Install Java 6 on CentOS 5.2

1. run /usr/sbin/alternatives --config java, it gives no response.
2. run uname -m and it gives i386. it means it is a linux not a linux64.
   
3. download jdk rpm from java.sun.com, at the time, sun provides JDK 6 Update 12. select the Linux and the rpm.bin
4. chmod of the bin file and make it executable, run it
   
5. Get error -bash: ./jdk-6u12-linux-i586-rpm.bin: /bin/sh: bad interpreter: Permission denied
6. after some research, i realized that the /tmp is shared managed. it won't allow me to run any scripts there. so i moved the bin file to my home directory and run it, it installed the java automatically
   
7. run rpm -qa | grep java and got jdk-1.6.0_12-fcs, run rpm -qa | grep sun also returns a bunch of packages
8. run /usr/sbin/alternatives --config java, it still gives no response but run java -version, it gives the 1.6.0_12 back.
9. done.