Callista Enterprise AB is a consulting company specialist in enterprise aspects of software development and integration (including SOA). We have pioneered Java EE- and SOA reference architectures at many global swedish enterprises. In early 2005 we formalized a Spring-based enterprise component architecture for Volvo Car, sharing many of the concepts that went into OSOA SCA. We are currently busy exploring a SCA- and JBI-inspired composite application reference model for Service-Oriented Integration, targeting traditional ESB products, like WebSphere Message Broker, Mule etc.