The action will be the same as what u give in ur <action path="". no need to pass anything here just the diff between Dispatchaction and mappingda is taht here u need not pass that parameters value in query string that u can directly write in conig files paramter attribute
Since the form bean type is the same for both getCustomer and updateCustomer, you can put any one in the form action. Lets say you use "getCustomer". Your form would then look like this.
Remove the hidden control, it is not required anymore. <html:hidden property="methodToExecute" value="unknownMethod"/>