This small guide shows how to install the original Sun Java 2 Platform Standard Edition 5.0 JRE (Java Runtime Environment) and JDK (Java Developer Kit) on Debian 4.0 Etch
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The original Sun Java 2 is available in the ‘non-free’ section of the Debianrepositories. To enable this section first add the non-free repository to the apt sources file – the /etc/apt/sources.list should look like, – important parts are in bold:
deb http://ftp.us.debian.org/debian/ etch main contrib non-free
Now, update apt:
sudo apt-get update
Then install the Java debian packages.
sudo apt-get install sun-java5-jre
Or this for installing the JDK ( the Java SDK )
sudo apt-get install sun-java5-jdk