Why does Oracle java not appear in the alternatives command on redhat 6.5?

I have redhat 6.5 x64 and java preinstalled on it. The command java - version shows:

java version "1.7.0_45"OpenJDK Runtime Environment (rhel-2.4.3.3.el6-x86_64 u45-b15)OpenJDK 64-Bit Server VM (build 24.45-b08, mixed mode)

The command /usr/sbin/alternatives --config java shows:

There are 2 programs which provide 'java'.  Selection    Command-----------------------------------------------*+ 1           /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java   2           /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java

I need to install Oracle java 7.0_21. So I run a command yum install jdk-7u21-linux-x64.rpm and get at the end:

Installed:  jdk.x86_64 2000:1.7.0_21-fcsComplete!

So then I run again /usr/sbin/alternatives --config java shows: and it shows the same as before Oracle java installation.

Why just installed java from Orcale is not in the list?

P.S.

This answer tells that --config does not work with bin packages but I run yum install jdk-7u21-linux-x64.rpm so it is not the same case. Is it?