Originally I just added a @configuration file for SprintData-Rest and got my entities working in my existing SpringMVC app, but then I realized it was stomping on the web portion of my app (mapped to / ) So I've reworked the initializer to add a separate DispatcherServlet. I added the code around line 39 to try and add SpringData-Rest with a pre…

RestConfig.java

import org.springframework.context.annotation.Configuration;
import org.springframework.data.rest.webmvc.RepositoryRestMvcConfiguration;

// @Configuration 
public class RestConfig extends RepositoryRestMvcConfiguration {

  
	public RestConfig() {
		System.out.println("Rest Config");
	}
}

SpringWebAppInitializer.java

import java.util.Set;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;

import lombok.extern.slf4j.Slf4j;

import org.springframework.data.rest.webmvc.RepositoryRestExporterServlet;
import org.springframework.web.SpringServletContainerInitializer;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.ContextLoaderListener;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.filter.DelegatingFilterProxy;
import org.springframework.web.servlet.DispatcherServlet;

/**
 * Bootstraps the Spring Application via Spring's automagic {@link SpringServletContainerInitializer}.
 * See {@code WebApplicationInitializer} for more information.
 *
 */
@Slf4j
public class SpringWebAppInitializer implements WebApplicationInitializer {

  @Override
    public void onStartup(final ServletContext servletContext) throws ServletException {
		
		
        AnnotationConfigWebApplicationContext ctx = getWebAppContext();
        addSecurityFilter(servletContext);
        addSocialFilter(servletContext);
        addDispatcherServlet(servletContext, ctx);
        servletContext.addListener(new ContextLoaderListener(ctx));

        log.info("Successfully Configured Web Application");
        
        // FIXME get this working?
        AnnotationConfigWebApplicationContext restCtx = new AnnotationConfigWebApplicationContext();
        restCtx.setConfigLocation(RestConfig.class.getName());
        RepositoryRestExporterServlet exporter = new RepositoryRestExporterServlet(restCtx);
        exporter.setContextConfigLocation(RestConfig.class.getName());
        ServletRegistration.Dynamic reg = servletContext.addServlet("rest-exporter", exporter);
        reg.setLoadOnStartup(1);
        reg.addMapping("/api/*");
    }
	
	private AnnotationConfigWebApplicationContext getWebAppContext(){
		AnnotationConfigWebApplicationContext root = new AnnotationConfigWebApplicationContext();
        root.scan( getClass().getPackage().getName() );
        return root;
	}
	
	
	private void addDispatcherServlet(ServletContext servletContext, WebApplicationContext root) {
		ServletRegistration.Dynamic appServlet = servletContext.addServlet("dispatchServlet", new DispatcherServlet(root));
        appServlet.setLoadOnStartup(1);
        Set<String> mappingConflicts = appServlet.addMapping("/");
        if (!mappingConflicts.isEmpty()) {
        	log.warn("Mapping conflict encountered when mapping DispatcherServlet to '/' ");
            throw new IllegalStateException("Failed mapping dispatcher to root");
        }
	}

	private void addSecurityFilter(ServletContext servletContext){
		// Add Spring Security Filter
		DelegatingFilterProxy securityFilter = new DelegatingFilterProxy();
        servletContext.addFilter("springSecurityFilterChain", securityFilter)
        	.addMappingForUrlPatterns(null,false,"/*");
        log.info("Wired in springSecurityFilterChain delegate");
	}
	
	/**
	 * Note: this <b>must</b> be called AFTER the security filter has been added 
	 */
	private void addSocialFilter(ServletContext servletContext) {
		DelegatingFilterProxy socialFilter = new DelegatingFilterProxy();
        servletContext.addFilter("socialClientAuthenticationFilter", socialFilter)
        	.addMappingForUrlPatterns(null, false, SocialConfig.CALLBACK_URL);
        log.info("Wired in socailFilter delegate to " + SocialConfig.CALLBACK_URL);
	}

}