Embedded Tomcat Would Not Start

I got this error when I run Jhipster project on Jrebel. I try to increase my java heap size until to 512m by insert this line to VM Argument on Arguments Tab, but can not solve the error. I want to ask what the cause of error and how to solve it?

${jrebel_args}

-Xms512m -Xmx1024m

[ERROR] org.springframework.boot.context.embedded.tomcat.ServletContextInitializerLifecycleListener - Error starting Tomcat context: org.springframework.beans.factory.BeanCreationException
Exception in thread "main" 
Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "main"
Exception in thread "process reaper" Exception in thread "process reaper"