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struts 2 validation problem

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i have a XYZ form with two radio buttons. when we click first radio button some of the fileds will be displayed and those are mandatory fields which we have to enter.
when i select second radio button some other field will be displayed on the same page, and in this we have some fields as mandatory.

I am using Action-validation.xml method to do validations.
When i submit the XYZ form, it will go to the same action class and it will validate with the same action-validation for both radio button clicks.

Now when i click on first radio button(there are no second radio button related fileds displayed),
it is giving problem with validation, because i mentioned the second radio button fileds also mandatory in the validation.xml

Could you sujjest me any solution to come out from this?

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You'll have to use non-field validators and create an expression which will check the value of the radio button with the value of the field. If the radio button isn't checked, the field would not be validated (there might be an easier solution but this is the solution that I know of)...
Consider Paul's rocket mass heater.
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