Java is a programming language and computing language platform. Java 11 is the open-source reference implementation of version 11 of the Java SE Platform as specified by JSR 388 in the Java community process. JDK is a collection of various programming tools among them are; JRE (Java Runtime Environment), Java, Javac, Jar e.t.c.

Java 11 has many features among them are:

  • Java 11 adds a few new methods to the String class
  • New File Methods
  • The Not Predicate Method
  • The new HTTP client from the java.net.http package
  • Local-Variable Syntax for Lambda
  • Nest Based Access Control
  • Improved Aarch64 Intrinsics
  • A No-Op Garbage Collector

This article demonstrates how to install Java 11 (OpenJDK 11) on Rocky Linux 8|AlmaLinux 8.

1) Install Java 11 (OpenJDK 11)

We will cover a few ways of how to get Java 11(OpenJDK 11) installed on Rocky Linux 8|AlmaLinux 8.

  1. OpenJDK
  2. Oracle JDK/JRE

Install OpenJDK 11 on Rocky Linux 8|AlmaLinux 8

Java Development Kit 11(JDK) is the open source reference implementation of version 11 of the Java SE platform. OpenJDK is available from RHEL 8 for x86_64 – AppStream (RPMs).

Option 1 – Install OpenJDK 11 from YUM repositories

To install Java 11 on Rocky Linux 8|AlmaLinux 8 from default upstream repositories run the commands below:

sudo yum install java-11-openjdk java-11-openjdk-devel

Confirm Java version:

$ java -version
openjdk version "11.0.25" 2024-10-15 LTS
OpenJDK Runtime Environment (Red_Hat-11.0.25.0.9-1) (build 11.0.25+9-LTS)
OpenJDK 64-Bit Server VM (Red_Hat-11.0.25.0.9-1) (build 11.0.25+9-LTS, mixed mode, sharing)

Option 2 – Using Oracle JDK Binary

You can as well download manually using wget or curl command line tool:

sudo dnf -y install wget curl

Then download Oracle JDK 11 binary for your architecture.

Install the package on your system:

$ sudo rpm -Uvh jdk-11.*_linux-x64_bin.rpm
warning: jdk-11.0.25_linux-x64_bin.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEY
Verifying...                          ################################# [100%]
Preparing...                          ################################# [100%]
Updating / installing...
   1:jdk-11-2000:11.0.25-ga           ################################# [100%]

Verify your Java installation.

$ java -version
openjdk version "11.0.25" 2024-10-15 LTS
OpenJDK Runtime Environment (Red_Hat-11.0.25.0.9-1) (build 11.0.25+9-LTS)
OpenJDK 64-Bit Server VM (Red_Hat-11.0.25.0.9-1) (build 11.0.25+9-LTS, mixed mode, sharing)

2) Set the Default Java Version

With Multiple Java versions installed on Rocky Linux 8|AlmaLinux 8. You can set the default one as below.

First list the available versions:

sudo alternatives --config java

Sample output if your system has multiple versions:

There are 2 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*  1           /usr/java/jdk-17/bin/java
 + 2           java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.25.0.9-3.el9.x86_64/bin/java)

Enter to keep the current selection[+], or type selection number: 2

Select your version by typing the number as above.

Verify the Java 11 installation

With the default version set, go ahead and verify the version using:

$ java -version
openjdk version "11.0.25" 2024-10-15 LTS
OpenJDK Runtime Environment (Red_Hat-11.0.25.0.9-1) (build 11.0.25+9-LTS)
OpenJDK 64-Bit Server VM (Red_Hat-11.0.25.0.9-1) (build 11.0.25+9-LTS, mixed mode, sharing)

3) Test Java Installation

Let us now test the installed Java by creating a simple html file with the below content.

vi HelloWorld.java

In the file paste this:

public class helloworld {
  public static void main(String[] args) {
    System.out.println("Hello Java World from Kenya!");
  }
}

Compile and execute Java code.

$ java HelloWorld.java
Hello Java World from Kenya!

Conclusion

The article demonstrates how to install Java 11 (OpenJDK 11) on Rocky Linux 8|AlmaLinux 8. We have seen the two ways to get Java 11 installed on Rocky Linux | Alma Linux.

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