The success of J2EE and JTA/JCA have lead to more and more complex integration scenarios: multiple vendor-specific connectors are plugged into application servers such as JBoss, and many of these connectors are based on open-source themselves. Unfortunately, many databases that we know of (both open-source and commercial) have failed to implement the necessary functionality for being truly enterprise-class. In this talk we present the most common mistakes that we have encountered, and show how JBoss can be used for truly robust integration. Intended audience: people who want to use JBoss for mission-critical integration projects (such as financial industries and telecom), and people who want to write robust XA-capable resource adapters for JBoss (such as RDBMS or JMS developers).