AEM 6.4 Servlet POST request not hitting servlet | Community
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grantc99475970
Level 3
May 18, 2018 10:24 PM UTC
Solved

AEM 6.4 Servlet POST request not hitting servlet

My problem is similar to the one described here: AEM 6.4 - Java sling servlet does not work with uber 6.4 jar, but does with uber 6.3

I have the following Servlet:

@Component(service=Servlet.class,
    property={
        Constants.SERVICE_DESCRIPTION + "=Video servlet",
        "sling.servlet.methods=" + HttpConstants.METHOD_POST,
        "sling.servlet.paths="+ "/bin/damUpload/video"
    }
)
public class VideoServlet extends SlingAllMethodsServlet {
// ...
 @Override protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {
            System.out.println("POST TO /bin/damUpload/video");
             // ...

When I do a POST to localhost:4502/bin/damUpload/video, I get a 500 error: 

18.05.2018 14:47:24.020 *ERROR* [0:0:0:0:0:0:0:1 [1526676444017] POST /bin/damUpload/video HTTP/1.1] org.apache.sling.servlets.post.impl.operations.ModifyOperation Unable to create resource named damUpload in /bin
18.05.2018 14:47:24.020 *ERROR* [0:0:0:0:0:0:0:1 [1526676444017] POST /bin/damUpload/video HTTP/1.1] org.apache.sling.servlets.post.impl.operations.ModifyOperation Exception during response processing.
org.apache.sling.api.resource.PersistenceException: Unable to create node at /bin/damUpload
    at org.apache.sling.jcr.resource.internal.helper.jcr.JcrResourceProvider.create(JcrResourceProvider.java:480) [org.apache.sling.jcr.resource:3.0.8]
    at org.apache.sling.resourceresolver.impl.providers.stateful.AuthenticatedResourceProvider.create(AuthenticatedResourceProvider.java:182) [org.apache.sling.resourceresolver:1.5.34]
    at org.apache.sling.resourceresolver.impl.helper.ResourceResolverControl.create(ResourceResolverControl.java:381) [org.apache.sling.resourceresolver:1.5.34]

I don't see the output for the System.out.println in my stdout.log, so I don't think it ever gets hit.

My bundle appears to be installed and active, and my service appears to be registered:

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    arunpatidar
    arunpatidarAccepted solution
    New Participant
    May 21, 2018 4:51 PM UTC

    Yours imports are fine. could you please try to invoke simple servlet with Get method for testing, to check whether issue is with code or something else.

    @Component(service=Servlet.class,

    property={

    Constants.SERVICE_DESCRIPTION + "=Simple Demo Servlet",

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

    "sling.servlet.paths="+ "/bin/damUpload/video",

    })

    public class SimplePostServlet extends SlingAllMethodsServlet {

    /**

      *

      */

      private static final long serialVersionUID = 1L;

    @Override

    protected void doGet(final SlingHttpServletRequest req,

    final SlingHttpServletResponse resp) throws ServletException, IOException {

            resp.setContentType("text/plain");

            resp.getWriter().write("Servlet found!");

            System.out.println("Servlet found!");

        }

    }

    Arun Patidar
    View reply

    9 replies

    VeenaVikraman
    VeenaVikraman
    New Participant
    Mar 13, 2019 9:13 AM UTC

    Obviously, this is the expected behaviour in this case , as you are actually doing a "POST" to a resource path. If the resource path points to a custom servlet , or has a servlet registered for its resourceType , then your custom servlet will be executed. Otherwise it will be treated a default POST call and all your data will get saved to the node you mentioned.

    Translate
      shaheenas113483
      shaheenas113483
      Level 3
      Mar 13, 2019 5:28 AM UTC

      No, I just added the exact code and made a call like:

      $.get(

                                 "/bin/damUpload/video",

                             {comment : comment},

                             function(result) {

                                 window.alert('Here is your result : <strong>' + result + '</strong>');

                              }

                      );

      it works, but when I changed the path to :/content/we-retail/ca/fr/jcr:content, it stopped working.

      Translate
      shaheenas113483
      shaheenas113483
      Level 3
      Mar 13, 2019 5:27 AM UTC

      Sorry, my mistake, I dint mention it clearly.

      My first query is:

      When I am using this code:

      $.post(

                                 "/content/we-retail/ca/fr/jcr:content/",

                             {variableName : value},

                             function(result) {

                                 window.alert('Here is your result : <strong>' + result + '</strong>');

                              }

                      );

      , in a ".js" file,

      the data gets persisted to the node at this path, without a servlet. I am not sure how that is happening. Is there any default servlet provided by AEM which is being used? 

      Translate
      arunpatidar
      arunpatidar
      New Participant
      Mar 12, 2019 9:26 PM UTC

      Hi,

      What is your action url? why are you making call to /content/we-retail/ca/fr/jcr:content/?

      You should make a Ajax call to /bin/damUpload/video

      e.g.

