Extend StagedModelDataHandler for Journal Article in Staging

Question

I am working on local live staging in Liferay 7.1, in which I have one custom field in Web content. When I export those web content to local live, I want to check that custom field as result I would be export that web content.

So for that, I am extending doExportStagedModel in BaseStagedModelDataHandler as below.

@Component(immediate = true,service = {StagedModelDataHandler.class})
public class Demo extends BaseStagedModelDataHandler<JournalArticle> {

     // All the stuff


    @Override
    protected void doExportStagedModel(
            PortletDataContext portletDataContext, JournalArticle article)
        throws Exception {


          // overridden stuff
     }



     // Other stuff
}

When I am deploying this, I got below exception.

2018-11-20 04:04:12.669 ERROR The setJournalCreationStrategy method has thrown an exception java.lang.IllegalArgumentException: argument type mismatch

2018-11-20 04:04:12.850 ERROR The setJournalFeedExportImportContentProcessor method has thrown an exception java.lang.IllegalArgumentException: argument type mismatch

Does anybody having idea how can I do this proper way on this?