It depends on the customer, will they give you a server dedicated for your Java framework so you can handle at maximum 5 POST request per day or will day give you access to the existing website they have for the company, that already has PHP,mysql installed. Honestly you are not doing the fair thing for the customer if you ask for a new server because you want to use your prefered tool and not the best thing for this job.

Btw my scenario was about sending feedback ro stack traces, this are just text, no giant file uploads and nothing insecure about it.