How to retrieve checkbox values in Struts 2 action class ?

Question

I have dynamic number of checkboxes in jsp page as given below.

Answer 1

Actually I use Struts 2 3.8 and WebSphere 7.0 and Map works for rendering the check boxes, but not working when these check boxes post back. The Boolean class is rendered correctly, but during the post back in Struts 2, it becomes ognl.NoConversionPossible and ends up with No result defined for action CLASS ...and result input error.
I replaced Boolean with String class, i.e.

maps.put(new Integer(0), new String("true")); 

and it works for me.