How to install JDK 8 on CentOS

How to install JDK 8 on CentOS

In this tutorial, you will see how to install Oracle JDK 8 On CentOS.

 

1. Get Oracle JDK 8

1.1 Visit Oracle JDK download page, look for RPM version.

1.2 Copy the download link of jdk-8u102-linux-x64.rpm and wget it.

$ pwd /home/mkyong $ wget --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u102-b14/jdk-8u102-linux-x64.rpm

2. Install Oracle JDK 8

2.1 Install with yum localinstall.

$ sudo yum localinstall jdk-8u102-linux-x64.rpm //... //... //... Installed: jdk1.8.0_102.x86_64 2000:1.8.0_102-fcs Complete!

2.2 Now the JDK should be installed at /usr/java/jdk1.8.0_102

$ cd /usr/java $ ls -lsah total 12K 4.0K drwxr-xr-x 3 root root 4.0K Jul 21 09:58 ./ 4.0K drwxr-xr-x. 15 root root 4.0K Jun 22 22:00 ../ 0 lrwxrwxrwx 1 root root 16 Jul 21 09:58 default -> /usr/java/latest/ 4.0K drwxr-xr-x 9 root root 4.0K Jul 21 09:58 jdk1.8.0_102/ 0 lrwxrwxrwx 1 root root 22 Jul 21 09:58 latest -> /usr/java/jdk1.8.0_102/

2.3 Verification

$ java -version java version "1.8.0_102" Java(TM) SE Runtime Environment (build 1.8.0_102-b14) Java HotSpot(TM) 64-Bit Server VM (build 25.102-b14, mixed mode)

2.4 Delete the RPM file

$ rm ~/jdk-8u102-linux-x64.rpm

Done. Oracle JDK 8 is installed on CentOS successfully.

3. JAVA_HOME Environment Variables

This is good practice to set the JAVA_HOME environment variable.

3.1 Edit the .bash_profile, and append the export JAVA_HOME at the end of the file, for example :

.bash_profile

# Get the aliases and functions if [ -f ~/.bashrc ]; then . ~/.bashrc fi # User specific environment and startup programs export JAVA_HOME=/usr/java/jdk1.8.0_102/ export JRE_HOME=/usr/java/jdk1.8.0_102/jre PATH=$PATH:$HOME/bin:$JAVA_HOME/bin export PATH

3.2 Test the $JAVA_HOME and $PATH

$ source .bash_profile $ echo $JRE_HOME /usr/java/jdk1.8.0_102/jre $ echo $JAVA_HOME /usr/java/jdk1.8.0_102/ $ echo $PATH /...:/usr/local/bin:/usr/X11R6/bin:/home/mkyong/bin:/usr/java/jdk1.8.0_102//bin

4. Multiple JDK installed

If the CentOS has multiple JDK installed, you can use the alternatives command to set the default java

$ sudo alternatives --config java [sudo] password for mkyong: There are 2 programs which provide 'java'. Selection Command ----------------------------------------------- 1 /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java *+ 2 /usr/java/jdk1.8.0_102/jre/bin/java

Note :This guide should work on Fedora & RedHat.

Reference: mkyong

 

 

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