JSF cant resolve bean in xhtml file using spring boot

Question

i have a simple JSF xhtml page contains xml:

<h:body>
    <h:outputText value='#{someBean == null ? "null" : "not null"}'/>
</h:body>

my faces-config contains:

<application>
    <el-resolver>org.springframework.web.jsf.el.SpringBeanFacesELResolver</el-resolver>
</application>

and i have a java configuration bean like

@Bean
public ServletRegistrationBean jsfServletRegistration (ServletContext servletContext) {
    servletContext.setInitParameter("com.sun.faces.forceLoadConfiguration", Boolean.TRUE.toString());

    ServletRegistrationBean srb = new ServletRegistrationBean();
    srb.setServlet(new FacesServlet());
    srb.setUrlMappings(Collections.singletonList("*.xhtml"));
    srb.setLoadOnStartup(1);
    return srb;
}

and a bean like:

@Component
@ViewScoped
@ManagedBean
public class SomeBean {
    public String message() {
        return "some";
    }
}

here, when i go to the page i get null string as response...

note: i can access my pages using browser.

why cant i get someBean inside xhtml file ?