ExceptionMapper提供程序不适用于球衣

Question

I'm doing a Webservice in java using Jersey. my dependencies for jersey are:

/* JAX-RS Impl (Jersey) */
compile 'org.glassfish.jersey.inject:jersey-hk2:2.27'
compile 'org.glassfish.jersey.containers:jersey-container-servlet:2.27'
compile 'org.glassfish.jersey.media:jersey-media-sse:2.27'
compile 'org.glassfish.jersey.core:jersey-server:2.27'

//Jackson implementation 
compile 'org.glassfish.jersey.media:jersey-media-json-jackson:2.27'

// Hateoas
compile 'org.glassfish.jersey.ext:jersey-declarative-linking:2.27'

//Jersey Impl test
compile 'org.glassfish.jersey.test-framework:jersey-test-framework-core:2.27'

compileOnly 'javax.servlet:javax.servlet-api:4.0.1'

My class Exception looks like the next snippet, I'm catching all Throwable to test this works.

package com.apporelbotna.appuestas.rest.exception;

import javax.ws.rs.core.Response;
import javax.ws.rs.ext.ExceptionMapper;
import javax.ws.rs.ext.Provider;

@Provider
public class WebserviceExceptionMapper implements ExceptionMapper<Throwable>
{
    public WebserviceExceptionMapper()
    {
        System.out.println("I'm getting created!!! - WebserviceExceptionMapper");
    }

    public Response toResponse(Throwable ex)
    {
        return Response.status(404).build();
    }
}

And my rest Endpoint looks like:

@GET
public Response getUsers() throws Exception
{
    throw new Exception("Hi i'm crashing!");
}

I read the documentation of Jersey and i undestand that i can register the exception mappers using @provider in the class. But the application doesn't recognize the class. I tried to register my class in my ResourceConfig class. And this it works.

@Provider
@javax.ws.rs.ApplicationPath("webservice")
public class RestResourceConfig extends ResourceConfig
{
    @Context
    public void setServletContext(ServletContext context)
    {
        if (context != null)
        {
            context.getInitParameter("system.info.allow");
        }
    }

    public RestResourceConfig()
    {
        // Register components in a package
        register(WebserviceExceptionMapper.class);
        packages("com.apporelbotna.appuestas.rest.endpoint");
    }
}

What i'm missing?

Answer 1

packages("com.apporelbotna.appuestas.rest.endpoint") This tells Jersey which package(s) to scan for @Provider and @Path classes and register them. You can list multiple packages or you can just use a base package like com.apporelbotna.appuestas and Jersey will scan the package recursively.

So if you want your ExceptionMapper to be registered automatically, do one of the following

packages("com.apporelbotna.appuestas.rest.endpoint",
         "com.apporelbotna.appuestas.rest.exception");
// -or-
packages("com.apporelbotna.appuestas.rest");