Solution : https://service.sap.com/sap/support/notes/1013976 (SAP Service marketplace login required)
Key words : 
entry     /dialog/sdtserverconnection/sdtgui/launch = true, /dialog/sdtserverconnection/sdtgui/launch = false2, terms java support package manager, bat          lib\            <jar archives>, hostname <machine_name>/<ip_address> socket 6240, os400 check sap note 885063, link start jspm frontend, mount jspm file system, java web start technology, directory structure   <some_dir>          startgui
Related Notes : 
       
| 1443834 | Central SAP Note JSPM 7.2 | 
| 1147119 | Central SAP Note JSPM 7.1 |