JOnAS is an application server developed by the OW2 consortium. He hosts and deploys applications written in Java. However, an application can not be natively deployed more than once in an instance of JOnAS. If necessary, the application will be deployed on another server instance because there is a risk of collision. One solution to this problem is "multitenancy".
This new feature provides the ability to deploy the same application multiple times on a single instance of JOnAS without previous configuration in the application while ensuring security and isolation between each instance.
To meet the new features of cloud computing available soon in the specifications of Java EE7 and particularly that of multitenant (sharing an application by several entities called tenants), JOnAS proposes to deploy an instance of the application per tenant in the server.
For more information, please visit http://jonas.ow2.org/xwiki/bin/view/JPaaS/Multitenancy