No qualifying bean of type available in SpringBoot Application - spring

Question

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);
}
}

Answer 1

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