JDK SDK 1.6 must be installed on your Tomcat host and when compiling from source. Note that it is not sufficient to have a JRE installed as Tomcat requires the compiler at runtime! It is, however, possible for JDK 1.6 to co-exist on systems that already have other JDKs installed.

Maven (version 2.2.x or later) is required in order to build and deploy the OLAT application. Note that during the build Maven will download depedencies and that an Internet connection is required during the build. It is recommended to ensure that adequate runtime heap memory is allocated to the Maven process (esp. when invoked as an external tool from an IDE) so you may wish to set the MAVEN_OPTS environment variable to include -Xms1024m -Xmx1024m (please see Maven documentation for details.)

Tomcat web container (version 6.x or later) to host the web application. On UNIX systems OLAT recommends that Tomcat runs under a dedicated user (e.g., "tomcat") for security reasons. In situations where more than one instance is required (e.g., multiple cluster nodes on the same host) it is worth setting up each OLAT instance in its own JVM and sharing a common base installation (see Tomcat documentation concerning CATALINA_BASE installations.)

MySQL (version 5.0.x or later.) Since OLAT uses the InnoDB storage engine which employs a single tablespace and logfile structure per database instance it is recommended that OLAT be provided with a dedicated instance. On UNIX systems OLAT recommends that MySQL runs under a dedicated user (e.g., "mysql") for security reasons. Note that for the installation you will need to have administrative acces to your database (e.g., the root account)

Openfire (version 3.4.x or later.) to support Instant Messaging (XMPP) This component is optional and may be omitted if you do not wish to use such services.