Ok ! Sorry, I didn't understand that the output was the answers list.
Same thing here. your DoEndTag returns SKIP_PAGE, so it stops there, after the first evaluation of your 2 custom tags in the JSP.
Should have returned EVAL_PAGE to have the other custom tag evaluated.
Try to find the traps. Almost all the questions are trapped like that. Try to find weird thing like SKIP_PAGE. It isn't normal so the example won't work as logically it supposed (in this case, evaluating the two tags).