Cannot use typesafe messages on Application scope initialization observer

Hi. I'm running into a problem when trying to use DS' typesafe messages in a observer method that runs upon initialization of the application scope.

Code (relevant methods only):

@Dependent
@MessageBundle
// (Messages.properties is has been set-up correctly)
public interface Messages {

String administrador();

}

@Dependent
public class StartupBean implements Serializable {

@Inject
private Messages msgs;

public void runOnStartup(@Observes @Initialized(ApplicationScoped.class) ServletContext payload)

{ this.log.info(this.msgs.administrador()); }

}

When the observer method is executed, I'm being presented with this stacktrace, and deployment of application is aborted:

23:56:34,238 SEVERE [faces] (FactoryFinderInstance.java:177) Unable to obtain InjectionProvider from init time FacesContext. Does this container implement the Mojarra Injection SPI?
23:56:34,239 SEVERE [faces] (FactoryFinderInstance.java:494) La aplicación no se ha inicializado correctamente durante el inicio, no se encuentra la fábrica: javax.faces.application.ApplicationFactory. Attempting to find backup.
23:56:34,239 ERROR [fail] (ServiceControllerImpl.java:1955) MSC000001: Failed to start service jboss.undertow.deployment.default-server.default-host./app: org.jboss.msc.service.StartException in service jboss.undertow.deployment.default-server.default-host./hg: Failed to start service
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1904) [jboss-msc-1.2.2.Final.jar:1.2.2.Final]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_77]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_77]
at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_77]
Caused by: java.lang.RuntimeException: java.lang.IllegalStateException: Could not find backup for factory javax.faces.application.ApplicationFactory.
at io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:222)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.startContext(UndertowDeploymentService.java:87)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.start(UndertowDeploymentService.java:72)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948) [jboss-msc-1.2.2.Final.jar:1.2.2.Final]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881) [jboss-msc-1.2.2.Final.jar:1.2.2.Final]
... 3 more
Caused by: java.lang.IllegalStateException: Could not find backup for factory javax.faces.application.ApplicationFactory.
at javax.faces.FactoryFinderInstance.getFactory(FactoryFinderInstance.java:500)
at javax.faces.FactoryFinder.getFactory(FactoryFinder.java:287)
at com.sun.faces.config.InitFacesContext.getApplication(InitFacesContext.java:142)
at org.apache.deltaspike.jsf.impl.message.JsfMessageResolver.getMessageSources(JsfMessageResolver.java:45)
at org.apache.deltaspike.core.impl.message.DefaultMessageResolver.getMessage(DefaultMessageResolver.java:52)
at org.apache.deltaspike.core.impl.message.DefaultMessage.toString(DefaultMessage.java:115)
at org.apache.deltaspike.core.impl.message.DefaultMessage.toString(DefaultMessage.java:95)
at org.apache.deltaspike.core.impl.message.MessageBundleInvocationHandler.invoke(MessageBundleInvocationHandler.java:123)
at com.sun.proxy.$Proxy1079.administrador(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.8.0_77]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [rt.jar:1.8.0_77]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_77]
at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_77]
at org.jboss.weld.bean.proxy.AbstractBeanInstance.invoke(AbstractBeanInstance.java:38)
at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:100)
at org.jboss.weld.proxies.Messages$Serializable$981322000$Proxy$_$$_WeldClientProxy.administrador(Unknown Source)
at com.app.core.StartupBean.runOnStartup(StartupBean.java:178)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.8.0_77]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [rt.jar:1.8.0_77]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_77]
at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_77]
at org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:90)
at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:271)
at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:258)
at org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:237)
at org.jboss.weld.event.FastEvent.fire(FastEvent.java:125)
at org.jboss.weld.servlet.HttpContextLifecycle.contextInitialized(HttpContextLifecycle.java:132)
at org.jboss.weld.servlet.WeldInitialListener.contextInitialized(WeldInitialListener.java:101)
at io.undertow.servlet.core.ApplicationListeners.contextInitialized(ApplicationListeners.java:173)
at io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:193)
... 7 more

The stacktrace says something about a FacesContext, I thought messages independent from JSF... Messages work normally in any other situation, even in a RESTful endpoint:

@Path("svctest")
@RequestScoped
public class SvcTest {

@Inject
private Messages messages;

@GET
@Path("administrador")
public String run()

{ /* look Mom, no FacesContext! ;) */ return this.messages.administrador(); }

}

Result of invocation:

GET HTTP/1.1 http://localhost:8080/app/services/svctest/administrador

Administrador

What am I doing wrong here? What can I do to run code that needs to use typesafe messages at application startup? Thanks for your attention.