PDF generation in RHPAM and REST request with file attached

Good day dear Red Hat community,

I'm relatively new to RHPAM and would like to make it clear about some newbie questions i've got during exploring this tool.

I would like to know what is the good path to implement PDF generatation, i have tried this guide https://www.javatpoint.com/java-create-pdf but end up being terrorized by import exceptions such as : java.io.IOException cannot be resolved to a variable etc. Also tried this one https://www.baeldung.com/java-pdf-creation which for me is kinda complicated to understand.

The next question is, i have installed RESTWorkItemHanlder to my project, succesfully executed call and got response, but now, i need to attach PDF to it, so the rest call could send files with Content-Disposition: form-data; or is there any other way? Let me know in the answers please, thank you!