CentOS 6, JDK 8 설치하기

$ cd /opt/
$ 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/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-x64.tar.gz"
$ tar xzf jdk-8u131-linux-x64.tar.gz

$ cd /opt/jdk1.8.0_131
$ alternatives --install /usr/bin/java java /opt/jdk1.8.0_131/bin/java 2
$ alternatives --config java

$ java -version
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)

$ nano /etc/environment
export JAVA_HOME=/opt/jdk1.8.0_131
export JRE_HOME=/opt/jdk1.8.0_131/jre