Spring No matching bean of type … found for dependency: expected at least 1 bean

Question

I have trouble with matching bean. My project is based on the project from "Spring in action"

No matching bean of type [com.kmazur.data.BoardRepository] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'boardController' defined in file [C:\Users\lenovo\Documents\workspace-sts-3.8.4.RELEASE\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\MVCWebApi\WEB-INF\classes\com\kmazur\web\BoardController.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [com.kmazur.data.BoardRepository]: : No matching bean of type [com.kmazur.data.BoardRepository] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.kmazur.data.BoardRepository] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}

And servlet-context.xml

<!-- DispatcherServlet Context: defines this servlet's request-processing 
    infrastructure -->

<!-- Enables the Spring MVC @Controller programming model -->
<annotation-driven />

<!-- Handles HTTP GET requests for /resources/** by efficiently serving 
    up static resources in the ${webappRoot}/resources directory -->
<resources mapping="/resources/**" location="/resources/" />

<!-- Resolves views selected for rendering by @Controllers to .jsp resources 
    in the /WEB-INF/views directory -->
<beans:bean
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <beans:property name="prefix" value="/WEB-INF/views/" />
    <beans:property name="suffix" value=".jsp" />
</beans:bean>



<context:component-scan base-package="com.kmazur.*" />

web.xml

<!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/spring/root-context.xml</param-value>
</context-param>

<!-- Creates the Spring Container shared by all Servlets and Filters -->
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<!-- Processes application requests -->
<servlet>
    <servlet-name>appServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>appServlet</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

Classes

public interface BoardRepository {

List<Board> findUsers(long max, int count);

Board findOne(long boardId);
}

And

public class Board {
private final Long id;
private final String message;
private final Date time;
private Double latitude;
private Double longitude;

Controller

@Controller
@RequestMapping("/boards")
public class BoardController {

private static final String MAX_LONG_AS_STRING = "9223372036854775807";


private BoardRepository boardRepository;


@Autowired
public BoardController(BoardRepository boardRepository) {
    this.boardRepository = boardRepository;
}

I have already tried adding adnotation in different ways, but the error was always the same.

Answer 1

I would change the repo to:

public interface BoardRepository extends JpaRepository<Board,Long>{
//Methods here
}

And annotate the declaration:

@Autowired
private BoardRepository boardRepository;

And let Spring know where to look:

<jpa:repositories base-package="com.repositories" /> 

(If BoardRepository was defined in com.repositories package)

Answer 2

i haven't read this book, but it looks like spring data, for example . They also create interface without imtplementation.