====== Install JAVA ======
===== For Linux =====
==== Linux CentOS/RedHat ====

  * 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


==== 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 [To try first in case it is already available]
  java --version
  
==== Manual install ====
**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.

===== For Windows ======
  * 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

{{:products:promonitor:6.7:installguide:pasted:20191023-122129.png}}

=== Migration from JAVA JRE to OpenSDK ===
  * **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.

{{.:service_java.png}}

**Need to troubleshoot:** [[..:troubleshooting:install]]

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