Research carried out by Butler Group for its Application Server Report, published in June 2002, revealed that many application servers are based on the open source work of the Apache Software Foundation, specifically the Tomcat architecture and the Apache Web server. The latter is the most widely used Web server in the market, while the former is the basis upon which much J2EE application server functionality is presently being built.
These systems pave the way for hybrid architectures wherein the application server is ideally positioned to act in the role of integrator. An interesting point to consider is that the J2EE specification does not specifically highlight integration broker technologies. It is an area for adding value recognised by the majority of vendors and incorporated in various ways, into their products.
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