===== Install JAVA =====
 
==== Linux Open SUSE Leap 15.2 =====

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
  java --version


If a JAVA version is already installed on your system before the installation of openjdk 15, 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.

==== Linux CentOS/RedHat =====

  * Use the existing package installer (apt or yum for example) to install latest GA version of JAVA OpenJDK (currently 15)
  * Example on CentOS: 

  yum install java-latest-openjdk-headless.x86_64   # Installs the latest OpenJDK binaries
  alternatives --config java                        # In case of upgrade: Switches the links to point to the new version
  java -version                                     # Check you run the latest version 

  * Or download the Linux/x64 archive from https://jdk.java.net/ and decompress it in your usual Java install path and update /usr/bin/java link
  * Refer to the online documentation specific to your Linux distribution

==== Generic ====
  * You can download the archive from https://jdk.java.net/ and use **alternatives** to setup the configuration
  * Example:

   wget https://download.java.net/java/GA/jdk22.0.1/c7ec1332f7bb44aeba2eb341ae18aca4/8/GPL/openjdk-22.0.1_linux-x64_bin.tar.gz
   tar zxvf openjdk-22.0.1_linux-x64_bin.tar.gz
   mv jdk-22.0.1 /usr/lib/jvm
   alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-22.0.1/bin/java 99
   alternatives --config java
   >> Choose the one you installed