Package of zabbix-java-gateway v7.0.9 is defective.

For rhel8 it uses java-1.8.0-openjdk-headless as dependency but refuses to start using that java version:
Exception in thread "main" java.lang.UnsupportedClassVersionError: ch/qos/logback/classic/spi/LogbackServiceProvider has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0

I installed java 21 and set alternatives to the new version, then the java gateway starts. Removal of java 1.8.0 is not possible since it is set as a dependency.