Howto Install Open JDK 1.8 on CentOS 7 ?

Just follow the steps below.

# yum update -y

# yum install java-1.8.0-openjdk -y

Set Class Path as below.

# echo "JAVA_HOME=/usr/bin" >> /root/.bash_profile
# echo "export JAVA_HOME" >> /root/.bash_profile

# JAVA_HOME=/usr/bin
# export JAVA_HOME

Done !