Java

Our default Java installation is version 1.5.0_06 from Sun.

Example Session

$ cat Main.java 
import java.io.*;
import java.lang.*;
public class Main {
  public static void main(String args[]) throws
         Exception {
    System.out.println("hello\n");
  }
}
$ javac Main.java 
$ java Main
hello
$

We also provide Java 1.4.2_10 from sun, but if you want to use that rather than the default, you need to do some special configuration:

$ JAVA_HOME=/opt/java2/j2sdk1.4.2_10; export JAVA_HOME
$ PATH=$JAVA_HOME/bin:$PATH; export PATH
$ which javac
/opt/java2/j2sdk1.4.2_10/bin/javac
$ which java
/opt/java2/j2sdk1.4.2_10/bin/java

You can then put those environment variable settings in your shell init files so they stick. For example, if your shell is bash, you can put those commands in ~/.bashrc and ~/.bash_profile.