code: protected String isSetter(final Method<?, ?> method)
     {
        String methodName = method.getName();
  
        if (!methodName.startsWith(ClassUtils.JAVABEAN_SET_PREFIX))
        {
           return null;
        }
  
        String propertyName = methodName.substring(ClassUtils.JAVABEAN_SET_PREFIX.length());
  
        return StringUtils.decapitalize(propertyName);
     }
docs: Returns whether the given method is a 'setter' method.
  
  @param method a single-parametered method. May return non-void (ie. for Fluent interfaces)
  @return the property name