Tag Archive: Ubuntu


Here’s a helpful overview of the primary differences between Ubuntu and CentOS:

http://ubuntuforums.org/showthread.php?t=824305

https://help.ubuntu.com/community/SwitchingToUbuntu/FromLinux/RedHatEnterpriseLinuxAndFedora

The apt repository only includes JDK version 6 or version 5.16. Versions of 5 prior to update 17 have a known security vulnerability, so you may want to use 5.18 instead. However, this requires a manual install. From Java-free install of Ubuntu/Debian, follow the instructions here, taking careful note of logging in as the different uses (e.g., follow the instructions explicitly): http://www.debianhelp.co.uk/debianjava.htm.

After this, you’ll need to set the JAVA_HOME variable and include it in your path. Include the following lines at the end of /etc/profile and /etc/bash.bashrc (see the explanation of Debian/Ubuntu environment variables here: https://help.ubuntu.com/community/EnvironmentVariables#System-wide):

export JAVA_OPTS="-server -Xms768m -Xmx768m -XX:PermSize=128m -XX:MaxPermSize=256m -XX:NewSize=192m -XX:MaxNewSize=384m"
export JAVA_HOME="/usr/bin/java"
export JDK_HOME="${JAVA_HOME}"
export PATH="${JAVA_HOME}/bin:${PATH}"