RestEasy - Parameters Binding - Validation and Errors - EJB

问题

Lets say I define a POJO with parameters that is passed to a REST call

 class MyVO {
    @NotNull
    @PathParam("name")
    private String name;

    @NotNull
    @PathParam("age")
    private Integer age;
    // getters and setters
 }

 public class RESTclass {
   public postData( @Form MyVO vo ) {
   }
 }

It automatically binds the objects in MyVO. But where do I get the validation errors? Does it trigger the validation during binding? If not, how to trigger the validations?

Spring does all these well. It has BindingResult parameter that you can inject. What is the equivalent here?

Any idea?

回答1:

RestEasy Versions Prior to 3.0.1.Final

For bean validation 1.0, Resteasy has a custom validation provider that uses hibernate's bean validator implementation under the covers.

In order to get validation up and running in Resteasy you need to do the following:

Add the resteasy-hibernatevalidator-provider dependency to your project. Here is the maven pom entry if you are using maven:

<dependency>
    <groupId>org.jboss.resteasy</groupId>
    <artifactId>resteasy-hibernatevalidator-provider</artifactId>
    <version>${resteasy.version}</version>
</dependency>

Annotate your resource classes where you want validation to occur with the @ValidateRequest annotation.

@Named 
@Path("/users") 
@ValidateRequest 
public class UserResource extends BaseResource 
{   
    @POST
    @Consumes({MediaType.APPLICATION_JSON})
    @Produces({MediaType.APPLICATION_JSON})
    public Response createUser(@Valid User user)
    {
        //Do Something Here
    }
}

Resteasy will automatically detect the HibernateValidatorAdapter on the classpath and begin invoking bean validation.

Create an ExceptionMapper<MethodConstraintViolationException> implementation to handle the validation errors.

Unlike in Spring where you have to check the BindingResult, when validation errors are encountered in Resteasy the hibernate validator will throw a MethodConstraintViolationException. The MethodConstraintViolationException will contain all of the validation errors within it.
```
@Provider
public class MethodConstraintViolationExceptionMapper extends MyBaseExceptionMapper
        implements ExceptionMapper<MethodConstraintViolationException>
{
    @Override
    public Response toResponse(MethodConstraintViolationException exception) 
    {
        //Do Something with the errors here and create a response.
    }
}
```

RestEasy Version 3.0.1.Final

The latest version of Resteasy is now supporting bean validation spec 1.1 and has changed the api and exceptions thrown.

Instead of the resteasy-hibernatevalidator-provider you are going to need the resteasy-validator-provider-11 dependency.
You will not need to add @ValidateRequest to your resource classes as validation testing is turned on by default with resteasy-validator-provider-11.
Instead of throwing a MethodConstraintViolationException when violations are detected, an instance of RESTEasyViolationException will be thrown.

Documentation: 3.0.1.Final Validation Documentation

来源：https://stackoverflow.com/questions/17435544/resteasy-parameters-binding-validation-and-errors-ejb

标签

java

binding

error-handling

ejb

resteasy