I'm trying to put in place a screen flow component in order to display knowledge articles based on the case fields and Knowledge-articles data category.

In order to do so, I've created an apex class that I use to query for my KnowledgeArticleVersion that I will be using in my flow.

Here's my Apex Class:

public class KnowledgeArticleLookup {

   public static List<KnowledgeArticleVersion> getMyArticles (){
     string varType1;
     string varType2;
     List<KnowledgeArticleVersion> Articles = new List<KnowledgeArticleVersion>();
    if(varType1 == 'Global Info'){
        If(varType2 == 'Location'){
                Articles = [SELECT Id,Title FROM KnowledgeArticleVersion WHERE PublishStatus='online' with DATA CATEGORY Global_Knowledge__c AT Location__c];
      return Articles;

Knowing that vartype1 and vartype2 are values used in my flow ( in a get element), I was wondering how I can pass these two variables to my apex class and how I can pass my Articles(list) to my Flow.

1 Answer 1


To create an input and output from flow to apex or vice versa, you will need to ensure you annotate them as @InvocableVariable.

To make your apex method available as an action, annotate the method with @InvocableMethod

So here is how you will modify your apex,

public class KnowledgeArticleLookup {

   @InvocableMethod(label='Get Knowledge Articles' description='Gets knowledge article results')
   public static List<List<Response>> getMyArticles (List<Request> req){
    List<KnowledgeArticleVersion> Articles = new List<KnowledgeArticleVersion>();

    if(req[0].varType1 == 'Global Info'){
      if(req[0].varType2 == 'Location'){
            articles = [SELECT Id,
                             FROM KnowledgeArticleVersion 
                             WHERE PublishStatus='online' 
                             WITH DATA CATEGORY 
                             Global_Knowledge__c AT Location__c];
    List<List<Response>> outputResponse = new List<List<Response>>();
    List<Response> responses = new List<Response>();
    for(KnowledgeArticleVersion kav: articles) {
         Response response = new Response();
         response.articleversionId = kav.Id;
         response.articleTitle = kav.Title;
   return outputResponse;

  public class Request {
     public String varType1;
     public String varType2;

   public class Response {
       public String articleversionId;
       public String articleTitle;
  • Hi @Mohith, Thanks for your response. I copied and pasted the code that you provided. However, I get the following error : Illegal conversion from Object to List<List<KnowledgeArticleVersion>>
    – user52619
    Aug 5, 2021 at 14:46
  • btw, methods with @Invocable annotation accept only one parameter
    – user52619
    Aug 5, 2021 at 14:54
  • You can create a wrapper class for response and request and that should be good enough to fix these. Hope that helps Aug 5, 2021 at 15:34
  • I did create my wrapper class which looks like this: public class Request{ @InvocableVariable(required=true) public String varType1; @InvocableVariable(required=true) public String varType2; } public class Result{ @InvocableVariable public List<List<KnowledgeArticleVersion>> outputResponse; } but what should i put as a return value? i'm confused.
    – user52619
    Aug 5, 2021 at 16:24
  • I did update the answer with wrapper Aug 5, 2021 at 16:25

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