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java.lang.UnsupportedClassVersionError: org/eclipse/jdt/internal/compiler/env/INameEnvironment has been compiled by a more recent version…

• Seems I originally installed tomcat9 via apt, but it seems like I hit a known bug (

  • https://bugs.launchpad.net/ubuntu/+source/tomcat9/+bug/1972829

  • https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1006647

• The workaround in the first link didn’t work for me… So I re-traced my steps

  • (undoing the workaround)

    • sudo apt remove libecj-java

    • sudo unlink /var/lib/tomcat9/lib/ecj.jar

  • (undoing our other another workaround for Smart Tomcat, if you used apt)

    • sudo unlink /usr/share/tomcat9/conf

  • (removing tomcat via apt)

    • sudo apt purge tomcat9 tomcat9-admin (purge removes config files too)

  • (remove user and group automatically added by apt)

    • sudo userdel tomcat

    • sudo groupdel tomcat