private String appendCoreJerseyPackages(String jerseyResourcePkgListForAdminPages) {
    String pkgPath = adminContainerConfig.jerseyResourcePkgList();
    if (jerseyResourcePkgListForAdminPages != null
        && !jerseyResourcePkgListForAdminPages.isEmpty()) {
      pkgPath += ";" + jerseyResourcePkgListForAdminPages;
    }

    return pkgPath;
  }
  /**
   * Starts the container and hence the embedded jetty server.
   *
   * @throws Exception if there is an issue while starting the server
   */
  @PostConstruct
  public void init() throws Exception {
    try {
      if (alreadyInited.compareAndSet(false, true)) {
        initAdminContainerConfigIfNeeded();
        initAdminRegistryIfNeeded();

        if (!adminContainerConfig.shouldEnable()) {
          return;
        }

        if (adminContainerConfig.shouldScanClassPathForPluginDiscovery()) {
          adminPageRegistry.registerAdminPagesWithClasspathScan();
        }

        Injector adminResourceInjector;
        if (shouldShareResourcesWithParentInjector()) {
          adminResourceInjector = appInjector.createChildInjector(buildAdminPluginsGuiceModules());
        } else {
          adminResourceInjector =
              LifecycleInjector.builder()
                  .inStage(Stage.DEVELOPMENT)
                  .usingBasePackages("com.netflix.explorers")
                  .withModules(buildAdminPluginsGuiceModules())
                  .build()
                  .createInjector();
          adminResourceInjector.getInstance(LifecycleManager.class).start();
        }

        server = new Server(adminContainerConfig.listenPort());

        // redirect filter based on configurable RedirectRules
        final Context rootHandler = new Context();
        rootHandler.setContextPath("/");
        rootHandler.addFilter(
            new FilterHolder(adminResourceInjector.getInstance(RedirectFilter.class)),
            "/*",
            Handler.DEFAULT);
        rootHandler.addServlet(new ServletHolder(new DefaultServlet()), "/*");

        // admin page template resources
        AdminResourcesFilter arfTemplatesResources =
            adminResourceInjector.getInstance(AdminResourcesFilter.class);
        arfTemplatesResources.setPackages(adminContainerConfig.jerseyViewableResourcePkgList());

        final Context adminTemplatesResHandler = new Context();
        adminTemplatesResHandler.setContextPath(adminContainerConfig.templateResourceContext());
        adminTemplatesResHandler.setSessionHandler(new SessionHandler());
        adminTemplatesResHandler.addFilter(LoggingFilter.class, "/*", Handler.DEFAULT);
        adminTemplatesResHandler.addFilter(
            new FilterHolder(adminResourceInjector.getInstance(RedirectFilter.class)),
            "/*",
            Handler.DEFAULT);
        adminTemplatesResHandler.addFilter(
            new FilterHolder(arfTemplatesResources), "/*", Handler.DEFAULT);
        adminTemplatesResHandler.addServlet(new ServletHolder(new DefaultServlet()), "/*");

        // admin page data resources
        final String jerseyPkgListForAjaxResources =
            appendCoreJerseyPackages(adminPageRegistry.buildJerseyResourcePkgListForAdminPages());
        AdminResourcesFilter arfDataResources =
            adminResourceInjector.getInstance(AdminResourcesFilter.class);
        arfDataResources.setPackages(jerseyPkgListForAjaxResources);

        final Context adminDataResHandler = new Context();
        adminDataResHandler.setContextPath(adminContainerConfig.ajaxDataResourceContext());
        adminDataResHandler.addFilter(
            new FilterHolder(adminResourceInjector.getInstance(RedirectFilter.class)),
            "/*",
            Handler.DEFAULT);
        adminDataResHandler.addFilter(new FilterHolder(arfDataResources), "/*", Handler.DEFAULT);
        adminDataResHandler.addServlet(new ServletHolder(new DefaultServlet()), "/*");

        QueuedThreadPool threadPool = new QueuedThreadPool();
        threadPool.setDaemon(true);
        server.setThreadPool(threadPool);

        HandlerCollection handlers = new HandlerCollection();
        handlers.setHandlers(
            new Handler[] {adminTemplatesResHandler, adminDataResHandler, rootHandler});
        server.setHandler(handlers);

        server.start();

        final Connector connector = server.getConnectors()[0];
        serverPort = connector.getLocalPort();
      }
    } catch (Exception e) {
      logger.error("Exception in building AdminResourcesContainer ", e);
    }
  }
 private boolean shouldShareResourcesWithParentInjector() {
   return appInjector != null && !adminContainerConfig.shouldIsolateResources();
 }