1) sudo vi /etc/bash.bashrc
2)
#java env setup
export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk
export JRE_HOME=/usr/lib/jvm/java-1.6.0-openjdk/jre
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=./:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
3)source /etc/bash.bashrc
from: http://hi.baidu.com/liwei_8/blog/item/851cda6087f86ad28db10def.html
