JSR-303 Bean Validation Emmanuel Bernard JBoss, by Red Hat http://in.relation.to/Bloggers/Emmanuel
Copyright 2007-2010 Emmanuel Bernard and Red Hat Inc. mardi 6 avril 2010
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Enable declarative validation in your applications Constrain Once,Validate Anywhere
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Emmanuel Bernard • Hibernate Search in Action • blog.emmanuelbernard.com • twitter.com/emmanuelbernard • http://lescastcodeurs.com
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Constraints • Constraint • restriction on a bean, field or property • not null, between 10 and 45, valid email... • How is that useful • give feedback to the user • ensure that a service will behave correctly • define service range of usability • avoid adding crap to the database • unless you like fixing the data manually mardi 6 avril 2010
Constraints in Java Ecosystems • Where should they be applied?
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Constraints in the Java Ecosystem Java Client Side
Presentation Layer
Business Layer
Data Access Layer
• How many models do you have? • ONE mardi 6 avril 2010
Database
What is the solution? • Uniform way to express a constraint • everybody speaks the same language • based on the domain model (JavaBeans™) • Standard way to validate constraints • one runtime engine • same validation implementations shared • Bridge for constraints out of Java™ land • API to access the constraint repository mardi 6 avril 2010
Declare a constraint public class Address { @NotNull @Size(max=30, message="longer than {max} characters") private String street1; ... @NotNull @Valid private Country country; } public class Country { @NotNull @Size(max=30) private String name; ... }
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Groups • Subset of constraints • Partial validation • screen of a wizard UI • Constraints applied in a given use case • Order constraint validations • which depends on other validations • when a constraint is resource/time intensive mardi 6 avril 2010
interface Billable {} interface BuyInOneClick extends Billable, Default {} class User { @NotNull(groups=BuyInOneClick.class) PaymentMethod getDefaultCreditCard() {...}
}
@NotNull //Default group String getUserName() {...}
Message • Can be externalized • Internationalization • Interpolate constraint parameters • must be shorter than {min} • Custom MessageInterpolator strategy • Useful for application frameworks • Contextual data • Locale mardi 6 avril 2010
How to use Bean Validation • Standalone • JPA 2.0 • JSF 2.0 • EE 6
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Bootstrap API • extensible • support multiple implementations • type-safe • can override some attributes contextually • XML configuration optional • META-INF/validation.xml mardi 6 avril 2010
Manual validation • Get a Validator from a ValidatorFactory Set> errors = validator.validate(user); Set> errors = validator.validate(user, BuyInOneClick.class);
• ConstraintViolation • error message / message template • invalid value • context mardi 6 avril 2010
JSF 2 integration • Zero conf • Validate input components • find property via Expression Language • call Bean Validation on input value • return localized error messages • use JSF user Locale • custom MessageInterpolator mardi 6 avril 2010
Java Persistence 2 • On entity change • validation • can select the groups validated • Make use of a custom TraversableResolver • do not traverse associations mardi 6 avril 2010
Java EE 6 • Validator as an injectable resource @Resource Validator validator; //or @Resource ValidatorFactory vf;
in CDI (Java Context and Dependency • Or Injection) @Inject Validator validator; //or @Inject ValidatorFactory vf;
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Bean Validation • Status. It’s done.
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Hibernate Validator 4 • Released too. 4.0.2 • What are you waiting for? • Road Map compatible with legacy Hibernate • backward Validator usage • some cool ideas out of the spec scope • License • ASL 2.0 mardi 6 avril 2010
Questions? Or not? • JCP.org • search “303” • http://in.relation.to • “bean validation” tag • Hibernate Validator • http://validator.hibernate.org • http://forum.hibernate.org/viewforum.php?f=26 mardi 6 avril 2010
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