for Red hat ( and the older 5.4 ) it is assumed that one KNOWS what they are doing
are paying for the support from Red Hat a 1 year RHEL server contract is $1299 US ( home desktop is $299)
also Oracle JDK ( not sun) is no longer used, OpenJDK is.
Oracle is closing up there java
for red hat support you might want to read the red hat site and buy a license ( besides the $49US home self support ).
however CentOS 6.0 and ScientificLinux 6.1 are free rebuilds of RHEL6.1