Administration guide > Troubleshoot > Messages > SESN: Messages for the WebSphere eXtreme Scale HTTP Session manager
SESN0012E
SessionData.putValErr1=SESN0012E: Null key entered. The HttpSession.putValue or HttpSession.setAttribute method was called from a servlet or JSP with a null key.
Explanation
The HttpSession.putValue or HttpSession.setAttribute method cannot be called with a null key.
User response
Fix the servlet or JSP to pass a non-null key.
Parent topic:
SESN: WebSphere eXtreme Scale messages for the WebSphere eXtreme Scale HTTP Session manager