• Use the existing package installer (apt or yum for example) to install or upgrade latest GA version of JAVA OpenJDK
• 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

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

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

wget https://download.java.net/java/GA/jdk20.0.1/b4887098932d415489976708ad6d1a4b/9/GPL/openjdk-20.0.1_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 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.

• Stop Redpeaks service
• You can use the latest JAVA OpenJDK GA version (currently 13) available here: https://jdk.java.net/
• Download the windows/x64 archive from the build section and unzip it in your usual Java install path: C:\Program Files\Java
• Add the path to the JAVA bin folder within your SYSTEM Path variable (Example: C:\Program Files\Java\openJdk_12\bin)
• Set JRE_HOME environment variable to the JAVA installation folder
• Open a shell and execute java –version you should see a similar screen, mentioning 64-Bit Server VM
• Start the Redpeaks service

• Stop Redpeaks service
• Download the OpenSdk Archive and expand it.
• Uninstall former versions of JAVA
• Remove folder C:\ProgramData\Oracle (Hidden folder)
• Set PATH SYSTEM environment variable to the folder of java.exe (Example: C:\Program Files\Java\openJdk_12\bin)
• Set JRE_HOME SYSTEM environement variables to the install folder of java (Example: C:\Program Files\Java\openJdk_12)
• Execute program [PROMONITOR_INSTALL_FOLDER]\bin\pro_monitorw.exe : Open Java tab and check that Java Virtual Machine is set to the correct location.

Need to troubleshoot: Installation problems

Warning:

• Avoid installing version 151 and 161 of Java 8, it has known issues preventing to use compression between server and browsers