Hi, I am trying to change the input jsp page of my action mapping in the validate method of my form bean using mapping.setInput() method. Then, I get a "Configuration is frozen " error message. Can anyone tell me how i can dynamically change the input for my action mapping during validation. This is because i have my application designed like this. I have to make user input across 4 input forms. All these 4 input forms share the same form bean. The fields which are not input in a particular form are as hidden fields. form1 calls action2 to load form2. form2 can call action1 to load form1 or action3 to load form3. form3 calls action2 to get form 2 and action4 to call form4. Now, my problem is this. when i am in form2, and i call action3, my input is form2 and if validation fails, form2 has to display errors. so in my action mapping for action3, if i specify form2 as my input, then if i call action3 from form4, my input is being taken as form2 instead of form4. so i have a hidden field telling which form i am in, and wanted to set the input field of the mapping dynamically in the validate method. This leads to the above error. can anyone offer me a solution to this problem telling me how can i overcome this problem.