What’s New with Bean Validation in Java EE 7

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What’s New with Bean Validation in Java EE 7Reza RahmanJava EE/GlassFish [email protected]@reza_rahman


Bean Validation 1.1

Point release update to Java EE 6 Small but important set of changes aligned with the platform Integration with CDI, JAX-RS, JPA, JSF, etc

Overview


Bean Validation 1.1

CDI alignment Method validation Integration with JAX-RS Error messages using EL expressions

Feature Summary


Bean Validation 1.1

Delegate Bean Validation component lifecycle to CDI Particularly useful in ConstraintValidator implementations

CDI Alignment

public class ZipCodeValidator implements ConstraintValidator<ZipCode, String> { @Inject @France private ZipCodeChecker checker;

public void initialize(ZipCode zipCode) {} public boolean isValid(String value, ConstraintValidationContext context) { if (value==null) return true; return checker.isZipCodeValid(zipCode); }}


Bean Validation 1.1

Validate parameters and return values upon invocation– Methods and constructors

Ideal for business methods

Method Validation Overview


Bean Validation 1.1Method Validation Example

@RequestScope public class Client { @Inject AccountService service; public void createClient() { service.createUser(...); }}

@ApplicationScoped public class AccountService { @NotNull public User createUser( @NotEmpty String username, String firstname, String lastname, @Valid Address home, @NotNull @Email String email, @Past Date birthDate) { // parameters are validated and an exception // is raised upon failure // business }}


Bean Validation 1.1

Offer resource validation– Using Bean Validation constraints

Exactly like method validation

Integration with JAX-RS

@Path(“/user”)public class UserResource {

@Post @Consumes("application/x-www-form-urlencoded") public void register( @NotEmpty @FormParam(“firstname”) String firstname, @NotEmpty @FormParam(“lastname”) String lastname, @NotNull @Email @FormParam(“email”) String email) { ... }

// Works on fields and getters too}


Bean Validation 1.1

Ability to use EL inside error messages Access to constraint parameters and invalid value Offer localized string formatting too

Error messages using Expression Language

javax.validation.constraints.DecimalMax.message=\ must be less than ${inclusive == true ? 'or equal to ' : ''}{value}


Summary

BV 1.1 brings important changes Both from a Java EE 7 and ecosystem perspective Try the APIs out, provide your feedback and get involved


Resources

Bean Validation project page– http://beanvalidation.org

Glassfish 4– https://glassfish.java.net/

What’s New with Bean Validation in Java EE 7

Technology

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