Java is a secure, stable, and well-known, general-purpose programming language and computing technology platform with many interconnected capabilities.
To run Java-based applications, you must have Java installed on your server. You mostly need the Java Runtime Environment (JRE), a collection of software components used to run Java applications on the Linux machine.
If you want to develop software applications for Java, you need to install the Oracle Java Development Kit (JDK), which comes with a complete JRE package with tools for developing, debugging, and monitoring Java applications and it is an Oracle’s supported Java SE (Standard Edition) version.
Note: If you are looking for an open-source and free JDK version, install the OpenJDK which provides the same features and performance as Oracle JDK under the GPL license.
In this article, we will show you how to install OpenJDK 16 from the EPEL repository and Oracle OpenJDK 17 (the latest release) using binary packages in RHEL-based Linux distributions such as CentOS, Fedora, Rocky Linux, and AlmaLinux to develop and run Java applications.
Install OpenJDK 16 in CentOS/RHEL and Fedora
At the time of writing this article, OpenJDK 16 is the currently available version to be installed using the following commands from the EPEL repository.
# yum install java-latest-openjdk # java -version
Sample Output
openjdk version "16.0.1" 2021-04-20 OpenJDK Runtime Environment 21.3 (build 16.0.1+9) OpenJDK 64-Bit Server VM 21.3 (build 16.0.1+9, mixed mode, sharing)
Install Oracle OpenJDK 17 in CentOS/RHEL and Fedora
To install Oracle OpenJDK 17, you need to download the production-ready OpenJDK 17 from the Java SE Downloads page or run the following wget command to download and install it as shown.
# wget --no-check-certificate -c --header "Cookie: oraclelicense=accept-securebackup-cookie" https://download.oracle.com/java/17/latest/jdk-17_linux-x64_bin.rpm
Install the package using the following command:
# yum localinstall jdk-17_linux-x64_bin.rpm
Next, confirm the installed Java version.
# java -version java version "17.0.1" 2021-10-19 LTS Java(TM) SE Runtime Environment (build 17.0.1+12-LTS-39) Java HotSpot(TM) 64-Bit Server VM (build 17.0.1+12-LTS-39, mixed mode, sharing)
Set Default Java Version
If you have more than one Java version installed on the system, you need to set the default version using the alternatives command as shown.
# alternatives --config java
Sample Output
There are 2 programs which provide 'java'.
Selection Command
-----------------------------------------------
*+ 1 /usr/java/jdk-17.0.1/bin/java
2 java-latest-openjdk.x86_64 (/usr/lib/jvm/java-16-openjdk-16.0.1.0.9-3.rolling.el8.x86_64/bin/java)
Enter to keep the current selection[+], or type selection number: 2
Just, enter the number to set the default Java version on the system.
Finally, check the Java version.
# java -version
Sample Output
openjdk version "16.0.1" 2021-04-20 OpenJDK Runtime Environment 21.3 (build 16.0.1+9) OpenJDK 64-Bit Server VM 21.3 (build 16.0.1+9, mixed mode, sharing)
Congratulations! You’ve successfully installed the latest version of Oracle OpenJDK in RHEL, CentOS, Fedora, and Rocky Linux/AlmaLinux to develop and run Java applications.
