Question

I am using a JSP bean and when I do an assignment to a new object, it gets over-written on a submit to the previous object.

<jsp:useBean id='base' class='com.example.StandardBase' scope='session' /> ... //base object id  = 396 base = new Base() //base object id = 1000 

and on a resubmit of the page I get

<jsp:useBean id='base' class='com.example.StandardBase' scope='session' /> //base object id = 396 

Is there a way to tell JSP to do a new assignment?

Answer 1

I’m not completely sure, but I think base = new Base() does not update the reference stored in the session scope. Therefore, the bean you created with the initial <jsp:useBean/> is still around while the one you create manually, and then updated, isn’t.

Get rid of base = new Base() and you should be fine.

If you insist upon updating it, you use HttpSession.setAttribute(). Like so:

session.setAttribute('bean', bean); 

I believe the variable session is automatically created and initialized for you by the JSP engine.