How to get user.login.id in my portlet JDeveloper12c?

user12189421

Hi,

I use jdeveloper 12.2.1.3 for creating ADF Task flow and convert it to portlet. I add user.login.id attribute to portlet.xml according to 13.3.5 How to Access User Information in JSR 286 Portlets . but I can't find any document to describe how and where to use this parameter for getting current user information in oracle web center portal.

any help is appreciated