Setting JVM options for Tomcat * Windows running Tomcat 5 and later : Go to the "Apache Tomcat 5.0" folder in the Start Menu. Start the "Configure Tomcat application". Note: the configuration can only be started when Tomcat is not running. Select the "Java VM" tab in the configuration dialog. You will see some pre-defined lines in the "Java Options" test box. Append your Java options at the bottom of the option list. For example, to set server mode and allow 512MB of heap memory, append the following: -server -Xmx400m * Windows running Tomcat 4.1 or earlier : place the Java options into the CATALINA_OPTS environment variable. To do this, run Control Panel / System, select Environment Variables and create the CATALINA_OPTS variable, and set the desired option, for example "-server -Xmx400m". * Linux : place the Java options into the CATALINA_OPTS environment variable. For example: "-server -Xmx400m". THANKS TO MARK :)