The event bus functionality for EDA components is implemented by webMethods Universal Messaging or webMethods Broker by using the JMS protocol.

webMethods Universal Messaging is a Message Oriented Middleware product that guarantees message delivery across public, private and wireless infrastructures.

webMethods Broker is a high-performance message server that provides organizations with the foundation for state-of-the-art integrated electronic business applications. Broker provides communication among distributed application components in the event-driven architecture.