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== Java JDK requirements ==

Openbravo needs the full Java JDK (not just JRE) installed.

For the specific versions supported and the currently recommended version check the [[System_Requirements#Server:_software_stack|System Requirements]].

In general you should never pick a version lower then the recommended ones, but are free to pick higher version if they are supported.

What is required for Openbravo is:

# Working Java JDK
# JAVA_HOME variable does point to java installation directory
# java binaries (i.e. java & javac) in system path (so runnable from a shell / command line without specifying a path)

=== Example Java install on Ubuntu 18.04 LTS ===

Install the headless variant of the JDK for a server installation.
<source lang="bash">sudo apt-get install openjdk-11-jdk-headless</source>

{{(!)|While the package name is 'openjdk-11' as of writing this guide in October 2018 it does still contain OpenJDK 10. Ubuntu will replace that soon with OpenJDK 11 for long term support.}}

Add config file to specify JAVA_HOME
<source lang="bash">sudo su -
echo 'export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64' > /etc/profile.d/base-variables.sh
</source>

=== Example install Java SDK on Microsoft Windows ===

{{(!)|This section was written for an older version and is outdated. It is kept as a reference but should not be just used 'as written'}}

{{(!)|The path where Java is installed here will be used in several places later (Tomcat Service Manager config + JAVA_HOME variable).
If it should ever change (i.e. after a Java Update it is important to also change it in those other places.}}

#Download and install [http://java.sun.com/javase/downloads/index.jsp JDK 8].
#Add the JAVA_HOME environment variable:
## Right-click on '''My Computer'''.
## Select '''Properties'''. The System Properties window appears.
## Select the '''Advanced''' tab then click '''Environment Variables'''.
## Click '''New'''. The New System Variable box appears.
## In the '''Variable name''' field, type ''JAVA_HOME''.
## In the '''Variable value''' field type the path of the JDK installation directory. This is usually ''C:\Program Files\Java\jdk1.8.0_<version>''
## Select the PATH environment variable.
## In the '''Variable value''' field you type the following ''%JAVA_HOME%\bin''. This will reuse the JAVA_HOME variable we just defined.

==== How to test the installation ====

To test that all steps above have been done correctly check all the following commands that they work and verify their output.

Open a Command Prompt (cmd.exe):

The next 2 commands should both work fine and show the version of java you have just installed.

#<pre>java -version</pre>
#<pre>javac -version</pre>

The next command should work and show the path in which you have installed Java.

#<pre>echo %JAVA_HOME%</pre>

If any of those previous steps did not work go back and fix it now. As it will otherwise lead to problem later on.

[[Category:Installation]]