Time for action – adding Spring validation

If you have a constraint that doesn't allow anyone to add more than 99 units of any product if the unit price is greater than 1000 USD for that product, add such a validation using Spring validation in the project. Perform the following steps:

1. Create a class called UnitsInStockValidator under the com.packt.webstore.validator package in the source folder src/main/java. Add the following code into it:

   package com.packt.webstore.validator;
   
   import java.math.BigDecimal;
   import org.springframework.stereotype.Component;
   import org.springframework.validation.Errors;
   import org.springframework.validation.Validator;
   import com.packt.webstore.domain.Product;
   
   @Component
   public class UnitsInStockValidator implements Validator{
   
     public boolean supports(Class<?> clazz) {
       return Product.class.isAssignableFrom(clazz);  
     }
   
     public void validate(Object target, Errors errors) {
       Product product = (Product) target;
   
       if(product.getUnitPrice()!...