Estoy escribiendo una aplicación web usando Jersey 2.22.1 y Jackson 2.6.3. Mi pom.xml se ve así:

<!-- JERSEY -->
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-servlet</artifactId>
        <version>2.22.1</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.core</groupId>
        <artifactId>jersey-client</artifactId>
        <version>2.22.1</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-json-jackson</artifactId>
        <version>2.22.1</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-multipart</artifactId>
        <version>2.22.1</version>
    </dependency>
    <dependency>
        <groupId>asm</groupId>
        <artifactId>asm</artifactId>
        <version>3.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.codehaus.woodstox</groupId>
        <artifactId>woodstox-core-asl</artifactId>
        <version>4.4.1</version>
    </dependency>
    <!-- JACKSON -->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.6.3</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.6.3</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-annotations</artifactId>
        <version>2.6.3</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.dataformat</groupId>
        <artifactId>jackson-dataformat-xml</artifactId>
        <version>2.6.3</version>
    </dependency>

El objetivo es utilizar diferentes ObjectMappers personalizados para mapeo JSON y XML. He creado dos clases de proveedor: JSONMapperProvider

    @Provider
    @Produces(MediaType.APPLICATION_JSON)
    public class JSONMapperProvider implements ContextResolver<ObjectMapper> {
    private static ObjectMapper objectMapper;

    public JSONMapperProvider() {
    init();
    }

    public static void init() {
    if (objectMapper == null) {
        objectMapper = new ObjectMapper();
        // SERIALIZATION
        objectMapper.configure(SerializationFeature.INDENT_OUTPUT, true)
            .configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false)
            .configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false)
            .configure(SerializationFeature.WRITE_DATE_KEYS_AS_TIMESTAMPS, false)
            .setSerializationInclusion(Include.NON_NULL)
            .setSerializationInclusion(Include.NON_EMPTY);
        // DESERIALIZATION
        objectMapper.configure(DeserializationFeature.USE_BIG_DECIMAL_FOR_FLOATS, true)
            .configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true);
        // set up ISO 8601 date/time stamp format:
        ObjectMapperProvider.DATE_FORMAT_ISO8601.setTimeZone(TimeZone.getTimeZone("GMT"));
        objectMapper.setDateFormat(ObjectMapperProvider.DATE_FORMAT_ISO8601);
        // Custom deserializer for date which helps deserialization of date
        // without time
        SimpleModule dateDeserializerModule = new SimpleModule("DateDeserializerModule", Version.unknownVersion());
        dateDeserializerModule.addDeserializer(Date.class, new CustomJsonDateDeserializer());
        //objectMapper.registerModule(dateDeserializerModule);
    }
    }

    @Override
    public ObjectMapper getContext(Class<?> type) {
    System.out.println("JSONMapperProvider.getContext() called with type: "
        + type);
    return objectMapper;
    }

    private static class CustomJsonDateDeserializer extends JsonDeserializer<Date> {
    @Override
    public Date deserialize(JsonParser jsonparser, DeserializationContext deserializationcontext) throws IOException, JsonProcessingException {
        String date = jsonparser.getText();
        try {
        return DateUtil.parseDate(date);
        } catch (ParseException e) {
        throw new RuntimeException(e);
        }
    }
    }
}

y XMLMapperProvider

    @Provider
    @Produces({ MediaType.APPLICATION_XML })
    public class XMLMapperProvider implements ContextResolver<ObjectMapper>     {

    private static ObjectMapper objectMapper;

    public XMLMapperProvider() {
    init();
    }

    public static void init() {
    if (objectMapper == null) {
        JacksonXmlModule module = new JacksonXmlModule();
        module.setDefaultUseWrapper(false);
        objectMapper = new XmlMapper(module);
        // SERIALIZATION
        objectMapper.configure(SerializationFeature.INDENT_OUTPUT, true)
            .configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false)
            .configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false)
            .configure(SerializationFeature.WRITE_DATE_KEYS_AS_TIMESTAMPS, false)
            .setSerializationInclusion(Include.NON_NULL)
            .setSerializationInclusion(Include.NON_EMPTY);
        // DESERIALIZATION
        objectMapper.configure(DeserializationFeature.USE_BIG_DECIMAL_FOR_FLOATS, true)
            .configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true);
        // set up ISO 8601 date/time stamp format:
        ObjectMapperProvider.DATE_FORMAT_ISO8601.setTimeZone(TimeZone.getTimeZone("GMT"));
        objectMapper.setDateFormat(ObjectMapperProvider.DATE_FORMAT_ISO8601);
        // Custom deserializer for date which helps deserialization of date
        // without time
        SimpleModule dateDeserializerModule = new SimpleModule("DateDeserializerModule", Version.unknownVersion());
        dateDeserializerModule.addDeserializer(Date.class, new CustomJsonDateDeserializer());
        objectMapper.registerModule(dateDeserializerModule);
    }
    }

    @Override
    public ObjectMapper getContext(Class<?> type) {
    System.out.println("XMLMapperProvider.getContext() called with type: "
        + type);
    return objectMapper;
    }

    private static class CustomJsonDateDeserializer extends JsonDeserializer<Date> {
    @Override
    public Date deserialize(JsonParser jsonparser, DeserializationContext deserializationcontext) throws IOException, JsonProcessingException {
        String date = jsonparser.getText();
        try {
        return DateUtil.parseDate(date);
        } catch (ParseException e) {
        throw new RuntimeException(e);
        }
    }
    }
}

Ambos están en el mismo paquete que está registrado en la clase de recurso Aplicación

@ApplicationPath("resources")
public class CCRestResources extends ResourceConfig {
    public CCRestResources() {
        register(JacksonFeature.class);
        packages("com.cc.rest.jersey");
    }
}

Si hago una solicitud GET al método que @Produces (MediaType.APPLICATION_JSON) todo está bien y se usa mi mapeador personalizado. Pero si hago la misma solicitud para emthod que la aplicación @Produces (MediaType.APPLICATION_XML) use algún mapeador predeterminado, no el personalizado. Por favor ayuda si tienes alguna idea. ¡Gracias!