      $.post(

                                 "/bin/damUpload/video",

                             {variableName : value},

                             function(result) {

                                 window.alert('Here is your result : <strong>' + result + '</strong>');

                              }

                      );

      Translate
      Arun Patidar
      VeenaVikraman
      VeenaVikraman
      New Participant
      Mar 12, 2019 6:43 PM UTC

      Shaheen ,

        For the above code Arun provided , did you add doPost before testing POST call ?

      Translate
      shaheenas113483
      shaheenas113483
      Level 3
      Mar 12, 2019 1:15 PM UTC

      I have created a servlet with the above the code mentioned by you, I have also build it successfully, when I accessed the page:http://localhost:/bin/damUpload/videohttp://localhost:8502/bin/damUpload/video, I found the message "servlet found!"

      I am making a post call using the code:

      $.post(

                                 "/content/we-retail/ca/fr/jcr:content/",

                             {variableName : value},

                             function(result) {

                                 window.alert('Here is your result : <strong>' + result + '</strong>');

                              }

                      );

      it is creating a node and writing the data to the node's property without a servlet. I think it making use of defaultPostServlet, but how can I make a call to this custom servlet?

      Translate
      arunpatidar
      arunpatidarAccepted solution
      New Participant
      May 21, 2018 4:51 PM UTC

      Yours imports are fine. could you please try to invoke simple servlet with Get method for testing, to check whether issue is with code or something else.

      @Component(service=Servlet.class,

      property={

      Constants.SERVICE_DESCRIPTION + "=Simple Demo Servlet",

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

      "sling.servlet.paths="+ "/bin/damUpload/video",

      })

      public class SimplePostServlet extends SlingAllMethodsServlet {

      /**

        *

        */

        private static final long serialVersionUID = 1L;

      @Override

      protected void doGet(final SlingHttpServletRequest req,

      final SlingHttpServletResponse resp) throws ServletException, IOException {

              resp.setContentType("text/plain");

              resp.getWriter().write("Servlet found!");

              System.out.println("Servlet found!");

          }

      }

      Translate
      Arun Patidar
        grantc99475970Author
        Level 3
        May 21, 2018 4:03 PM UTC

        arunp99088702

        I think I'm using the new osgi annotation. I have also tried the solution in Jorg's answer on the related post before asking this question.

        My imports for the servlet are these:

        import org.apache.sling.api.SlingHttpServletRequest;
        import org.apache.sling.api.SlingHttpServletResponse;
        import org.apache.sling.jcr.api.SlingRepository;
        import org.apache.sling.api.servlets.SlingAllMethodsServlet;
        import org.osgi.service.component.annotations.Component;
        import org.osgi.service.component.annotations.Reference;
        import java.io.IOException;
        import javax.jcr.Session;
        import javax.servlet.Servlet;
        import javax.servlet.ServletException;
        import org.apache.sling.api.servlets.HttpConstants;
        import org.osgi.framework.Constants;

        These are in my pom file:

        <dependency>
                    <groupId>org.apache.felix</groupId>
                    <artifactId>org.apache.felix.scr</artifactId>
                    <version>1.6.0</version>
                    <scope>provided</scope>
                </dependency>
                <dependency>
                    <groupId>org.apache.felix</groupId>
                    <artifactId>org.apache.felix.scr.annotations</artifactId>
                    <version>1.9.6</version>
                    <scope>provided</scope>
                </dependency>
                <dependency>
                    <groupId>biz.aQute</groupId>
                    <artifactId>bndlib</artifactId>
                    <version>1.50.0</version>
                    <scope>provided</scope>
                </dependency>
                <dependency>
                    <groupId>org.osgi</groupId>
                    <artifactId>org.osgi.core</artifactId>
                    <version>4.2.0</version>
                    <scope>provided</scope>
                </dependency>
                <dependency> 
                    <groupId>org.osgi</groupId> 
                    <artifactId>org.osgi.service.component.annotations</artifactId>
                    <version>1.3.0</version>
                </dependency>
                <dependency>
                    <groupId>org.osgi</groupId>
                    <artifactId>org.osgi.service.metatype.annotations</artifactId>
                    <version>1.3.0</version> 
                </dependency>
                <dependency>
                    <groupId>org.osgi</groupId>
                    <artifactId>org.osgi.annotation</artifactId>
                    <version>6.0.0</version>
                </dependency>
                <dependency>
                    <groupId>org.osgi</groupId>
                    <artifactId>org.osgi.compendium</artifactId>
                    <version>4.2.0</version>
        <scope>provided</scope>
                </dependency>
        Translate
        arunpatidar
        arunpatidar
        New Participant
        May 19, 2018 2:44 PM UTC

        Hi,

        I tried your code for me its working.

        Are you using new osgi annotation or felix annotation? Please check Jorg's answer in related Post.

        Thanks

        Arun

        Translate
        Arun Patidar
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