In Chapter 1, we discussed ESB architecture which can facilitate the collaboration between services. JBI provides a collaboration framework which provides standard interfaces for integration components and protocols to plug into, thus allowing the assembly of SOI frameworks.
JSR 208 is an extension of J2EE, but it is specific for JBI Service Provider Interfaces (SPI). SOA and SOI are the targets of JBI and hence it is built around WSDL. Integration components can be plugged into the JBI environment using a service model based on WSDL. Service composition is a major target in ESB architecture and the JBI environment aggregates multiple service definitions in the WSDL form into the message infrastructure.
In the context of a larger service composition, we have multiple partners (service providers or service consumers) and the metadata for interaction of these individual partners are termed as the business protocol. The metadata of choreography played by a business process...