Debugging the GWT application running in maven, version 2.11

Recently I got a project on GWT. Had no idea what is this thing. Slowly figured out things here and there. There aren't many sources to lean from. I mostly went through ChatGPT and took help from it. It made me a demo project for login page, sign up page and connecting it to the mysql database. I worked on client-side, server-side and shared files.

In this project I made login page, sign up page, user entity, user service, user service async, user service implementation. As of now my frontend is working fine but can't able to connect it to the database. I am using Intellij Idea Ultimate version, and there is no way I can debug this code. 

Will this community help me to figure this out by sharing resources and you thoughts about this demo project. It's my third day working on this task, and I can't see things moving. I really need your suggestions guys,  if needed can share my code in zip file.

Also how can I debug this?

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