Install JDK 7

http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

# cd /usr/local/src
# wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.rpm"

# rpm -ivh jdk-7u79-linux-x64.rpm
# vi /etc/profile
~~~~~
export JAVA_HOME=/usr/java/default
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/jre/lib:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jar

# source /etc/profile
# alternatives --config java
There is 1 program that provides 'java'.

  Selection    Command
-----------------------------------------------
*+ 1               /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.91-2.6.2.3.el7.x86_64/jre/bin/java

Enter to keep the current selection[+], or type selection number: 1

# java -version

java version "1.7.0_91"

OpenJDK Runtime Environment (rhel-2.6.2.3.el7-x86_64 u91-b00)

OpenJDK 64-Bit Server VM (build 24.91-b01, mixed mode)