Java HotSpot ™ 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated

It may be a JDK version problem

jdk1.8 is OK
if you want to use a higher version, such as jdk11

Windows:
Modify bin\runserver.cmd
Linux:
Modify bin\runserver.sh
before modification:

set "JAVA_OPT=%JAVA_OPT% -XX:+UseConcMarkSweepGC -XX:+UseCMSCompactAtFullCollection -XX:CMSInitiatingOccupancyFraction=70 -XX:+CMSParallelRemarkEnabled -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+CMSClassUnloadingEnabled -XX:SurvivorRatio=8 -XX:-UseParNewGC"

After modification:

set "JAVA_OPT=%JAVA_OPT%  -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+CMSClassUnloadingEnabled -XX:SurvivorRatio=8"