In Charles Lyon's book there is nothing about thread safety on context, session, request attributes.
Does this subject is still required for the exam ?
These topics are still covered in the Servlet 3.0 specs, so I guess it is still good to learn. Whether it is part of the EE6 exam I am not sure, as I am also not sure if the book of Charles Lyon covers all the exam topics.
Regards,
Frits
Don't get me started about those stupid light bulbs.