Upgrade from 7.9.6 to 8.9.3 LTS

Upgrade from 7.9.6 to 8.9.3 LTS. I have downloaded zip file and configured all the DB things, While start sonar service. Getting issue in Elasticsearch.“Error: Could not find or load main class 8-13:-XX:+UseConcMarkSweepGC Caused by: java.lang.ClassNotFoundException: 8-13:-XX:+UseConcMarkSweepGC”

Java version - 11
OS : ubuntu 18.04.1
Postgresql - 10.19


Welcome to the community!

Could you share more of that log? Specifically, a few lines leading up to that error and the full stacktrace.