I found for Tomcat on Windows, the following worked.

If the Tomcat AppServer is configured as a Windows Service, you need to run the tomcatw.exe command and then enter the values in the fields as per below:

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Restart Tomcat and check the Catalina log. You should see something like this:

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If the Tomcat AppServer is NOT configured as a Windows Service, you need to create file setenv.bat in the Tomcat bin folder and add the following entries:

set JAVA_OPTS=%JAVA_OPTS% -Dfile.encoding=UTF-8 -server -Xms512m -Xmx2g -Xss4m

You should see something like this in the catalina.log

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