Solution : https://service.sap.com/sap/support/notes/723562 (SAP Service marketplace login required)
Key words : 
java runtime classes {library prefix}sapjcorfc{shared library extension} - jni runtime library, native code {library prefix}rfccm{shared library extension}, multiple files named jco<date>_<time>, command           java -jar {sapjco-install-path}/sapjco, typing           java -jar {sapjco-install-path}/sapjco, java -classpath {sapjco-install-path}/sapjco, os specific library path environment variable, sap java connector runtime environment consists, named rfc<processid>_<threadid>, shell environment variable rfc_trace_dir=<path>
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