UnsatisfiedDependencyException: Error creating bean with name 'homeController': Unsatisfied dependency expressed through field 'userDAO' - spring

Question

I am trying to connect backend and frontend two separate projects of eclipse spring maven. I have added dependency to do so. But when I write down validate credentials logic in Homecontroller.java, after running on server its showing this exception. Please help to resolve it I have tried many methods already please suggest.
HomeController.java
package com.yogesh.shoponlinefrontend.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Required;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import com.yogesh.shoponlineback.dao.UserDAO;
import com.yogesh.shoponlineback.model.User;
#Controller
public class HomeController {
#Autowired
UserDAO userDAO;
#RequestMapping("/")
public String homePage() {
System.out.println("Executing the method homePage");
return "home";
}
#RequestMapping("/login")
public ModelAndView showLoginPage() {
ModelAndView mv = new ModelAndView("home");
mv.addObject("msg", "You clicked login link");
mv.addObject("showLoginPage", "true");
return mv;
}
#RequestMapping("/register")
public ModelAndView showRegistrationPage() {
ModelAndView mv = new ModelAndView("home");
mv.addObject("msg", "You clicked Registration link ");
mv.addObject("showRegistrationPage", "true");
return mv;
}
#RequestMapping("/validate")
public ModelAndView validate(#RequestParam("id") String id, #RequestParam("password") String pwd) {
System.out.println("In validate method");
System.out.println("id: " + id);
System.out.println("pwd: " + pwd);
ModelAndView mv = new ModelAndView("home");
if (userDAO.validate(id, pwd) != null) {
mv.addObject("successMsg", "You logged in successfully");
} else {
mv.addObject("errorMsg", "Invalid Credentials..Please try again");
}
return mv;
}
}
UserDAO.java
package com.yogesh.shoponlineback.dao;
import java.util.List;
import com.yogesh.shoponlineback.model.User;
public interface UserDAO {
public List<User> list();
public User get(String username);
public User validate(String username, String password);
public boolean save(User user);
public boolean update(User user);
}
User.java
package com.yogesh.shoponlineback.model;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import org.hibernate.validator.constraints.NotEmpty;
import org.springframework.stereotype.Component;
#Entity
//cha
#Table(name="USER")
#Component
public class User {
#Id
private String username;
#NotEmpty(message = "please enter your name")
private String name;
#Min(5)
#Max(15)
private String password;
private String mobile;
private String role;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getMobile() {
return mobile;
}
public void setMobile(String mobile) {
this.mobile = mobile;
}
public String getRole() {
return role;
}
public void setRole(String role) {
this.role = role;
}
}
UserDAOImpl.java
package com.yogesh.shoponlineback.daoimpl;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.yogesh.shoponlineback.dao.UserDAO;
import com.yogesh.shoponlineback.model.User;
#Service
#Repository()
public class UserDAOImpl implements UserDAO {
#Autowired
UserDAO userDAO;
#Autowired
private SessionFactory sessionFactory;
public UserDAOImpl(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
public UserDAOImpl() {
// TODO Auto-generated constructor stub
}
#Transactional
public List<User> list() {
String hql = "from User";
Query query = sessionFactory.getCurrentSession().createQuery(hql);
return query.list();
}
#Transactional
public User get(String username) {
return (User) sessionFactory.getCurrentSession().get(User.class, username);
}
#Transactional
public User validate(String username, String password) {
String hql = "from User WHERE username ='" + username + "' and password='" + password + "'";
Query query = sessionFactory.getCurrentSession().createQuery(hql);
return (User)query.uniqueResult();
}
#Transactional
public boolean save(User user) {
try {
sessionFactory.getCurrentSession().save(user);
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
#Transactional
public boolean update(User user) {
try {
sessionFactory.getCurrentSession().update(user);
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
}
:::::::::::::::::::::::::::::Exception trace::::::::::::::::::::::::::::::::::
INFO: FrameworkServlet 'dispatcher': initialization started
Jan 10, 2017 3:19:22 PM **org.springframework.web.context.support.AnnotationConfigWebApplicationContext prepareRefresh
INFO: Refreshing WebApplicationContext for namespace 'dispatcher-servlet': startup date [Tue Jan 10 15:19:22 IST 2017]; root of context hierarchy
Jan 10, 2017 3:19:22 PM org.springframework.web.context.support.AnnotationConfigWebApplicationContext loadBeanDefinitions
INFO: Registering annotated classes: [class com.yogesh.shoponlinefrontend.config.AppConfig]
Jan 10, 2017 3:19:23 PM org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor <init>
INFO: JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
Jan 10, 2017 3:19:23 PM org.springframework.web.context.support.AnnotationConfigWebApplicationContext refresh
WARNING: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'homeController': Unsatisfied dependency expressed through field 'userDAO'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.yogesh.shoponlineback.dao.UserDAO' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
Jan 10, 2017 3:19:23 PM org.springframework.web.servlet.DispatcherServlet initServletBean
SEVERE: Context initialization failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'homeController': Unsatisfied dependency expressed through field 'userDAO'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.yogesh.shoponlineback.dao.UserDAO' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:592)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:370)
at `enter code here`org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1219)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:551)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:754)
at** org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)
at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668)
at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:540)
at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:494)
at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
at javax.servlet.GenericServlet.init(GenericServlet.java:158)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1183)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:992)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4903)

Answer 1

I have updated to this:
#ComponentScan(basePackages = "com.yogesh.shoponlinefrontend,com.yogesh.shoponlineback")
from
#ComponentScan(basePackages = "com.yogesh.shoponlinefrontend)
and it's now working fine.

Answer 2

I had the same problem! My POM file was configured incorrectly.
Check your dependencies (versions).
THis configuration works for me.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.stoliarenko</groupId>
<artifactId>CustomerTracker</artifactId>
<version>0.0.1-SNAPSHOT</version>
<!-- <version>1.0-SNAPSHOT</version>-->
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<packaging>war</packaging>
<properties>
<failOnMissingWebXml>false</failOnMissingWebXml>
<spring.version>5.1.0.RELEASE</spring.version>
<hibernate.version>5.3.5.Final</hibernate.version>
<hibernate.validator>5.4.1.Final</hibernate.validator>
<c3p0.version>0.9.5.2</c3p0.version>
<jstl.version>1.2.1</jstl.version>
<tld.version>1.1.2</tld.version>
<servlets.version>3.1.0</servlets.version>
<jsp.version>2.3.1</jsp.version>
<hsqldb.version>1.8.0.10</hsqldb.version>
</properties>
<dependencies>
<!-- Spring MVC Dependency -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- Spring ORM -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- Hibernate Core -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.2.17.Final</version>
</dependency>
<!-- Hibernate Validator -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>${hibernate.validator}</version>
</dependency>
<!-- JSTL Dependency -->
<dependency>
<groupId>javax.servlet.jsp.jstl</groupId>
<artifactId>javax.servlet.jsp.jstl-api</artifactId>
<version>${jstl.version}</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>${tld.version}</version>
</dependency>
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${servlets.version}</version>
<scope>provided</scope>
</dependency>
<!-- JSP Dependency -->
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>${jsp.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
</dependencies>
</project>