For CentOS 9 / AlmaLinux 9

1. Open terminal.
   

2. Update the system:
   sudo dnf update
   

3. Install Java 17 runtime:
   sudo dnf install java-17-openjdk
   

4. For JDK (development kit):
   sudo dnf install java-17-openjdk-devel
   
   

For Debian 10 / 11 / 12

1. Update package list:
   sudo apt update
   

2. Install Java 17:
   sudo apt install openjdk-17-jdk
   

Other available packages:

• openjdk-11-jdk
  

• openjdk-21-jdk
  
  

For Ubuntu 20.04 / 22.04 / 24.04

1. Update the system:
   sudo apt update
   

2. Install recommended version:
   sudo apt install default-jdk
   Or a specific version:
   sudo apt install openjdk-17-jdk
   
   

Verify Installation

• Check Java version:
  java -version
  

• Check compiler:
  javac -version
  
  

Set JAVA_HOME Variable

1. Get the Java path:
   readlink -f $(which java)
   

2. Open environment file:
   sudo nano /etc/environment
   

3. Add the line:
   JAVA_HOME="/usr/lib/jvm/java-17-openjdk-..."
   

4. Apply changes:
   source /etc/environment
   

5. Confirm:
   echo $JAVA_HOME
   
   

Optional: Oracle JDK (Manual Installation)

1. Download the .tar.gz archive from Oracle.
   

2. Extract to /opt/java/.
   

3. Manually set JAVA_HOME and add to PATH.
   
   

Summary Table