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Setting up JAVA environment on Ubuntu10.04 (2011-11-23)

Correct java version

Check your java version with:

java -version

If it is not correct, you need to set the "alternatives" correctly:

sudo update-alternatives --list java
sudo update-alternatives --set java /usr/lib/jvm/java-6-sun/jre/bin/java
sudo update-alternatives --set javac /usr/lib/jvm/java-6-sun/bin/javac
sudo update-alternatives --set javaws /usr/lib/jvm/java-6-sun/jre/bin/javaws

Additions to environment file

Add the following to $HOME/.bashrc:

export JDK_HOME=/usr/lib/jvm/java-6-sun/
export JAVA_HOME=$JDK_HOME
export  MAVEN_OPTS="-Xms256m -Xmx712m -XX:PermSize=128m -XX:MaxPermSize=256m  -XX:NewSize=64m -XX:MaxNewSize=128m -Dfile.encoding=UTF-8 -Denv=dev"

After the change, do:
source $HOME/.bashrc