it is correct. you can yourself test it also. if the attribute named by var already exists in the specified scope and the value specified is not null then it will be overwritten. also if the value is null the attribute will be removed.
Joined: Nov 14, 2012
Thanks for the answer.
After I saw some inconsistencies, errdata, and misprintings in Servlet 3.0 specs, some books, and mock exams, I am now suspicious of anything that I read. A skeptic gone exteme.