Servlet object, doPost() and doGet() methods

Hi there, this is my second post.

I’ve got an issue trying to transport an object from a tablet’s database (Android) into a database which is in a server.
I’ve tried to create a servlet from the first App (here Android Studio), to transfer the data to the Vaadin App (in Eclipse).
I’ve first tried this on a basic servlet on Eclipse and it worked, I’ve succeeded in getting the right object.
Yet by trying it with the Vaadin App, it doesn’t work. I’m still new to Vaadin and I’ve looked about it a lot on the web. But I can’t find the answers I’m looking for, maybe I’m not searching in the right place or whatever…

Anyway, I can’t make it work, using VaadinWebServlet, it’s like the doPost() and the doGet() functions are never called… If someone has an idea, I’ll be grateful ! I can share the code too if it helps.

I’ve tried looking at the Vaadin Book, but even though I’m pretty good in English, I’m a bit lost inside it.

Thank you !