I do not want to repeat what Markus already said, to which I fully agree. But to also answer your main point: Yes, of course JCo offers the possibility to connect to an unlimited number of SAP systems from a single Java process.
Thanks for your valuable time for Markus and you, My side I will try to find out the exact method for my use case in the respective document. I saw there many methods updated in the doc, For Multi ABAP system connection which one is the easy method can you please share some examples from the document (configuration steps ) for multi-ABAP system
JCo 3.1 is an SDK and runtime for Java applications that like to integrate via RFC with ABAP systems. How such an application is configured depends on the application. If you are planning to develop your own JCo based application, I think it makes to check the examples contained in the archive one can download from Support Portal as well as to read the documentation you can find on https://support.sap.com/jco#Documentation.
Bluesky
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