There is a scenario in which I need to show data in reporting using external REST based web service which returns JSON data. Has anyone tried that? Or is there any tutorial around that?
This is now possible using Web Service Datasource
This Community project implement a Custom Datasource, built using the latest Custom Datasource framework (leveraging Data Adapters internally).
It is also working inside JasperReports Server:
You can use it to fill Query based Input Controls, as well as Ad Hoc Reporting (for Commercial version) using it through Topic.