AEM forms jee is Livecycle+AEM forms on OSGI which is deployed as an war file to run inside the application server.
The database is for the livecycle part and crx is for the AEM part
This article has sample code and package that is ready to use
https://experienceleague.adobe.com/docs/experience-manager-learn/forms/document-services/output-and-forms-services-article-develop.html?lang=en#
https://forms.enablementadobe.com/content/dam/formsanddocuments/summaryscreen/jcr:content?wcmmode=disabled
This uses out-of-the-box API to display the form data for review before submitting