CODEWITHSUNDEEP
springapi
mvantastic
mvantastic

Reputation: 57

CommandLineRunner required a bean that could not be found

I'm new to making APIs and Spring in general.

I'm trying to use CommandLineRunner in order to populate my repository but it says that it cannot find the required bean that I put in the parameter.

@SpringBootApplication
public class DemoApplication {

    private static final Logger logger = LoggerFactory.getLogger(DemoApplication.class);

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }


    @Bean
    public CommandLineRunner initializeDB(StudentRepository studentRepository){
        return (args)->{
            studentRepository.save(new Student("John1", "Doe1", "asdasda1","Comp Sci1",21));
            studentRepository.save(new Student("John2", "Doe2", "asdasda2","Comp Sci2",22));
            studentRepository.save(new Student("John3", "Doe3", "asdasda3","Comp Sci3",23));
            studentRepository.save(new Student("John4", "Doe4", "asdasda4","Comp Sci4",24));
            studentRepository.save(new Student("John5", "Doe5", "asdasda5","Comp Sci5",25));
            studentRepository.save(new Student("John6", "Doe6", "asdasda6","Comp Sci6",26));
            logger.info("The sample data has been generated");
        };
    }
}

That is my application class and below is my repository class.

import org.springframework.data.jpa.repository.JpaRepository;

import com.example.model.Student;

public interface StudentRepository extends JpaRepository<Student, Integer> {
}

Is there a basic thing that I am missing? Thanks in advance

Upvotes: 2

Views: 2467

Answers (2)

so-random-dude
so-random-dude

Reputation: 16465

Easiest and wise thing to do

DemoApplication (or whichever class annotated with @SpringBootApplication) should reside at the root of the package structure

That means, for any other classes for which you want spring to manage it's bean's lifecycle, move that to a (sub)package of DemoApplication.

In other words, if your DemoApplication is in a package src/main/java/com/yourorg then StudentRepository should be in a (sub)package of src/main/java/com/yourorg

Upvotes: 3

dunni
dunni

Reputation: 44515

If the application class is not in a super package as the other classes, you have to specify all packages in the SpringBootApplication, which should be scanned (for component scanning, Spring Data repositories etc.).

@SpringBootApplication(scanBasePackages= {"package1", "package2"})

or for a typesafe approach

@SpringBootApplication(scanBasePackageClasses = {ClassFromPackage1.class, ClassFromPackage2.class})

Alternatively move all packages to a subpackage of the application class package, so that all the default mechanisms take place.

Upvotes: 2

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