how to put validation on inputbox for integer input only

thanks for responding.The salary property is int in baean and i have also added message attribute to inputText.the problem is where to put code for checking the datatype and how to call it?plz give me any one answer out of many, also URL provided by u is not correct.

yes i agree it gives msg "{0}": Error during model data update"we can understant this msg but not the end user,also it says nothing abt invalid characters input there.