Java – spring application startup error: source cannot be empty

I'm following the spring tutorial and the following error occurred when I tried to start the spring application:

What is the "source cannot be empty" error@ H_ 419_ 6@

I am using the eclipse Maven project for this tutorial project, and I have updated the project I have also cleaned up and rebuilt, but I still encountered this error@ H_ 419_ 6@

Solution

It turns out that I didn't set up the main classes - debug and run configuration correctly in eclipse I will go to org springframework. boot. Spring application is set as the main class The main class should point to my main class