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Making a generic call to any legacy application from a runtime configuration  RSS feed

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I have a question about integration. I am working on a Rest webservice application. My applications calls multiple services. I get the configuration about the endpoint and other information from an XML file. This works as long as it is a http request to a service. But we do have legacy applications that we should call from our rest services. Those legacy applications are exposed as a jar or anything but not http. The details about the jar file will be loaded into the same XML configuration where I have the web services information. I would need to call some of the classes in those legacy apps. What would be the ideal way of leveraging the configuration information and call the legacy apps?

Any help is appreciated.

Don't get me started about those stupid light bulbs.
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