No qualifying bean of type available in SpringBoot Application

When running my SpringBoot application, I am getting this error:

An exception occurred while running. null: InvocationTargetException: Error creating bean with name 'bookController': Unsatisfied dependency expressed through field 'bookRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.example.experimental001.Repositories.BookRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} -> [Help 1]

I have read through many posts regarding this error but none of them seem to fix my problem.

I have tried adding the @Controller annotation but it doesn't seem to fix the bean problem.

Controller:

@RestController
@RequestMapping("/api/books")
public class BookController {

    @Autowired
    private BookRepository bookRepository;

    @GetMapping
    public Iterable findAll() {
        return bookRepository.findAll();
    }

    @GetMapping("/title/{bookTitle}")
    public List findByTitle(@PathVariable String bookTitle) {
        return bookRepository.findByTitle(bookTitle);
    }

    @GetMapping("/{id}")
    public Book findOne(@PathVariable Long id) {
        return bookRepository.findById(id)
                .orElseThrow(() -> new BookNotFoundException("Book not found", null));
    }

    @PostMapping
    @ResponseStatus(HttpStatus.CREATED)
    public Book create(@RequestBody Book book) {
        return bookRepository.save(book);
    }

    @DeleteMapping("/{id}")
    public void delete(@PathVariable Long id) {
        bookRepository.findById(id).orElseThrow(() -> new BookNotFoundException("Book not found", null));
        bookRepository.deleteById(id);
    }

    @PutMapping("/{id}")
    public Book updateBook(@RequestBody Book book, @PathVariable Long id) {
        if (book.getId() != id) {
            throw new BookIdMismatchException("error");
        }
        bookRepository.findById(id).
                orElseThrow(() -> new BookNotFoundException("Book not found", null));
        return bookRepository.save(book);
    }
}

Simple Controller:

@Controller
public class SimpleController {
    @Value("${spring.application.name}")
    String appName;
    @GetMapping("/")
    public String homePage(Model model) {
        model.addAttribute("appName", appName);
        return "home";
    }
}

Repository:

@EnableJpaRepositories
@Repository

public interface BookRepository extends CrudRepository<Book, Long> {
    public List<Book> findByTitle(String title);
}

Pom:

<properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

Application File:

@SpringBootApplication
@ComponentScan(basePackages = BookRepository)

public class Application {

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

You might need to add the following to the main app class:

@ComponentScan(basePackages = "Package where the repository is located”)

Looks like your repository is in a different packer and spring context is not able to pick it up when starting up.

Please refer this doc: https://www.baeldung.com/spring-component-scanningfor