How to Install JAVA 8 on CentOS/RHEL 7/6 and Fedora 26/25

Posted by Blog Admin at Monday, September 25, 2017 . 9/25/17
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This article will help you to Install JAVA 8 (JDK/JRE 8u144) or update on your system. Read the instruction carefully before downloading Java from Linux command line.

Step 1 – Download Latest Java Archive


Download latest Java SE Development Kit 8 release from its official download page or use following commands to download from shell.

# 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/8u144-b01/090f390dda5b47b9b721c7dfaa008135/jdk-8u144-linux-x64.tar.gz"

# tar xzf jdk-8u144-linux-x64.tar.gz


Step 2 – Install Java 8 with Alternatives


After extracting archive file use alternatives command to install it. alternatives command is available in chkconfig package.

# cd /opt/jdk1.8.0_144/
# alternatives --install /usr/bin/java java /opt/jdk1.8.0_144/bin/java 2
# alternatives --config java


There are 3 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*  1           /opt/jdk1.7.0_71/bin/java
 + 2           /opt/jdk1.8.0_45/bin/java
    3           /opt/jdk1.8.0_144/bin/java

Enter to keep the current selection[+], or type selection number: 3

At this point JAVA 8 has been successfully installed on your system. We also recommend to setup javac and jar commands path using alternatives

# alternatives --install /usr/bin/jar jar /opt/jdk1.8.0_144/bin/jar 2
# alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_144/bin/javac 2
# alternatives --set jar /opt/jdk1.8.0_144/bin/jar
# alternatives --set javac /opt/jdk1.8.0_144/bin/javac


Step 3 – Check Installed Java Version


Check the installed Java version on your system using following command.

root@tecadmin ~# java -version

java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)


Step 4 – Setup Java Environment Variables


Most of Java based application’s uses environment variables to work. Set the Java environment variables using following commands

Setup JAVA_HOME Variable

export JAVA_HOME=/opt/jdk1.8.0_144

Setup JRE_HOME Variable
export JRE_HOME=/opt/jdk1.8.0_144/jre

Setup PATH Variable
export PATH=$PATH:/opt/jdk1.8.0_144/bin:/opt/jdk1.8.0_144/jre/bin

Also put all above environment variables in /etc/profile file for auto loading on system boot.