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The aim of JBI is to allow integration components and services to be integrate in a vendor independent way, allowing users and vendors to plug and play. Here's an overview of a typical JBI enabled SOA from Sun
ServiceMix is lightweight and easily embeddable, has integrated Spring support can be ran as a standalone ESB provider, as a service within an ESB or within a J2EE application server.
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In addition ServiceMix provides an implementation of WS Notification.Here's an overview of a typical JBI enabled SOA from Sun
Architecture
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