Logging with specific label in log file for every user

I have web application in Java (JSP + Servlets) and logging with log4j 1.2.17. When user login on site he take ID. I wanna see all his actions in log file with ID prefix like this:

01.05.2015 11:12:30 INFO [Roy] - login correct

But i don't want to pass ID in every calling method to logging events in that method. I want to save ID somewhere and take it when need.