Hi! I have Spring Boot Java application that i have been running with default settings

I found that memory usage is too big - I switched from Tomcat to Undertow and tried to use the run command as next:
java -Xms300m -Xmx1000m -jar -Dserver.port=$PORT $(ls -1 build/libs/*jar | grep -v plain)

It won't helped much I still see this strange memory usage picture: Seems like I dig the wrong hole. I don't use any custom docker files and to be honest I'm not an expert in Nixpacks.

Is there anyone who optimized Java app memory?