Input Json Model Validation using Jackson and Gson

      

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
import com.google.gson.JsonIOException;

public class JsonValidator {
 
 
 public static void main(String[] args) throws JsonIOException, IOException {
  
  ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
         Validator validator = factory.getValidator();
         ObjectMapper objectMapper = new ObjectMapper(new YAMLFactory());
         List jsonObjString = new ArrayList();
         jsonObjString.add("postBox: Mumbai " );
        
         for(String attribute  : jsonObjString){
             System.out.println("Attribute :\n" + attribute);
             Address user = null;
             try {
                 user = objectMapper.readValue(attribute, Address.class);
             } catch (IOException e) {
               System.out.println("Exception caught:");
             }
             if (user != null) {
                 final Set> violations = validator.validate(user);
                 if (violations.size() > 0) {
                     System.out.println("Config contains errors:");
                     for (ConstraintViolation

                                                       u : violations){
                          System.out.println("  \"" + u.getPropertyPath().toString() + "\"" + " " + u.getMessage());
                     }
         
                 } else {
                     System.out.println("NO ERRORS " );
                 }
           
             }
         };
  }
}



/// ADD a model class of Address to test the validation and the messages returned for the 


import org.hibernate.validator.constraints.NotEmpty;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.sun.istack.internal.NotNull;

/**
 * Author : Sanal Samuel 
 * 
 */
@JsonInclude(JsonInclude.Include.NON_NULL)
public class Address {
 
 
 
 @NotNull
 @NotEmpty(message="Incorrect Data")
 private String postBox;
 
 @NotNull
 @NotEmpty(message="Incorrect Data")
 private String flatNumber;
 
 public String getPostBox() {
  return postBox;
 }
 public void setPostBox(String postBox) {
  this.postBox = postBox;
 }
 public String getFlatNumber() {
  return flatNumber;
 }
 public void setFlatNumber(String flatNumber) {
  this.flatNumber = flatNumber;
 }


 
 
}