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fredm71868943
fredm71868943
May 10, 2018
Question

AEM - Java servlet can't register on fresh 6.4 install

  • May 10, 2018
  • 4 replies
  • 3111 views

Hey Everyone,

I've been dealing with a really tricky issue on a fresh AEM 6.4 install. One of my servlets cannot start. It can register fine and shows up okay however, it always throws a 404 at the path its registered at. I deleted and re-installed my AEM and the issue still persists. The error is very cryptic and there isnt much on the internet about it.

Has anyone every seen? "Service factory returned null"

10.05.2018 14:45:04.358 *ERROR* [FelixDispatchQueue] org.apache.sling.servlets.resolver FrameworkEvent ERROR (org.osgi.framework.ServiceException: Service factory returned null. (Component: com.amsurg.core.servlets.RSSXMLServlet (3142)))

org.osgi.framework.ServiceException: Service factory returned null. (Component: com.amsurg.core.servlets.RSSXMLServlet (3142))

It's nothing with my code and I have several other servlets that register just fine. This particular one was working earlier then just stopped. Anyone have any troubleshooting ideas? I've tried re-building, restarting AEM, and checking the servlet sling checker but nothing seems to be able to find it.

It registers okay and shows up in the bundle as

Service ID 6903Types: javax.servlet.Servlet
Service PID: com.amsurg.core.servlets.RSSXMLServlet
Component Name: com.amsurg.core.servlets.RSSXMLServlet
Component ID: 3142
Vendor: Adobe

But underneath it there is no part that looks like this

Types: org.apache.sling.spi.resource.provider.ResourceProvider

Description: ServletResourceProvider for Servlets at [/libs/amsurg/structure/page/GET.servlet, /libs/amsurg/structure/page/HEAD.servlet]

Anyone have any troubleshooting ideas? This is how it is registered - @SlingServlet(paths = "/bin/feed", methods = "GET", metatype = true)

Thanks

Brendan

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    4 replies

    arunpatidar
    Community Advisor
    arunpatidarCommunity Advisor
    Community Advisor
    May 10, 2018

    I tried to create servlet in AEM6.4, for me its working fine.

    below is sample servlet code which I've created

    @Component(service=Servlet.class,immediate=true,

      property= {

      Constants.SERVICE_DESCRIPTION + "=TitleSlindServlet Demo Servlet",

      "sling.servlet.paths=/bin/aem64app/titleservlet",

                "sling.servlet.methods=" + HttpConstants.METHOD_GET,

                "sling.servlet.extensions=" + "html"

      })

    public class TitleSlingServlet extends SlingSafeMethodsServlet{

      private static final long serialVersionUID = 1L;

      @Override

        protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {

      response.setHeader("Content-Type", "text/html");

        response.getWriter().print("<h1>Sling Servlet injected this title");

      response.getWriter().close();

        }  

    }

    Thanks

    Arun

    Arun Patidar
      kautuk_sahni
      Community Manager
      kautuk_sahniCommunity Manager
      Community Manager
      May 11, 2018

      Can you please share your code? and full error.log?

      Team would require Source code to check this up. Maybe you using service which is no longer available in AEM.

      -Kautuk

      Kautuk Sahni
      smacdonald2008
      smacdonald2008
      Level 10
      May 11, 2018

      For more current versions of AEM - you should be DS annotations ( org.osgi.service.component.annotations.Component) to create Servlets.

      /**

      * Servlet that writes some sample content into the response. It is mounted for

      * all resources of a specific Sling resource type. The

      * {@link SlingSafeMethodsServlet} shall be used for HTTP methods that are

      * idempotent. For write operations use the {@link SlingAllMethodsServlet}.

      */

      @Component(service=Servlet.class,

              property={

                      Constants.SERVICE_DESCRIPTION + "=Simple Demo Servlet",

                      "sling.servlet.methods=" + HttpConstants.METHOD_POST,

                      "sling.servlet.paths="+ "/bin/myDataSourcePoolServlet"

                 })

      public class SimpleServlet extends SlingAllMethodsServlet {

      See this article for an example -- Scott's Digital Community: Creating a Mail List Component for the Experience Manager Toy Store Site

      Ravi_Pampana
      Community Advisor
      Ravi_PampanaCommunity Advisor
      Community Advisor
      July 12, 2018

      Also make sure you are not using JcrResourceResolverFactory or loginadministrator to get resourceResolver object and use system user to get the resolver as shown below

      Map<String, Object> param = new HashMap<String, Object>();

      param.put(ResourceResolverFactory.SUBSERVICE, "user");

      ResourceResolver resolver = null;

      try {

           resolver = resolverFactory.getServiceResourceResolver(param);

           session = resolver.adaptTo(Session.class);

      }...

      Hope it helps!

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