Getting error log "AEM failed to activate Use class" | Community
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ShagunMalik
Level 3
Jun 29, 2021 9:59 AM UTC
Solved

Getting error log "AEM failed to activate Use class"

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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Dipti_Chauhan
Dipti_ChauhanAccepted solution
New Participant
Jun 29, 2021 10:37 AM UTC

Hi @shagunmalik 

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

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

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18 replies

ShagunMalikAuthor
Level 3
Jun 29, 2021 11:55 AM UTC

Thank you everyone.

@gnanendraponnala @bimmiso @ritesh_mittal @dipti_chauhan 

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GnanendraPonnala
GnanendraPonnala
Level 2
Jun 29, 2021 11:28 AM UTC

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.

}

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    ShagunMalikAuthor
    Level 3
    Jun 29, 2021 11:34 AM UTC

    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.

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    BimmiSo
    Employee
    Jun 29, 2021 11:21 AM UTC

    @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

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      Dipti_Chauhan
      Dipti_ChauhanAccepted solution
      New Participant
      Jun 29, 2021 10:37 AM UTC

      Hi @shagunmalik 

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

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

      Translate
        ShagunMalikAuthor
        Level 3
        Jun 29, 2021 10:43 AM UTC
        @dipti_chauhan, thank you for that but the issue is still the same. I'm getting error as above and it is throwing NullPoineterException: null.
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        Dipti_Chauhan
        Dipti_Chauhan
        New Participant
        Jun 29, 2021 10:14 AM UTC

        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

         

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          Ritesh_Mittal
          Ritesh_Mittal
          New Participant
          Jun 29, 2021 10:09 AM UTC

          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?

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            ShagunMalikAuthor
            Level 3
            Jun 29, 2021 10:18 AM UTC
            Yes @ritesh_mittal, I'm getting NullPoineterException: null
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