Install Java 1.8 on CentOS

Install Java 1.8 on CentOS

Elasticsearch requires jdk 7 and later, and Oracle JDK version 1.8.0 _ 25 is recommended. This article describes how to install java 1.8 on CentOS.

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First, update the installed package:

yum update

View the current java version of the system:

java -version

If an old version is found, you can further query the installed JDK:

rpm -qa | grep -E '^(java|jdk)'

Rpm-qa indicates to query all installed packages. grep-E '^ (java | jdk)' uses a regular expression to filter the output results starting with java or jdk, the output may be like this:

Java-1.6.0-openjdk-1.6.0.37-1.13.9.4.el6_7.x86_64

Java-1.6.0-openjdk-devel-1.6.0.37-1.13.9.4.el6_7.x86_64

Run the following command to delete the old jdk:

yum remove java-1.6.0-openjdk

Download jdk from the official oracle Website:

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/8u65-b17/jdk-8u65-linux-x64.rpm"

After the new version, you need to add a cookie header to the download page to use wget for smooth download. You can select the version number on the official website.

Installation:

rpm -ivh jdk-8u65-linux-x64.rpm

After installation, confirm the default java version of the current system again:

If you see:

Java version "1.8.0 _ 65"

Java (TM) SE Runtime Environment (build 1.8.0 _ 65-b17)

Java HotSpot (TM) 64-Bit Server VM (build 25.65-b01, mixed mode)

Congratulations! The installation is successful.

Make sure that the environment variables are correct during each initialization:

vim/etc/profile.d/java.sh

Input:

#!/bin/bashJAVA_HOME=/usr/java/jdk1.8.0_65/PATH=$JAVA_HOME:$PATHexport PATH JAVA_HOME

After saving and exiting, add the executable permission for the script:

chmod 744 /etc/profile.d/java.sh

Finally, execute the script to make the environment variable settings take effect:

source /etc/profile.d/java.sh

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