I was messing around with screen-cast software today and found that I needed to sort out both the Java Run-time Environment and Java Plugins for Firefox and Chrome on my Ubuntu machine.
This http://askubuntu.com/questions/48468/how-do-i-install-java was very useful.
Basically just run the following in Terminal and you’re good to go:
sudo apt-get install icedtea-plugin
sudo update-alternatives --config java
sudo apt-get install openjdk-6-jreThen go to - http://www.java.com/en/download/testjava.jsp to verify that it's working. Worked for me anyway.