The smartclient lets remote clients download classes and other resources necessary for connecting to JOnAS services (JNDI context factories, EJB3 interceptors, ...) directly from the JOnAS server they're dealing with.

This way, the heavy clients only need to include a lightweight JAR file for the Smartclient client and are always guaranteed to have the good versions of all components.

Here is the part of jonas.properties concerning the smartclient service:

###################### JOnAS/EasyBeans Smartclient service configuration
#
#  Set the name of the implementation class of the smartclient service.
jonas.service.smartclient.class         org.ow2.jonas.smartclient.internal.SmartclientServiceImpl
# port number the Smartclient service listens on
jonas.service.smartclient.port          2503