We need to set JAVA_HOME a lot of times in linux. Here is the procedure for setting JAVA_HOME in linux (i tested this only on Ubuntu, but i think, it should work in all linux distributions).
To Set JAVA_HOME:
Step 1: Open Terminal
Step2: as sudo, open /etc/bash.bashrc file (sudo gives administrative privilege to user in Ubuntu, for other linux distributions type su then hit enter, it will ask for root password, enter the password and then open /etc/bash.bashrc file)
Step3: add following lines at the end of the file:
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JAVA_HOME=/usr/lib/jvm/java
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export JAVA_HOME
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PATH=$PATH:$JAVA_HOME/bin
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export PATH
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Step4: Reboot the computer.
For checking, if JAVA_HOME is set or not, in terminal type:
echo $JAVA_HOME and hit enter, if you get: /usr/lib/jvm/java or /usr/lib/jvm/java* (java* means something after java) then you have set JAVA_HOME correctly and if you get nothing (blank line) or something else, then there is some problem with JAVA_HOME environment setting.
http://tarunsays.wordpress.com/2010/01/30/setting-java_home-in-linux/