Install Java with yum under RHEL/CentOS 7

The software installation methods of each Linux distribution are different. For example, Java, the installation under RedHat / CentOS adopts its own unique method.

Of course, the easiest way is to use yum to install.

Check the java version in the yum repository

At the command line, directly enter the following command to see which Java installation versions are available in the yum software repository.

yum search java | grep jdk

As you can see, under CentOS 7, there are versions of Java 1.6/1.7/1.8 available for installation.

select install

I want to install Java 1.8 here, so install it like this (install the runtime environment and development environment):

yum install java-1.8.0-openjdk java-1.8.0-openjdk-devel

set variable environment

Edit the environment configuration file /etc/profile:

vi /etc/profile

Add the following at the end:

#set java environment 
JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-0.b14.el7_4.x86_64 
JRE_HOME=$JAVA_HOME/jre 
CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib 
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin 
export JAVA_HOME JRE_HOME CLASS_PATH PATH 

Then let the environment configuration take effect:

source /etc/profile

Verify the validity of the JDK

java -version