can not resolve simbol @restcontroller

The "@RestController" annotation is part of Spring Framework and is used to indicate that the class is a RESTful web service. If you are getting a "cannot resolve symbol" error for this annotation, it means that your project is not set up correctly to use Spring Framework.

To resolve this issue, make sure that you have added the necessary Spring Framework dependencies to your project's build file (e.g. Maven or Gradle). You will also need to make sure that your project's configuration files are properly configured to use Spring Framework, including any necessary annotations or configuration properties.

If you are still having trouble, it may be helpful to consult Spring Framework documentation or seek assistance from the Spring community.