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Update Java to 21 and Kafka + Hazelcast to latest versions#4

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SoerenHenning wants to merge 2 commits intomainfrom
upgrade-java-kstreams-hzcast
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Update Java to 21 and Kafka + Hazelcast to latest versions#4
SoerenHenning wants to merge 2 commits intomainfrom
upgrade-java-kstreams-hzcast

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@SoerenHenning SoerenHenning commented Apr 20, 2026

  • Most subprojects are upgraded to Java 21, except:
  • The Common, Flink and Spark projects remain at Java 11 for now (to be upgraded in a follow up PR)
  • Kafka Streams is upgraded to 4.2
  • Hazelcast to 5.5
  • Kafka clients in the util projects are upgraded to 4.2

…t Kafka clients, Kafka Streams and Hazelcast
@SoerenHenning SoerenHenning marked this pull request as draft April 20, 2026 12:41
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