One should distinguish two java components:

  • JRE: The Java Runtime Environment enables end-users to execute java programs.
  • JDK: The Java Development Toolkit allows developers to develop java programs.

The JRE can be installed and used independently from the JDK. By contrast, the JDK comes usually with a JRE. Here are short instructions to install the JDK (including the JRE). More information is available on the java installation guide:

On Windows:

  • Download the jdk from the java download page.

  • Create the following directory structure:

  • Install the JDK in %SCRIBESTOOLS%\Java\JDK and the JRE in %SCRIBESTOOLS%\Java\jdk

  • Add the following directory to the system PATH:

  • Set the JAVA_HOME environment variable to:


On Ubuntu:

# Remove existing OpenJDK
sudo apt-get purge openjdk*
# Install Oracle Java 8
# if add-apt-repository is missing in the next command
#     sudo apt-get install software-properties-common
#     sudo apt-get install python-software-properties
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer
# Set Java Environment Variable
sudo apt-get install oracle-java8-set-default

If this does not work try instead to follow the instructions how to install oracle java 9 in debian.

Launching Java

To test the JRE type the following command:

java -version

To test the JDK type the:

javac -version