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The oldest supported Java RFA API is version 7.6.X which uses Java 1.7. There are no older versions available for download. There are older unsupported versions of RFA that did work with Java 1.6 but can't be accessed any longer.
Thanks for your prompt answer Nick !
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Can RFA Java application connects to services hosted on a different machine/port from a single Session?
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connection with RFA API by java down but the trip is working fine