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Do I still need to follow CORBA, RMI architecture even when using Web services?

Web services enable integration. Is it true that to connect to AS/400, COBOL based system, you still need to follow Corba, RMI architecture even when using Web services?
It depends on how the back-end systems are enabled. AS/400s, COBOL, and other legacy systems can do Web services, but they have to be augmented so they expose Web services. If they are already exposing services through RMI or Corba, than you can use those service-based interfaces instead, or translate those interfaces into Web services standards.

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