Solution : https://service.sap.com/sap/support/notes/1511415 (SAP Service marketplace login required)
Key words :
tomcat web container prior, disable default servlet mapping, prevent accessing servlets, inform existing customers, security constraints defined, invoker servlet issue, invoker servlet, upgrade tomcat, terms /servlet/, servlet execution
Related Notes :
1467771 | Disabling invoker servlet in the portal |
1445998 | Disabling invoker servlet |