Here is the screen shot of the property I set for _pagezerocontent. The value I set was Please view this in adobe acrobat or reader. This is page zero property . This can be set by opening the xdp in designer and go to Form -> Properties Suggest you start with a simple message then work your way toward the message that you want The pdf I used can be downloaded from here

I have form data model that fetches countries/ states from external web sitei will send you that one soon

i uploaded a demo of my samplehttps://youtu.be/7czI_DJNLXIif this is what you are looking for, I can send you the package

Let me find a sample for you 

Let me see if I have something for this use case

i just included the DevelopingWithServiceUSer.jar in my project and was able to get everything workingimport com.mergeandfuse.getserviceuserresolver.GetResolver; @referenceGetResolver getResolver; ResourceResolver rr = getResolver.getFormsServiceResolver(); my eclipe project

Did you configure your Assign Task as shown below?  

in your project's POM.xml file add the followingcom.day.cqserviceuser1.0bundlesystemC:\AEMFormsBundles\DevelopingWithServiceUser.jarThe systemPath value will depend on the location of the DevelopingWithServiceUSer.jar on your file system. Update the project and then you should be good to go