Install Java Open JDK 8 on CentOS 7


This is the installation procedure for OpenJDK8.


Install OpenJDK8

$ sudo yum -y install java-1.8.0-openjdk java-1.8.0-openjdk-devel 

Confirm path

$ dirname $(readlink $(readlink $(which java)))

Setting environment variables

Set the following as environment variables somewhere.

JAVA_HOME sets the part before / jre / bin of the above path confirmation.

$ sudo vi /etc/profile

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/jre/lib:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jar 
$ source /etc/profile

The above example sets environment variables in / etc / profile, Please refer to the following when setting in other locations.

Set default JDK

Change the default if another version of the JDK is already installed. In the example below, only one is included.

$ sudo alternatives --config java

There is 1 program that provides 'java'.

  Selection    Command
*+ 1           java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-

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

Operation check

Create the following program to check the operation.

import java.util.Calendar;

class day {
    public static void main(String[] args) {
        Calendar cal = Calendar.getInstance();
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH) + 1;
        int day = cal.get(Calendar.DATE);
        int hour = cal.get(Calendar.HOUR_OF_DAY);
        int minute = cal.get(Calendar.MINUTE);
        System.out.println(year + "/" + month + "/" + day + " " + hour + ":" + minute);


$ javac


Success if the current date and time is displayed

$ java day
2017/10/12 4:27


-OpenJDK 8 installation

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