Change Heap Size of JVM
The aim is to change heap size of JVM. Under the /usr/share/tomcat6/bin , there is a file name as catalina.sh. In the file you can write CATALINA_OPTS="-Xms256m -Xmx256m" at the 2nd line and then restart the tomcat. To do that, (I supposed that you have a root right. If not , type sudo -s ) First of all, go to the tomcat6 bin directory and stop it. ex. /etc/init.d/tomcat6 stop Then, change the right of the catalina.sh file as root. Here is; chown gunay /usr/share/tomcat6/bin/catalina.sh Important: I have used in ubuntu machine and tomcat6 is ubuntu's tomcat not a standalone version. At the end, you can change file rights as tomcat6 and then start the server. /etc/init.d/tomcat6 start