Configure Java RTE in CentOS

Two ways to configure Java runtime environment in CentOS.

Update the software package 

Make sure the server software package is updated.

sudo yum update -y

Method 1

Install OpenJRE.

sudo yum install java-1.8.0-openjdk -y

Check whether it is installed.

java -version

Method 2

Download JDK from Oracle website, and unzip it to /usr/local/java/jdk1.8.0_241. You need to sign up to download, and it is free.

Open the file.

vim /etc/profile

Add the code below to the end of the file.

export JAVA_HOME=/usr/local/java/jdk1.8.0_241
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

Make it work.

source /etc/profile

Add a soft link.

ln -s ${JAVA_HOME}/bin/java /usr/bin/java

Check whether it is installed.

java -version