settings (jdk 11 + set output path), plus unchecked "use release" for java compiler, activated profile "java11-target", and these changes I was able to build the project in intellij
mvn clean install -Drat.skip=true -Dcheckstyle.skip=true -DskipTests -P java11-target
worked from cli tooContext: https://datastax.slack.com/archives/C04U1EMNTU3/p1685666444798889?thread_ts=1685647168.573669&cid=C04U1EMNTU3