make sure your main application class (StudentSystemApplication.java) has component scanning enabled for the correct base package. It should look like this:

@SpringBootApplication
@ComponentScan(basePackages = "com.connectingfrontandback")
public class StudentSystemApplication {
 public static void main(String[] args) {
    SpringApplication.run(StudentSystemApplication.class, args);
 }
}

Because @SpringBootApplication includes component scanning functionality that automatically detects annotations like @RestController, @Service, @Repository, and @Component. When these annotations are found, Spring creates and manages those classes as beans. However, this scanning only works within the package containing your main class and its sub-packages. So if your main application class is in a different package than your components, you need to explicitly add @ComponentScan(basePackages = "com.connectingfrontandback") to ensure Spring finds and manages all your annotated classes correctly.