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Difference between revisions of "Bean Validation Cheat Sheet"

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= Introduction =
 
= Introduction =

Revision as of 01:18, 8 June 2016

Bean validation jsr.jpg

Bean validation typical.jpg

Introduction

This article is focused on providing clear, simple, actionable guidance for providing Java Bean Validation security functionality in your applications.

Bean validation (JSR303 aka Bean Validation 1.0 /JSR349 aka Bean Validaiton 1.1) is one of the most common ways to perform input validation in Java. It is an application layer agnostic validation spec which provides the developer with the means to define a set of validation constraints on a domain model and then perform validation of those constraints through out the various application tiers.

One advantage of this approach is that the validation constraints and the corresponding validators are only written once, thus reducing duplication of effort and ensuring uniformity:

Typical validation:

Image placeholder

Bean Validation:

Image placeholder


Setup

The examples in this guide use Hibernate Validator (the reference implementation for Bean Validation 1.1).

Add Hibernate Validator to your pom.xml :

  <dependency>
     <groupId>org.hibernate</groupId>
     <artifactId>hibernate-validator</artifactId>
     <version>5.2.4.Final</version>
  </dependency>


Enable bean validation support in Spring's context.xml

  <beans:beans ...
  ...
  <mvc:annotation-driven />
  ...
  </beans:beans>

For more info, please see the setup guide


Basics

In order to get started using Bean Validation, you must add validation constraints (@Pattern, @Digits, @Min, @Max, @Size, @Past, @Future, @CreditCardNumber, @Email, @URL, etc.) to your model and then utilize the @Valid annotation when passing your model around in various application layers.

Constraints can be applied in several places:

  • Fields
  • Properties
  • Classes

For the sake of simplicity all the examples below feature field constraints and all validation is triggered by the controller. Refer to the Bean Validation documentation for a full list of examples.

When it comes to error handling, the Hibernate Validator returns a BindingResult object which contains a List<ObjectError>. The examples below feature simplistic error handling, while a production ready application would have a more elaborate design that takes care of logging and error page redirection.


Pre-defined Constraints


@Pattern


Model

  import org.hibernate.validator.constraints.Pattern
  
  public class Article {
  
  	   //Constraint: Alpha Numeric article titles only
  	   //https://www.owasp.org/index.php/OWASP_Validation_Regex_Repository for useful regex's
  	   
  	   @Pattern(regexp = "[a-zA-Z0-9 .-]+$]")
  	   private String articleTitle;
     
  	   public String getArticleTitle() {
  	      	return articleTitle;
  	   }
  
  	   public void setArticleTitle(String articleTitle) {
  		   this.articleTitle = articleTitle;
  	   }	   
  	   
  	   ...
  	   
  }


Controller

  import javax.validation.Valid;
  import com.company.app.model.Article;
  
  @Controller
  public class ArticleController {
  
  ...
  
  @RequestMapping(value={"/postArticle", method={RequestMethod.POST})
  	public @ResponseBody String postArticle(@Valid Article article, BindingResult result, HttpServletResponse response){
  		
   		if(result.hasErrors()){
   			String errorMessage = "";
  			response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
  			List<ObjectError> errors = result.getAllErrors();
  			
  			for( ObjectError e : errors){
  				errorMessage+= "ERROR: " + e.getDefaultMessage();
  			}
  			return errorMessage;
   		}
  			
   		else{
  			   return "Validation Successful"; 	
  		}
      }
  }


@Digits


Model

  import org.hibernate.validator.constraints.Digits
  
  public class Customer {
  	
       //Constraint: Age can only be 3 digits long or less
  	@Digits(integer=3, fraction=0)
  	private int age;
  
  	   public String getAge() {
  		   return age;
  	   }
  
  	   public void setAge(String age) {
  		   this.age = age;
  	   }
  	   
  	   ...
  }


Controller

  import javax.validation.Valid;
  import com.company.app.model.Customer;
  
  @Controller
  public class CustomerController {
  
  ...
  
  @RequestMapping(value={"/registerCustomer", method={RequestMethod.POST})
  	   public @ResponseBody String registerCustomer(@Valid Customer customer, BindingResult result, HttpServletResponse response){
  		
   		if(result.hasErrors()){
   			String errorMessage = "";
  			response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
  			List<ObjectError> errors = result.getAllErrors();
  			
  			for( ObjectError e : errors){
  				errorMessage+= "ERROR: " + e.getDefaultMessage();
  			}
  			return errorMessage;
   		}
  			
   		else{
  			   return "Validation Successful"; 	
  		}
      }
  }

@Min / @Max


Model

  import org.hibernate.validator.constraints.Min
  import org.hibernate.validator.constraints.Max
  
  public class Review {
  	
       //Constraint: Review rating must be between 1 and 5
     	@Min(1)
     	@Max(5)
     	private int reviewRating;
  
     	public int getReviewRating() {
     		return reviewRating;
     	}
  
     	public void setReviewRating(int reviewRating) {
     		this.reviewRating = reviewRating;
  	   }
  	
  	...
  }


Controller

  import javax.validation.Valid;
  import com.company.app.model.ReviewRating;
  
  @Controller
  public class ReviewController {
  
  ...
  
