I have the JAVA_HOME variable set to the Temurin 21 JDK: /usr/lib/jvm/temurin-21-jdk-amd64. I expected that Gradle would do something sensible like use this as the ...

JAVA_HOME is an unnecessary variable, as this can be detected from the running java program. setting it causes subsequent errors, like the microsoft vscode java plugin thinks all of a sudden JAVA_HOME ...