What to do to make the minecraft server start with the specified memory?

Question

Java

I start the server via .bat, here is the command:
java -Xmx1G -Xms1G -jar server.jar nogui the
server does not start!
if I remove the memory and leave
java -jar server.jar nogui the
server will start, but the memory will be allocated 256m
Help!
By the way, if you turn on the server with a double click, everything works!