Getting error log "AEM failed to activate Use class" | Community
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ShagunMalik
Level 3
June 29, 2021
Solved

Getting error log "AEM failed to activate Use class"

  • June 29, 2021
  • 6 replies
  • 4819 views

Hey Community

I have wriiten this basic code to get cq:tags property of current page

public Void activate throws exception{

rootpage=getCurrentPage;

Resource res = getResourceResolver.getResource(rootpage.getPath()+"/jcr:content/");

         ValueMap pageProperties = res .getValueMap();

         tag= (String) pageProperties.get("cq:tags", "Default value");

logger.info(tag);

}

 

When I'm using creating object using HTL statement in HTMl file it is not displaying anything on page and error log says "AEM failed to activate Use class"

How to resolve it?

@ritesh_mittal 

@dipti_chauhan Please suggest.

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Best answer by Dipti_Chauhan

Hi @shagunmalik 

BTW there is no need to add slash after jcr:content. It should be 

Resource res = getResourceResolver.getResource(rootpage.getPath()+"/jcr:content");

6 replies

Ritesh_Mittal
Community Advisor and Adobe Champion
Ritesh_MittalCommunity Advisor and Adobe Champion
Community Advisor and Adobe Champion
June 29, 2021

Hi @shagunmalik ,

 

You must be getting some exception like NullPoineterException or something in the logs which is happening inside Active method of your class. Could you provide the error logs?

    S
    ShagunMalikAuthor
    Level 3
    June 29, 2021
    Yes @ritesh_mittal, I'm getting NullPoineterException: null
    Dipti_Chauhan
    Community Advisor
    Dipti_ChauhanCommunity Advisor
    Community Advisor
    June 29, 2021

    Hi @329280 

     May be there is some exception in activate method. Please debug your code using debugger and find out where you getting exception.

     

    And normally you should not write any logic inside activate method. Create different getter to get properties because if there is any issue in you code written within activate method your class activation will get failed

     

    Thanks

    Dipti

     

      Dipti_Chauhan
      Community Advisor
      Dipti_ChauhanCommunity AdvisorAccepted solution
      Community Advisor
      June 29, 2021

      Hi @shagunmalik 

      BTW there is no need to add slash after jcr:content. It should be 

      Resource res = getResourceResolver.getResource(rootpage.getPath()+"/jcr:content");

        Dipti_Chauhan
        Community Advisor
        Dipti_ChauhanCommunity Advisor
        Community Advisor
        June 29, 2021
        you need to debug this. At what point you getting NLP. could be your resource null or resourceresolver object is null.
        B
        Adobe Employee
        BimmiSoAdobe Employee
        Adobe Employee
        June 29, 2021

        @shagunmalik ,

         

        Resource res = getResourceResolver.getResource(rootpage.getPath()+"/jcr:content/");

        remove the slash from the end

        Resource res = getResourceResolver.getResource(rootpage.getPath()+"/jcr:content");

         

        if still the issue persists add loggers or run your class in debug mode to get the exact line where there is exception

         

        Hope this helps

          GnanendraPonnala
          GnanendraPonnala
          Level 2
          June 29, 2021

          Hi @shagunmalik ,

           

          Could you please verify below line

          tag= (String) pageProperties.get("cq:tags", "Default value");

           

          By Default  cq:tags are String Array not a String Field 

          String[] tagArrays =  pageProperties.get("cq:tags", String[].class);

          if(Objects.nonNull(tagArrays ) && tagArrays .length>0) {

               tag = tagArrays[0]; -- will give first value in array.

          }

            S
            ShagunMalikAuthor
            Level 3
            June 29, 2021

            Hey, @gnanendraponnala  I get your point but Even if I'm trying to access any other property of page which is of type String such as cq:template then still it is not working.

            S
            ShagunMalikAuthor
            Level 3
            June 29, 2021

            Thank you everyone.

            @gnanendraponnala @bimmiso @ritesh_mittal @dipti_chauhan 

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