tomcat jersey retrieve full context path

I’m implementing ApplicationEventListener, I need to retrieve the context path, the one declared in my web.xml:

<servlet-mapping>
    <servlet-name>MyApplication</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>

I’m implementing onEvent method

@Override
public void onEvent(ApplicationEvent event) {
    if (event.getType() == ApplicationEvent.Type.INITIALIZATION_FINISHED) {
        final ResourceModel resourceModel = event.getResourceModel();           
    }
}

I can also use @Context ServletContext servletContext in ResourceConfig to pass the info if necessary but I don’t know how to reach this.

From a servlet using HttpServletRequest, it’s possible to call request.getContextPath(), but obviously I can’t use HttpServletRequest.

Thanks