Solution : https://service.sap.com/sap/support/notes/663120 (SAP Service marketplace login required)
Key words : 
driverlocation=/usr/sap/rb6/sys/jdbc/ntv/db2_classes, driverlocation=/usr/sap/rb6/sys/jdbc/tbx/jt400, dirs=/usr/sap/<sid>/sys/j2ee/extis sufficient, sap system installation                      sep/20035 final installation steps                        dec/20036 troubleshooting                                  sep/2003+===================================================================+ 1, dirs\=/usr/sap/<sid>/sys/j2ee/extyou, dirs=/usr/sap/<sid>/sys/j2ee/ext, dirs\=/usr/sap/<sid>/sys/j2ee/ext, path /usr/sap/<sid>/<instance>/j2ee/cluster, path /usr/sap/<sid>/<instance> /j2ee/cluster, topics                                          date changed======                                          ============1 general information2 errors
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