Recently, there was an error when working with the spring boot framework:

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2018-05-08 10:11:20.975 ERROR 11344 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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APPLICATION FAILED TO START
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Description:

Cannot determine embedded database driver class for database type NONE

Action:

If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (no profiles are currently active).


Process finished with exit code 1

Several methods of searching on the Internet have no effect, on the contrary, new errors appear
later, when I checked carefully, I found that my controller package and application package are in parallel position

But in fact, the controller package must be scanned in the application package to run the program normally, so as long as you move the controller package into the application package, there will be no error