Once I establish which java to download, where should I download it?
./usr/share/java
./usr/bin/java
./usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre/bin/java (NOT HERE)
./usr/lib/java
./etc/alternatives/java (NOT HERE)
./etc/java
./var/lib/alternatives/java (NOT HERE)
That depends on your Linux setup, if your distro uses the RPM install system just issue “rpm -i javawhatever.rpm” and that should take care of almost everything.
If you are using some other install system or less common distro google for a java install howto, you will need help to configure the JAVAHOME shell variable yourself after install.