Install JAVA

It is recommended to install the latest JAVA openjdk release available

Caution: Software releases produced after October 2025 will require running openJDK 21 or above.

• Please if you are on RHEL/Red Hat, upgrade Java using dnf sudo dnf install -y java-21-openjdk (internet access required)
• Otherwise, use redpeaks java installer, the script must be able to reach https://download.java.net
• Look for install_java.sh file in Redpeaks install package (tar archive)
• Execute the script, it will download and install latest java open JDK runtime.
• Run java -version to confirm you are running the latest version.

Note: In the below example, jdk install folder is in /usr/lib/jvm/

wget https://download.java.net/java/GA/jdk25.0.1/2fbf10d8c78e40bd87641c434705079d/8/GPL/openjdk-25.0.1_linux-x64_bin.tar.gz
tar zxvf openjdk-20.0.1_linux-x64_bin.tar.gz -C /usr/lib/jvm/
alternatives --install  /usr/bin/java java /usr/lib/jvm/jdk-20.0.1/bin/java 99
alternatives --config java -> select new version

If a JAVA version is already installed on your system before the installation, use alternatives command to change the java version used by your system.

alternatives --config java                        # In case of upgrade: Switches the links to point to the new version
# logout and login again to have the environment variables defined.

• Use the system package manager (dnf/yum) to install or upgrade the latest supported OpenJDK version
• Example on CentOS/RHEL:

  sudo dnf install -y java-21-openjdk-headless    
  sudo alternatives --config java
  java -version

• Refer to the online documentation specific to your Linux distribution.

Run the following commands to install JAVA openjdk 15

zypper up
zypper ar http://download.opensuse.org/repositories/Java:/Factory/openSUSE_Leap_15.2/ java
zypper mr -p 70 java
zypper refresh
zypper in java-15-openjdk [To try first in case it is already available]
java --version