i made it like this replaces all 1024 to 2048
REM Default parameters for a basic server.
java -Dfile.encoding=UTF-8 -Xmx2048m -cp bsf.jar;bsh-engine.jar;bsh-2.0b5.jar;mmocore.jar;javolution.jar;c3p0-0.9.1.2.jar;mysql-connector-java-5.1.6-bin.jar;l2jteon.jar;jython.jar;jython-engine.jar;commons-logging-1.1.jar;java-engine.jar net.sf.l2j.gameserver.GameServer
REM
REM If you have a big server and lots of memory, you could experiment for example with
REM java -server -Xmx2048m -Xms2048m -Xmn2024m -XX:PermSize=256m -XX:SurvivorRatio=8 -Xnoclassgc -XX:+AggressiveOpts
this error appears:
Could not resolve enough space for object heap
Could not create java virtual machine
P.s i have 3 gb ram.