Your ApplicationContext is unlikely-to-start due to a @ComponentScan of the default package

1, in the construction of Springboot framework encountered problems.

* * WARNING *: Your ApplicationContext is unlikely-to-start due to a @ComponentScan of the default package.

Warning: Your app context might not start because you added the annotations to the default package. There is also a sentence in the following stack message that includes this meaning.

...... This can also happen if is @ComponentScanning a springframework package (e.g. if you put a @ComponentScan in the DEFA Ult package by mistake).

(There are other errors when you start, but only the errors associated with this are extracted.) ）

2. My project structure is like this (I built the application file in the Java folder below)

3. Reason Analysis

I'm not using @componentscanning annotations, why is there such an annotation?

Springboot when writing the startup class (the class where the Main method resides), if you do not use @componentscan to indicate the object scan scope, the default is to scan the object in the package that contains the current startup class.

(Note: I did not add @componentscan annotations when I wrote the Main method, so that he would scan the objects in the package where application is located)
If the current startup class does not have a package, it will get an error at startup: Your ApplicationContext is unlikely to start due to a @ComponentScan of the default packages.

(Note: The application class that is written in the Java folder is not subordinate to any one package, so the startup class does not have a package)

4. Solutions

Method One, the application is built under the other packages

Method Two, add @componentscan annotation on the application class, specify the package to be scanned

Reference documents

http://blog.csdn.net/u012834750/article/details/65942092

Your ApplicationContext is unlikely-to-start due to a @ComponentScan of the default package