CDI injectionpoint?@httpparam??

Question

?????doc

?????4.11?

? InjectionPoint??????

HTTP????????????????????????????

CDI?????????

???????NetBeans????????????????????????????????????????

org.jboss.weld.exceptions.DeploymentException:????

??001408?????????????????????:java.lang.String?com.test.HttpParamProducer.getParamValue(javax.enterprise.inject.spi.InjectionPoint?javax.servlet.ServletRequest)??????1????:[@ javax.enterprise.inject.Default()]

????????????????????

public class HttpParamProducer {

   @HttpParam("")
   @Produces
   String getParamValue(
           InjectionPoint ip, ServletRequest request) {

      return request.getParameter(ip.getAnnotated().getAnnotation(HttpParam.class).value());

   }
}

Answer 1

2????????????

???????????? ???????

????HttpServletRequest??????????????????CDI????????

????? ???

??????????????

@WebListener 
public class HttpServletRequestProducer implements ServletRequestListener {
    private final static ThreadLocal<HttpServletRequest> holder = new ThreadLocal<HttpServletRequest>();

    @Override
    public void requestDestroyed(ServletRequestEvent sre) {
        holder.remove();
    }

    @Override
    public void requestInitialized(ServletRequestEvent sre) {
        holder.set((HttpServletRequest)sre.getServletRequest());
    }

    @Produces @RequestScoped HttpServletRequest get() {
        return holder.get();
    }
}

?@Inject?HttpServletRequest?????????????

?????????

Answer 2

????????????????????????????(??????)???????????????????????API??ServletRequest???????