  @RequestMapping(value={"/postReview", method={RequestMethod.POST})
     	public @ResponseBody String postReview(@Valid Review review, BindingResult result, HttpServletResponse response){
  		
   		if(result.hasErrors()){
   			String errorMessage = "";
  			response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
  			List<ObjectError> errors = result.getAllErrors();
  			
  			for( ObjectError e : errors){
  				errorMessage+= "ERROR: " + e.getDefaultMessage();
  			}
  			return errorMessage;
   		}
  			
   		else{
  			   return "Validation Successful"; 	
  		}
      }
  }

@Size


Model

  import org.hibernate.validator.constraints.Size
  
  public class Message {
  	   
          //Constraint: Message must be at least 10 characters long, but less than 500
  	   @Size(min=10, max=500)
  	   private String message;
  
  	   public String getMessage() {
  		   return message;
  	   }
  
  	   public void setMessage(String message) {
  		   this.message = message;
  	   }
  	   
  	   ...
  }


Controller

  import javax.validation.Valid;
  import com.company.app.model.Message;
  
  @Controller
  public class MessageController {
  
  ...
  
  @RequestMapping(value={"/sendMessage", method={RequestMethod.POST})
     	public @ResponseBody String sendMessage(@Valid Message message, BindingResult result, HttpServletResponse response){	
  		
   		if(result.hasErrors()){
   			String errorMessage = "";
  			response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
  			List<ObjectError> errors = result.getAllErrors();
  			
  			for( ObjectError e : errors){
  				errorMessage+= "ERROR: " + e.getDefaultMessage();
  			}
  			return errorMessage;
   		}
  			
   		else{
  			   return "Validation Successful"; 	
  		}
      }
  }

@Past / @Future


Model

  import org.hibernate.validator.constraints.Past
  import org.hibernate.validator.constraints.Future
  
  public class DoctorVisit {
  	
       //Constraint: Birthdate must be in the past
     	@Past
     	private Date birthDate;
  
     	public Date getBirthDate() {
     		return birthDate;
     	}
     
     	public void setBirthDate(Date birthDate) {
     		this.birthDate = birthDate;
     	}
  	
       //Constraint: Schedule visit date must be in the future
     	@Future
     	private String scheduledVisitDate;
  
     	public String getScheduledVisitDate() {
     		return scheduledVisitDate;
     	}
  
     	public void setScheduledVisitDate(String scheduledVisitDate) {
     		this.scheduledVisitDate = scheduledVisitDate;
     	}
     	
  	...
  }
  

Controller

  import javax.validation.Valid;
  import com.company.app.model.DoctorVisit;
  
  @Controller
  public class DoctorVisitController {
  
  ...
  
  @RequestMapping(value={"/scheduleVisit", method={RequestMethod.POST})
     	public @ResponseBody String scheduleVisit(@Valid DoctorVisit doctorvisit, BindingResult result, HttpServletResponse response){
  		
   		if(result.hasErrors()){
   			String errorMessage = "";
  			response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
  			List<ObjectError> errors = result.getAllErrors();
  			
  			for( ObjectError e : errors){
  				errorMessage+= "ERROR: " + e.getDefaultMessage();
  			}
  			return errorMessage;
   		}
  			
   		else{
  			   return "Validation Successful"; 	
  		}
      }
  }

Additional Constraints

In addition to providing the complete set of JSR303 constraints, Hibernate Validator also defines some additional constraints for convenience:

  • @CreditCardNumber
  • @EAN
  • @Email
  • @Length
  • @Range
  • @SafeHtml
  • @ScriptAssert
  • @URL

http://docs.jboss.org/hibernate/validator/5.2/reference/en-US/html/ch02.html#table-custom-constraints

Custom Constraints

One of the most powerful features of bean validation is the ability to define your own constraints that go beyond the simple validation offered by built in constraints.

Creating custom constraints is beyond the scope of this guide. Please see http://docs.jboss.org/hibernate/validator/5.2/reference/en-US/html/ch06.html