Spring Boot Error: No qualifying bean of type 'com.cao.springmvc.service.ProductsService' available

This error message indicates that Spring cannot find a bean of type 'com.cao.springmvc.service.ProductsService' to autowire into the dependent class.

To fix this issue, you can try the following steps:

1. Make sure that the 'ProductsService' class is annotated with the appropriate annotation to be detected as a Spring bean, such as @Service, @Component, or @Repository.

2. Check if the 'ProductsService' class is being scanned by the component scan configuration. Make sure that the package containing the 'ProductsService' class is included in the component scan base package(s).

3. If the 'ProductsService' class has any dependencies, ensure that they are also annotated correctly and are being scanned by the component scan configuration.

4. If you have multiple implementations of the 'ProductsService' interface, you may need to use the @Qualifier annotation to specify which implementation to autowire. Add the @Qualifier annotation to the dependency injection point, specifying the desired bean name.

5. If you are using XML configuration, make sure that you have included the correct XML configuration file and that the 'ProductsService' bean is defined in it.

6. Check for any typos or misspellings in the class names, package names, or annotations.

If none of the above steps resolve the issue, please provide more details about your project setup and configuration, including code snippets and any relevant error logs, so that we can assist you further.