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Magnolia needs a Java Runtime Environment (JRE) version 8 or higher. Type java -version in a terminal or command prompt. If the system reports a version number, Java is installed on your computer.

$ java -version
java version "10.0.1" 2018-04-17
Java(TM) SE Runtime Environment 18.3 (build 10.0.1+10)

If you don't have Java, install it:

 Mac OS X

Java is not pre-installed on Mac OS X 10.7 and later. Download the latest Java from Oracle.

 Windows

On Windows you need a Java SE Development Kit (JDK). The Java Runtime Environment (JRE) is not enough because the Tomcat application server does not recognize it.

What is the difference?

  • JRE is for users who run Java programs on their computer.
  • JDK is for developers who write Java-based applications.

Download and install JDK. By default JDK is installed in C:\Program Files\Java\jdk-10.0.xx\. You can choose another location.

Check JAVA_HOME environment variable

  1. Open the command prompt.
  2. Type set and press ENTER.
  3. Find JAVA_HOME in the command output and verify that the path points to your JDK installation directory, for example C:\Program Files\Java\jdk-10.0.xx.
  4. If JAVA_HOME is missing or it points to the wrong directory, see Set JAVA_HOME environment variable below.

Set JAVA_HOME environment variable

  1. Right-click My Computer and select Properties.
  2. Go to the Advanced tab. 
    (In Windows 7+, right-click Computer and select Advanced System Settings, then Environment variables.)
  3. If the JAVA_HOME environment variable does not exist in User variables or System variables, create it:
    • User variables apply to the currently signed-in user only. Create JAVA_HOME here if you want it to apply only to the currently logged in user. These variables take precedence over system variables.
    • System variables apply to all users. Create JAVA_HOME here if you want it to apply to all users. You must be an administrator to modify a system environment variable. 
  4. Set the value of JAVA_HOME to the path of your JDK installation directory, for example C:\Program Files\Java\jdk-10.0.xx.
  5. Optional step: Add the Magnolia bin directory to the PATH variable, for example C:\Program Files\magnolia\apache-tomcat-x.y\bin. Setting the PATH allows you to issue the Magnolia start and stop commands from anywhere without navigating to the installation directory first. Separate the path from existing paths with a semicolon ( ; ). If you do this, you also need to add CATALINA_HOME to environment variables. Set the value of CATALINA_HOME to the Tomcat installation directory, for example C:\Program Files\magnolia\apache-tomcat-x.y
  6. Click OK.
  7. Go back to Check JAVA_HOME environment variable above and test that the variable is found and has the correct value. You need to open a new command prompt since environment variables are session specific.

Alternatively you can set JAVA_HOME with a batch file. Add this line to /apache-tomcat/bin/magnolia_control.bat:

set JAVA_HOME=C:\Program Files\Java\jdk-10.0.xx

The set command creates the JAVA_HOME environment variable and sets its value to the JDK directory. The command is executed when Magnolia starts.

 Linux

Download the latest Java from Oracle. The installation directory varies from one Linux system to another. For example, on Ubuntu Linux 10 the OpenJDK Runtime Environment is installed in /usr/lib/jvm/java-10-openjdk/jre by default.

 Solaris

Download the latest Java from Oracle. You can install it in any directory such as /usr/java .

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