NullPointerException in resolverFactory.getServiceResourceResolver(param) | Community
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A
azus_Khan
Level 2
January 25, 2019

NullPointerException in resolverFactory.getServiceResourceResolver(param)

  • January 25, 2019
  • 2 replies
  • 4807 views

I am trying to access page properties using services in AEM 6.4

I have created  an interface,

public interface AccessPageProp {

public String getPageProp();

}

I have created a class that implements this interface,

@Component(service = AcccessPagePropImpl.class, immediate = true)

public class AcccessPagePropImpl implements AccessPageProp {

Logger logger = LoggerFactory.getLogger(AcccessPagePropImpl.class);

@Reference

private ResourceResolverFactory resolverFactory;

@Override

public String getPageProp() {

logger.info("Entering into getPageProp()...");

String title = "";

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

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

ResourceResolver resourceResolver = null;

try {

resourceResolver = resolverFactory.getServiceResourceResolver(param);

Resource pageResource = resourceResolver.getResource("/content/MyProject/en/TestPageName/jcr:content");

Page myPage = pageResource.adaptTo(Page.class);

title = myPage.getTitle();

return title;

} catch (Exception e) {

logger.info("Exception...."+e.toString());

e.printStackTrace();

}

return title;

}

}

I am getting "java.lang.NullPointerException" in line "resourceResolver = resolverFactory.getServiceResourceResolver(param);"

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    2 replies

    Gaurav-Behl
    Gaurav-Behl
    Level 10
    January 25, 2019

    What versions of scr-annotations, maven-bundle-plugin and uber-jar do you use in 6.4?

    Can you check in /system/console/bundles and /components that the service is generated/active?

    Check if you have assigned appropriate permissions to the "readService" against the package name of bundle.

    Could you also share the stack trace?

    smacdonald2008
    smacdonald2008
    Level 10
    January 25, 2019

    Looks like you Sling Service Mapping may not have been configured properly. DId you use the Symbolic name of the OSGi bundle?

    As @@Gaurav Behl mentions too - ensure that your system user has the correct permissions.

    I strongly recommend that you go through this HELPX Article. It will walk you through this use case on 6.4:

    Adobe Experience Manager Help | Using the Sling Strongly-typed API to retrieve content from Adobe Experience Manager 6.4

    It even uses the PageManager API.

    A
    azus_KhanAuthor
    Level 2
    January 28, 2019

    Can you please paste the error log here. I doubt there should be something we can figure out from the error logs itself .

    PS:- Do cross verify the imports for your @Reference .


    I used below import statement for @Reference

    import org.osgi.service.component.annotations.Reference;

    I used logger to print exception in my catch block like,

    catch (Exception e) {

    logger.info("Exception...." + e.toString());

    e.printStackTrace();

    }

    It prints the below message,

    com.myproject.core.AcccessPagePropImpl Exception....java.lang.NullPointerException

    A
    azus_KhanAuthor
    Level 2
    January 29, 2019

    My issue has been resolved when I used getSlingHelper() instead of creating a new object using new keyword in the Activate() ​method.

    AccessPageProp accessPageProp = getSlingScriptHelper().getService(AccessPagePropImpl.class);

      karl515-YhciiQ
      karl515-YhciiQ
      May 15, 2019

      Hello,

      I am getting the error your getting. may I know how did you resolve it?

      but I have a different approach.

      I am accessing "ResourceResolver resourceResolver = resolverFactory.getServiceResourceResolver(param);:

      in a PostConstruct init() class.

      VeenaVikraman
      Community Advisor
      VeenaVikramanCommunity Advisor
      Community Advisor
      May 22, 2019

      karl515-qd9WHG​

          Are your service user available for the bundle ? Do you get any error in the logs ?

      Thanks

      Veena

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