Learn how to – Install Java 12 (OpenJDK 12) on CentOS 7/6 & Fedora

Learn how to – Install Java 12 (OpenJDK 12) on CentOS 7/6 & Fedora.

This guide will discuss the steps needed to install Java 12 on CentOS 7/6 & Fedora. Java 12 reached General Availability on 19 March 2019 with Production-ready binaries released. Install JDK/OpenJDK 12 on your CentOS/Fedora system to configure Java development environment.

For Ubuntu, use How To Install Oracle Java 12 on Ubuntu

Install OpenJDK 12 on CentOS 7/6 & Fedora

OpenJDK is a free and open-source implementation of the Java Platform, Standard Edition licensed under the GNU General Public License version 2.

Visit JDK 12 releases page to download the latest version.

curl -O https://download.java.net/java/GA/jdk12.0.1/69cfe15208a647278a19ef0990eea691/12/GPL/openjdk-12.0.1_linux-x64_bin.tar.gz

Extract downloaded file using tar command.

tar xvf openjdk-12.0.1_linux-x64_bin.tar.gz

Move the resulting folder to /opt directory.

sudo mv jdk-12.0.1 /opt/

Configure Java environment:

cat <<EOF | sudo tee /etc/profile.d/jdk12.sh
export JAVA_HOME=/opt/jdk-12.0.1
export PATH=$PATH:$JAVA_HOME/bin
EOF

Add:

Source your profile file and check java command

source /etc/profile.d/jdk12.sh

Confirm Java version.

$ echo $JAVA_HOME
/opt/jdk-12.0.1

$ java --version
openjdk 12.0.1 2019-04-16
OpenJDK Runtime Environment (build 12.0.1+12)
OpenJDK 64-Bit Server VM (build 12.0.1+12, mixed mode, sharing)

$ which java
/opt/jdk-12.0.1/bin/java

Install Java SE Development Kit 12 on CentOS & Fedora

If you choose to go with Java SE Development Kit 12, download RPM package for CentOS / RHEL system using the command below.

curl -LO -H "Cookie: oraclelicense=accept-securebackup-cookie" 
"https://download.oracle.com/otn-pub/java/jdk/12.0.1+12/69cfe15208a647278a19ef0990eea691/jdk-12.0.1_linux-x64_bin.rpm"

Then install the package with the rpm command:

$ sudo rpm -Uvh jdk-12.0.1_linux-x64_bin.rpm
 warning: jdk-12.0.1_linux-x64_bin.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEY
 Preparing…                          ################################# [100%]
 Updating / installing…
    1:jdk-12.0.1-2000:12.0.1-ga        ################################# [100%]

Confirm Java version installed

$ java -version
java version "12.0.1" 2019-04-16
Java(TM) SE Runtime Environment (build 12.0.1+12)
Java HotSpot(TM) 64-Bit Server VM (build 12.0.1+12, mixed mode, sharing)

Configure Java environment.

cat <<EOF | sudo tee /etc/profile.d/jdk12.sh
export JAVA_HOME=/usr/java/default
export PATH=$PATH:$JAVA_HOME/bin
EOF

To use Java Home, source the file.

source /etc/profile.d/jdk12.sh

Test Java Installation

Create a HelloWorld Java program.

$ cat HelloWorld.java 
public class HelloWorld {

    public static void main(String[] args) {
        // Prints "Hello, World" to the terminal window.
        System.out.println("Hello, World");
    }

}

Compile Java code.

$ javac HelloWorld.java

Run your Java program.

$ java HelloWorld
Hello, World

Choosing Default Version of Java

If you have more than one version of Java installed, you can set default one using alternatives command.

sudo alternatives --config java

Recommended books:

• Best Java Programming Books
• Must-Read Books to Learn Java Programming

For Java 11 installation, see our guides below.

How to Install Java 11 on CentOS 7 / Fedora

How to Install Java 11 (OpenJDK 11) on RHEL / CentOS 8

How to Install Java 11 on Ubuntu / Debian