mvn package fails with a class file version error.

[mansu]

If mvn package command fails with a class file version error

[ERROR] Failed to execute goal com.spotify.fmt:fmt-maven-plugin:2.21.1:format (default) on project kaldb: Execution default of goal com.spotify.fmt:fmt-maven-plugin:2.21.1:format failed: Unable to load the mojo 'format' in the plugin 'com.spotify.fmt:fmt-maven-plugin:2.21.1' due to an API incompatibility: org.codehaus.plexus.component.repository.exception.ComponentLookupException: com/spotify/fmt/FMT 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

[mansu]

This error happens when the Java version is older than java 9. Can be fixed by using the latest version of JVM.

To fix this we need to set the Java version to Java 21:

export JAVA_HOME=/usr/libexec/java_home -v 1.8

More instructions for mac can he found here.