在Jackson Serializer中没有解决CDI注入问题

我正在尝试在Jackson的 JsonSerializer<> 中注入一个 @RequestScoped 对象类：

I'm trying to inject a @RequestScoped object class in a Jackson's JsonSerializer<>:

public class DigitalInputSerializer extends JsonSerializer<DigitalInput>
{
    @Inject private UserRequestResources user;

    @Override
    public void serialize(DigitalInput value, JsonGenerator gen,
            SerializerProvider serializers) throws IOException,
            JsonProcessingException {

        gen.writeStartObject();
        gen.writeStringField("user", this.user.getMe().getUser());

在最后一行， this.user 是 null 。

@RequestScoped
public class UserRequestResources
{

此对象类在项目的其他位置解析。
我正在使用Wildfly 8 J2EE实现。

This object class is resolved on whereever on other places of the project. I'm using Wildfly 8 J2EE implementation.

编辑：

我有一个配置jackson mapper的主要资源：

I've a main resource where I configure jackson mapper:

@ApplicationScoped
public class SerializationApplicationResources
{

  protected ObjectMapper mapper;

  @PostConstruct
  protected void initialize_resources() throws IllegalStateException
  {
    this.mapper = new ObjectMapper();

    SimpleModule module = new SimpleModule();

    module.addDeserializer(DigitalInput.class, new DigitalInputDeserializer());
    module.addSerializer(DigitalInput.class, new DigitalInputSerializer());

为了使用它，我只用 @Inject ，然后我有一个实例。

In order to use it, I only annotate my fields with @Inject, and then I've an instance of that.

@Inject protected SerializationApplicationResources jacksonResources;

那么，

this.jacksonResources.getMapper().writeValueAsBytes(entity);