PropertyDescriptor getPropertyDescriptorForPropertyPath(String propertyPath, Class<?> propertyType) {
        int pos = PropertyAccessorUtils.getFirstNestedPropertySeparatorIndex(propertyPath);
        // Handle nested properties recursively.
        if (pos > -1) {
            String nestedProperty = propertyPath.substring(0, pos);
            String nestedPath = propertyPath.substring(pos + 1);
            PropertyDescriptor propertyDescriptor = BeanUtils.getPropertyDescriptor(propertyType, nestedProperty);
//            BeanWrapperImpl nestedBw = getNestedBeanWrapper(nestedProperty);
            return getPropertyDescriptorForPropertyPath(nestedPath, propertyDescriptor.getPropertyType());
        } else {
            return BeanUtils.getPropertyDescriptor(propertyType, propertyPath);
        }
    }
PropertyDescriptor getPropertyDescriptorForPropertyPath(String propertyPath, Class<?> propertyType) {
        int pos = PropertyAccessorUtils.getFirstNestedPropertySeparatorIndex(propertyPath);
        
        if (pos > -1) {
            String nestedProperty = propertyPath.substring(0, pos);
            String nestedPath = propertyPath.substring(pos + 1);
            PropertyDescriptor propertyDescriptor = BeanUtils.getPropertyDescriptor(propertyType, nestedProperty);

            return getPropertyDescriptorForPropertyPath(nestedPath, propertyDescriptor.getPropertyType());
        } else {
            return BeanUtils.getPropertyDescriptor(propertyType, propertyPath);
        }
    }
PropertyDescriptor getPropertyDescriptorForPropertyPath ( String propertyPath , Class < ? > propertyType ) { int pos = PropertyAccessorUtils . getFirstNestedPropertySeparatorIndex ( propertyPath ) ; // Handle nested properties recursively. if ( pos > - 1 ) { String nestedProperty = propertyPath . substring ( 0 , pos ) ; String nestedPath = propertyPath . substring ( pos + 1 ) ; PropertyDescriptor propertyDescriptor = BeanUtils . getPropertyDescriptor ( propertyType , nestedProperty ) ; //            BeanWrapperImpl nestedBw = getNestedBeanWrapper(nestedProperty); return getPropertyDescriptorForPropertyPath ( nestedPath , propertyDescriptor . getPropertyType ( ) ) ; } else { return BeanUtils . getPropertyDescriptor ( propertyType , propertyPath ) ; } }
Recursively navigate to return a BeanWrapper for the nested property path.

@param propertyPath
property property path, which may be nested
@return a BeanWrapper for the target bean
Recursively navigate to return a BeanWrapper for the nested property path .