In this tutorial, we will show you how to install and configuration of Oracle JDK 9 on your CentOS 7. There are many programs and scripts that require java to run it, but usually, Java is not installed by default on VPS or Dedicated Server.
This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo’ to the commands to get root privileges. I will show you through the step by step installation Oracle JDK 9 on a CentOS 7 server.
Install Oracle JDK 9 on CentOS 7
Step 1. First, remove the Java 1.6 or 1.7 have been installed already, you can uninstall them using the following commands.
yum remove java-1.6.0-openjdk yum remove java-1.7.0-openjdk
Step 2. Downloading and Installing Oracle JDK 9 on CentOS 7.
First, go to Java 9 official website of Oracle, select the appropriate version and then download:
wget --no-cookies --no-check-certificate --header "Cookie: oraclelicense=accept-securebackup-cookie" \ http://download.oracle.com/otn-pub/java/jdk/9.0.4+11/c2514751926b4512b076cc82f959763f/jdk-9.0.4_linux-x64_bin.tar.gz
Next, change the directory to the location where you want to install the JDK, then move the .tar.gz archive binary to the current directory:
tar zxf jdk-9.0.4_linux-x64_bin.tar.gz -C /usr/local
Step 3. Install JAVA using alternatives.
After extracting archive file use alternatives command to install it. alternatives command is available in
chkconfig the package:
cd /usr/local/jdk-9.0.4/ alternatives --install /usr/bin/java java /usr/local/jdk-9.0.4/bin/java 2 alternatives --config java There is 1 program that provides 'java'. Selection Command ----------------------------------------------- *+ 1 /usr/local/jdk-9.0.4/bin/java Enter to keep the current selection[+], or type selection number: 1
At this point, JAVA 9 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 /usr/local/jdk-9.0.4/bin/jar 2 alternatives --install /usr/bin/javac javac /usr/local/jdk-9.0.4/bin/javac 2 alternatives --set jar /usr/local/jdk-9.0.4/bin/jar alternatives --set javac /usr/local/jdk-9.0.4/bin/javac
Step 4. Checking Installed java version.
email@example.com ~# java -version java version "9.0.4" Java(TM) SE Runtime Environment (build 9+181) Java HotSpot(TM) 64-Bit Server VM (build 9+181, mixed mode)
Step 5. Setup global environment variables.
We can easily set the environment variables using the export command as shown below:
Setup JAVA_HOME Variable:
Setup JRE_HOME Variable:
Congratulations! You have successfully installed Oracle JDK 9. Thanks for using this tutorial for installing Oracle JDK 9 on CentOS 7 systems. For additional help or useful information, we recommend you to check the official Oracle website.