javax.validation

Class Validation

java.lang.Object

javax.validation.Validation

public class Validation
extends Object

This class is the entry point for Bean Validation.

There are three ways to bootstrap it:

• The easiest approach is to build the default ValidatorFactory.

   ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
   

  In this case, the default validation provider resolver will be used to locate available providers.

  The chosen provider is defined as followed:

  • if the XML configuration defines a provider, this provider is used
  • if the XML configuration does not define a provider or if no XML configuration is present the first provider returned by the ValidationProviderResolver instance is used.
• The second bootstrap approach allows to choose a custom ValidationProviderResolver. The chosen ValidationProvider is then determined in the same way as in the default bootstrapping case (see above).

   Configuration<?> configuration = Validation
      .byDefaultProvider()
      .providerResolver( new MyResolverStrategy() )
      .configure();
   ValidatorFactory factory = configuration.buildValidatorFactory();
   

• The third approach allows you to specify explicitly and in a type safe fashion the expected provider.

  Optionally you can choose a custom ValidationProviderResolver.

   ACMEConfiguration configuration = Validation
      .byProvider(ACMEProvider.class)
      .providerResolver( new MyResolverStrategy() )  // optionally set the provider resolver
      .configure();
   ValidatorFactory factory = configuration.buildValidatorFactory();
   

Note:

• The ValidatorFactory object built by the bootstrap process should be cached and shared amongst Validator consumers.
• This class is thread-safe.

Author:

Emmanuel Bernard, Hardy Ferentschik

Constructor Summary

Constructors

Constructor and Description
Validation()

Method Summary

Modifier and Type	Method and Description
static ValidatorFactory	buildDefaultValidatorFactory() Builds and returns a ValidatorFactory instance based on the default Bean Validation provider and following the XML configuration.
static GenericBootstrap	byDefaultProvider() Builds a Configuration.
static <T extends Configuration<T>,U extends ValidationProvider<T>> ProviderSpecificBootstrap<T>	byProvider(Class<U> providerType) Builds a Configuration for a particular provider implementation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Validation

public Validation()

Method Detail

buildDefaultValidatorFactory

public static ValidatorFactory buildDefaultValidatorFactory()

Builds and returns a ValidatorFactory instance based on the default Bean Validation provider and following the XML configuration.

The provider list is resolved using the default validation provider resolver logic.

The code is semantically equivalent to Validation.byDefaultProvider().configure().buildValidatorFactory().

Returns:

ValidatorFactory instance

Throws:

NoProviderFoundException - if no Bean Validation provider was found

ValidationException - if a Bean Validation provider was found but the ValidatorFactory cannot be built

byDefaultProvider

public static GenericBootstrap byDefaultProvider()

Builds a Configuration. The provider list is resolved using the strategy provided to the bootstrap state.

 Configuration<?> configuration = Validation
    .byDefaultProvider()
    .providerResolver( new MyResolverStrategy() )
    .configure();
 ValidatorFactory factory = configuration.buildValidatorFactory();
 

The provider can be specified in the XML configuration. If the XML configuration does not exist or if no provider is specified, the first available provider will be returned.

Returns:

instance building a generic Configuration compliant with the bootstrap state provided

byProvider

public static <T extends Configuration<T>,U extends ValidationProvider<T>> ProviderSpecificBootstrap<T> byProvider(Class<U> providerType)

Builds a Configuration for a particular provider implementation.

Optionally overrides the provider resolution strategy used to determine the provider.

Used by applications targeting a specific provider programmatically.

 ACMEConfiguration configuration =
     Validation.byProvider(ACMEProvider.class)
             .providerResolver( new MyResolverStrategy() )
             .configure();
 

, where ACMEConfiguration is the Configuration sub interface uniquely identifying the ACME Bean Validation provider. and ACMEProvider is the ValidationProvider implementation of the ACME provider.

Type Parameters:

T - the type of the Configuration corresponding to this ValidationProvider

U - the type of the ValidationProvider implementation

Parameters:

providerType - the ValidationProvider implementation type

Returns:

instance building a provider specific Configuration sub interface implementation