Java 8 Installation In Linux

Step 1 – Download Latest Java Archive

Download latest Java SE Development Kit 8 release from (http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html) download page or use following commands to download from shell.

[root@sn02 java]# cd /opt/

[root@sn02 java]# 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/8u151-b12/e758a0de34e24606bca991d704f6dcbf/jdk-8u151-linux-x64.tar.gz"

[root@sn02 java]# tar xzf jdk-8u151-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.

[root@sn02 java]# cd jdk1.8.0_91

[root@sn02 jdk1.8.0_91]# alternatives --install /usr/bin/java java /opt/jdk1.8.0_91/bin/java 2

[root@sn02 jdk1.8.0_91]# alternatives --config java

There are 4 programs which provide 'java'.

  Selection    Command

-----------------------------------------------

 + 1           /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java

    2           /opt/java/jdk1.8.0_45/bin/java

*  3           /usr/lib/jvm/jre-1.8.0-openjdk.x86_64/bin/java

    4           /opt/jdk1.8.0_91/bin/java

Enter to keep the current selection[+], or type selection number: 4

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

[root@sn02 jdk1.8.0_91]# alternatives --install /usr/bin/jar jar /opt/jdk1.8.0_91/bin/jar 2

[root@sn02 jdk1.8.0_91]# alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_91/bin/javac 2

[root@sn02 jdk1.8.0_91]# alternatives --set jar /opt/jdk1.8.0_91/bin/jar

[root@sn02 jdk1.8.0_91]# alternatives --set javac /opt/jdk1.8.0_91/bin/javac

Step 3 – Check Installed Java Version

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

[root@sn02 jvm]# java -version

java version "1.8.0_91"

Java(TM) SE Runtime Environment (build 1.8.0_91-b14)

Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, 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

Step 4: Setup JAVA_HOME, JRE_HOME and PATH environment variables

Use bellow the command for this.

export JAVA_HOME=/opt/jdk1.8.0_151

export JRE_HOME=/opt/jdk1.8.0_151/jre

export PATH=$PATH:/opt/jdk1.8.0_151/bin:/opt/jdk1.8.0_151/jre/bin

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