This article explain you how to install and configure Java JDK latest version on CentOS /RHEL servers. Here We are going to install latest Java 14 JDK on CentOS 8 Version. Below is my CentOS Server information.
Operating System: CentOS Linux 8 (Core)
CPE OS Name: cpe:/o:centos:centos:8
Kernel: Linux 4.18.0-147.el8.x86_64
Architecture: x86-64
Download Java 14 JDK Latest Version
Download latest Java SE Development Kit 8 from its official Java vendor website. Below are the steps to extract download jdk file in temporary folder in linux . You have to download the tar archived file. We downloaded the jdk file in our tmp folder. So we will go into the /tmp folder and extract there.
# cd /tmp # wget https://download.java.net/java/GA/jdk14/076bab302c7b4508975440c56f6cc26a/36/GPL/openjdk-14_linux-x64_bin.tar.gz # tar xzf openjdk-14_linux-x64_bin.tar.gz # mv jdk-14 /opt
Install Java 14
Now we have got extracted folder of java (jdk1.8.0_241). Alternatives command is the best way to install java. Go to the extracted folder of java and run like below command as showing.
# cd /opt/jdk-14 # alternatives --install /usr/bin/java java /opt/jdk-14/bin/java 2/opt/jdk1.8.0_241/bin/java 2
Now we should set jar and javac path
# alternatives --install /usr/bin/jar jar /opt/jdk-14/bin/jar 2 # alternatives --install /usr/bin/javac javac /opt/jdk-14/bin/javac 2 # alternatives --set jar /opt/jdk-14/bin/jar # alternatives --set javac /opt/jdk-14/bin/javac
Set Java Environment Variables :
After the set of javac and jre path , we will set the environment variables in linux . So many application needs to use the JAVA_Home or JRE_HOME environment variables for java executable to use, even you can not see java version without environment variables set.
To set java home variable use below command.
export JAVA_HOME=/opt/jdk-14/
To set jre home variable use below command
export JRE_HOME=/opt/jdk-14/jre/
To set the path variables use below command
export PATH=$PATH:/opt/jdk-14/bin:/opt/jdk-14/jre/bin
Verify Installed Java Version
Now check the version of installed java on linux box through below command
# java --version openjdk 14 2020-03-17 OpenJDK Runtime Environment (build 14+36-1461) OpenJDK 64-Bit Server VM (build 14+36-1461, mixed mode, sharing)
If your java command not running after set the environment variables then add below lines in bashrc and profile files in /etc directory.
JAVA_HOME=/opt/jdk-14/
export JRE_HOME=/opt/jdk-14/jre
export PATH=$JAVA_HOME/bin:$PATH
Congratulations, Now we have install , run and configure java !
