A million ways to change HEAP memory in Java

memory.md

Xmx vs Xms

Remember, Xmx corresponds to max heap and Xms corresponds to starting heap. It can be an optimization to set these equal.

In Spring Boot build.gradle

bootRun {
      jvmArgs = ['-Xmx1g']
}

java app from command line

java -Xmx512m -Dspring.profiles.active=dev -jar app.jar

From maven

mvn spring-boot:run -Drun.jvmArguments="-Xmx512m" -Drun.profiles=dev

From ENV variable:

export JAVA_OPTS="-Xmx1024m -Xms256m"