Spring Autowiring not working - BeanCreationException - spring

Question

I want to integrate Spring with Hibernate. I am new to both technologies. At the moment I get an error like this:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'homeController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: public service.UserService controller.HomeController.userService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [service.UserService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
Can anybody help me, please?
package controller;
#Controller
public class HomeController {
#Autowired
private UserService userService;
#RequestMapping("/register")
public ModelAndView getRegisterForm(#ModelAttribute("user") User user,
BindingResult result) {
ArrayList<String> gender = new ArrayList<String>();
gender.add("Male");
gender.add("Female");
ArrayList<String> city = new ArrayList<String>();
city.add("Delhi");
city.add("Kolkata");
city.add("Chennai");
city.add("Bangalore");
Map<String, Object> model = new HashMap<String, Object>();
model.put("gender", gender);
model.put("city", city);
System.out.println("Register Form");
return new ModelAndView("Register", "model", model);
}
#RequestMapping("/saveUser")
public ModelAndView saveUserData(#ModelAttribute("user") User user,
BindingResult result) {
userService.addUser(user);
System.out.println("Save User Data");
return new ModelAndView("redirect:/userList.html");
}
#RequestMapping("/userList")
public ModelAndView getUserList() {
Map<String, Object> model = new HashMap<String, Object>();
model.put("user", userService.getUser());
return new ModelAndView("UserDetails", model);
}
}
package service;
#Service
public class UserServiceImpl implements UserService {
#Autowired
UserDao userDao;
#Override
public void addUser(User user) {
userDao.saveUser(user);
}
#Override
public List<User> getUser() {
return userDao.getUser();
}
}
spring-servlet Code:
Hi need a Spring ,Hibernate integration example for my new project.so i have copied this from a website.and i did some modifications in that ..It's not working please help me
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
<context:property-placeholder location="classpath:jdbc.properties" />
<context:component-scan base-package="controller" />
<tx:annotation-driven/>
<bean id="jspViewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/view/" />
<property name="suffix" value=".jsp" />
</bean>
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${database.driver}" />
<property name="url" value="${database.url}" />
<property name="username" value="${database.user}" />
<property name="password" value="${database.password}" />
</bean>
<bean id="myydao" class="dao.UserDaoImpl">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
<bean name="/user/*.htm" class="controller.HomeController" >
<property name="UserDao" ref="mydao" />
</bean>
<bean id="hibernateTransactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
</beans>

Answer 1

I assume that you haven't added the bean to your Spring Application Context
If you are using xml, you need to do this by adding something like the following to the xml file:
<bean class="service.UserServiceImpl" id="userService"/>
Or, if you are using a Java based configuration class, you need to add a bean like so:
#Configuration
public class AppConfig{
#Bean
public UserService userService() {
return new UserServiceImpl();
}
}
Or, if you add the #Component annotation to UserServiceImpl and #ComponentScan("service") annotation to the Java App config, it should pick up the User service

Answer 2

Make sure you have enabled the component scanning to automatically detect classes and register respective beans.
You should add below entry to your bean definition XML file:
<context:component-scan base-package="org.example"/>
More about automatic bean detection