Lightweight application servers are widespread in enterprise information systems while monolithic Java EE^TM servers have been considered overly complex. Today, the Apache Tomcat application server is the most widely used web container in the world. Tomcat is commonly included in proprietary development frameworks such as Spring (SpringSource) and Hibernate (Redhat) which create vendor lock-in and monopolize their positions, effectively reducing a client's future options. OW2 JOnAS 5 offers a clear solution to vendor lock-in, because it is based on open standards. JOnAS 5 takes this a step further by simplifying software production and providing innovative services, an application integration framework, and powerful yet simplified administration. …