i have spring boot application and i got following error

Question

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'personController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.DAO.PersonDAO com.controller.PersonController.personDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.DAO.PersonDAO] 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)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at com.example.DemoMvcApplication.main(DemoMvcApplication.java:18) [classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_79]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.7.0_79]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.7.0_79]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.7.0_79]

****Here Is My PersonController.java****

@Controller public class PersonController {

@Autowired 
public PersonDAO personDao;

@RequestMapping("/person")
public String getPerson(Model model){
    User p=new User();
    p.setUserName("user");
    p.setPassword("password");

    model.addAttribute("login", p);
    return "personview";
}

@RequestMapping(value="/userLogin",method=RequestMethod.POST)

public String Login(User objUser,ModelMap model){
    if(objUser.getUserName().equals("user")&&objUser.getPassword().equals("password")){
        model.put("userName", objUser.getUserName());
        System.out.println("in@@@@@@@@@");
        return "TestPage";
    }else{
        System.out.println("in@@@@@@@@@");
        model.put("Error", "Failed to Login");
        return "personview";
    }

}

 @RequestMapping("/create")
  @ResponseBody
  public String create(String firstName, String lastName,int age) {
    String userId = "";
    try {
      Person user = new Person(firstName,lastName,age);
// personDao.save(user); userId = String.valueOf(user.getId()); } catch (Exception ex) { return "Error creating the user: " + ex.toString(); } return "User succesfully created with id = " + userId; } }

**Here is My personDAO.java**
@Repository //@Qualifier("PersonDAO") @Component //@EnableAutoConfiguration public interface PersonDAO extends CrudRepository {

} 

Here is my Model

 @Entity @Table(name = "person") public class Person { @Id @GeneratedValue(strategy=GenerationType.AUTO) Integer id; String firstName; String lastName; int age;

public Integer getId() {
    return id;
}
public void setId(Integer id) {
    this.id = id;
}
public String getFirstName() {
    return firstName;
}
public void setFirstName(String firstName) {
    this.firstName = firstName;
}
public String getLastName() {
    return lastName;
}
public void setLastName(String lastName) {
    this.lastName = lastName;
}
public int getAge() {
    return age;
}
public void setAge(int age) {
    this.age = age;
}
public Person(String firstName, String lastName, int age) {
    super();
    this.firstName = firstName;
    this.lastName = lastName;
    this.age = age;
}
}

Here is my application.properties

spring.datasource.url=jdbc:mysql://localhost:3306/test 
spring.datasource.driver-class-name=com.mysql.jdbc.Driver 
spring.datasource.username=root spring.datasource.password=mysql 
spring.datasource.testWhileIdle = true
 spring.datasource.validationQuery = SELECT 1 spring.jpa.show-sql = true
 spring.jpa.hibernate.ddl-auto = update 
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy 
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

Answer 1

personDAO应该被声明为一个spring bean。你可以使用@component或@service annotations。否则你可以使用xml config来完成

Answer 2

确保在配置类中有“@EnableJpaRepositories”