Bean validation via Hibernate Validator.
Validator,HibernateValidatorConfiguration- Parser
<dependency>
<groupId>org.jooby</groupId>
<artifactId>jooby-hbv</artifactId>
<version>1.5.0</version>
</dependency>{
use(new Hbv());
get("/", req -> {
Validator validator = require(Validator.class);
Car car = req.params().to(Car.class);
Set<ConstraintViolation> violations = validator.validate(car);
if (violations.size() > 0) {
// handle errors
...
}
});
}Previous example demonstrate how to manually validate a bean created via: req.params() or req.body(). The boilerplate code
can be avoided if you explicitly tell the validation module which classes require validation.
The previous example can be rewritten as:
{
use(new Hbv(Car.class));
get("/", () -> {
Car car = req.params().to(Car.class);
// a valid car is here
...
});
}Here a Parser will do the boilerplate part and throws a ConstraintViolationException.
The default err handler will render the ConstraintViolationException without problem, but suppose we have a JavaScript client and want to display the errors in a friendly way.
{
use(new Jackson()); // JSON renderer
use(new Hbv(Car.class)); // Validate Car objects
err((req, rsp, err) -> {
Throwable cause = err.getCause();
if (cause instanceof ConstraintViolationException) {
Set<ConstraintViolation<?>> constraints = ((ConstraintViolationException) cause)
.getConstraintViolations();
Map<Path, String> errors = constraints.stream()
.collect(
Collectors.toMap(
ConstraintViolation::getPropertyPath,
ConstraintViolation::getMessage
)
);
rsp.send(errors);
}
});
get("/", () -> {
Car car = req.params().to(Car.class);
// a valid car is here
...
});
}The call to rsp.send(errors); will be rendered by Jackson (or any other that applies) and will produces a more friendly response, here it will be a JavaScript object with the errors.
ConstraintValidatorFactory is the extension point for customizing how constraint validators are instantiated and released.
In Jooby, a ConstraintValidatorFactory is powered by Guice and java.io.Closeable constraint will be release it. See ConstraintValidatorFactory
Any property defined at hibernate.validator will be add it automatically:
application.conf
hibernate.validator.fail_fast = true
Or programmatically:
{
use(new Hbv().doWith(config -> {
config.failFast(true);
}));
}