#Autowired annotation in spring - spring

Question

i am relatively new in spring and i have problems with understanding fundamentals of spring mvc..
My controller
#Controller
public class HomeController {
private ContactManager contactManager;
#Autowired
public void setContactManager(ContactManager contactManager) {
this.contactManager = contactManager;
}
#RequestMapping(value="/")
public ModelAndView listContact(ModelAndView model) throws IOException {
List<Contact> listContact = contactManager.list();
model.addObject("listContact", listContact);
model.setViewName("home");
return model;
}
...
Contact ManagerImpl, and implementation of interface method
public class ContactManagerImpl implements ContactManager {
private DataSource dataSource;
private JdbcTemplate jdbcTemplate;
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
this.jdbcTemplate = new JdbcTemplate(dataSource);
}
...
ContactManager
public interface ContactManager {
public void saveOrUpdate(Contact contact);
public void delete(int contactId);
public Contact get(int contactId);
public List<Contact> list();
}
And root-context.xml
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/test"/>
<property name="username" value="root"/>
<property name="password" value="sec"/>
</bean>
<bean id="managmentService" class="spring.contact.impl.model.ContactManagerImpl">
<property name="dataSource" ref="dataSource"/>
</bean>
My problem is that i get error:
org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of
type [spring.contact.api.ContactManager] found for dependency: expected at least 1
bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}
And of course the problem is with #Autowired annotations. How can i fix it ? When i removed #Autowired annotations i get another error: NullPointerException (manager in HomeController).

Answer 1

Your Controller should be..
#Controller
public class HomeController {
#Autowired
#Qualifier("managmentService")
private ContactManager contactManager;
#RequestMapping(value="/")
public ModelAndView listContact(ModelAndView model) throws IOException {
List<Contact> listContact = contactManager.list();
model.addObject("listContact", listContact);
model.setViewName("home");
return model;
}
...
In your configuration add also <context:annotation-config />that is used in order to be able to use #Autowired annotation.
An example of <context:annotation-config />
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:annotation-config/>
<!-- bean definitions go here -->
</beans>

Answer 2

Move the #Autowired annotation to the declaration for ContactManager.
You won't need the setter, delete it.