HI William,
I don't see any tag with name "cmpCa" on your
JSP page. That's why you are getting null for when you try to search for "cmpCa" on request object.
Now the button delete works normally, however the button update doesn't works.
Yes it should wok because it doesn't execute the following condition :
Normally what i will do for debugging is to change the form method from post to get in jsp to check the parameter and value that are to my service method. I would suggest the same for you to check for the presence of any parameter with name "cmpCa".
Regards,
Hemant