The build Spring Cloud project could not find the application class __spring

Build Spring Cloud Project cannot find application class

When you first build a cloud project for spring, there is no problem with running the same day, and when you run again the next day, you suddenly burst out of the application error, causing the compilation to pass, the solution is to the project's root directory, the directive:
1.MVN clean, dispose target
2.MVN compile, recompiling
3.MVN Package, repackaging
Then, when you rerun the application class, there is no compile error that cannot be found for the class.
I'm using eclipse, and this problem is mainly caused by the compiler.