What is the equivalent of web.xml's <env-entry> tag when using ServletContainerInitializer?

I'm trying to replace my web.xml file with a code based class that extends from Spring's WebApplicationInitializer. My web.xml file has a couple "env-entry" elements. I'm trying to figure out how to set these in my WebApplicationInitializer class, but with no luck. Perhaps someone knows the code equivalent of these tags?

public class MyWebApplicationInitializer implements WebApplicationInitializer {

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        XmlWebApplicationContext appContext = new XmlWebApplicationContext();
        appContext.setConfigLocation("WEB-INF/springmvc-servlet.xml");

        Dynamic servlet = servletContext.addServlet("springmvc", new DispatcherServlet(appContext));
        servlet.setLoadOnStartup(1);
        servlet.addMapping("/*");

        //How do I add this?
        //  <env-entry>
        //      <env-entry-name>logback/configuration-resource</env-entry-name>
        //      <env-entry-type>java.lang.String</env-entry-type>
        //      <env-entry-value>logback.xml</env-entry-value>
        //  </env-entry>    
    }
}

The <env-entry> just declares essentially a web app context attribute, something you can bind yourself with ServletContext#setAttribute() that you already have there

   servletContext.setAttribute("logback/configuration-resource", "logback.xml");