Session variables sometimes lost

[Stephane Grialet]

hello,   i'm having problems into various portlets and screens i have written, using the following code line to get the uid of the connected user:   String username = (String) rundata.getSession().getAttribute("username");   It works almost always... but sometimes it returns "null" instead of the uid, and after a good number of tests i didn't succeed finding neither why nor under which circumstances it happened. Can someone help me ?   To be sure the user session variables were set right after the connection, i had a few weeks ago added in the "JLoginUser.java" program the following code:   <    username = data.getParameters().getString("username","");    password = data.getParameters().getString("password","");    data.getSession().setAttribute("username",(Object) username);    data.getSession().setAttribute("password",(Object) password); >   And until my latest developed portlet and screens, it seemed to work OK on my Java programs.  Was i right to set these session variables that way and at this place ? Are there other places i should set them to be sure that then, from any part of the application (portlet, screen, action,...), and at any time, i will be able to get these session variables values using the rundata.getSession().getAttribute() method. Or am i using a wrong method ?   thanks, St�phane