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Using Java 21 as the runtime allows chaincode developers to exploit newer Java features, and provides JVM performance improvements. Java 11 is no longer supported by RedHat and public support from other vendors ends in 2027.
I aim to (and have tested) fabric-chaincode-java with Java 21, so this change will match the forthcoming target Java runtime for the chaincode container. Chaincode written for Java 11 and later is still fully supported. The only caveat is that Java chaincode that package a Gradle wrapper with the chaincode must now use Gradle 8.5 or later, since that Gradle version added support for execution with Java 21. Gradle 8.5 was released in November 2023.