How to retrieve data from field with multiple="true" in AEM's WorkflowProcess?

Question

Sorry if this is a basic question, as I am quite new to AEM.

I have a cq dialog allowing multiple tags to be entered.

<tags
cq:showOnCreate="{Boolean}true"
jcr:primaryType="nt:unstructured"
sling:resourceType="/libs/cq/gui/components/coral/common/form/tagfield"
allowCreate="{Boolean}true"
fieldLabel="Tags to add"
metaType="tags"
multiple="true" <====================
name="./metaData/TAGS"/>

I am trying to retrieve the two tags above in my WorkflowProcess as below:

@Component(
    //...
)
public class TagStep implements WorkflowProcess {
    @Override
    public void execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap processArguments) {
        try {
                //...
                List<String> tagslist = new ArrayList();
                List<String> tags = processArguments.get("TAGS",tagslist);

                // Nothing logged here <=======
                for (String tag: tags) {
                    LOG.info(tag);
                }

                //...
        } catch (Exception e){
            LOG.info("\n ERROR {} ",e.getMessage());
        }
    }
}

There is no output when I try to log tag in the loop above, probably the return type of List<String> cannot be converted.

What is the proper return type when using multiple="true", and how to use processArguments.get to get the values?

Btw my code was based on the tutorial here.

Thank you,

Answer 1

After looking into the source implementation, it is using an Array, not a List. so here is how to retrieve the passed in data.

Node node = (Node) session.getItem(path);

String[] cars = {};
String[] tags = processArguments.get("TAGS",cars);

node.setProperty("cq:tags", tags);