How to autowire spring-data CrudRepository - spring

Question

A bit of Details
I am having some problem while running the code given below. I am getting the following exception. When i am trying the sample code of [CrudRepository for Spring Data][1].
I have an Interface:
package com.joydeep.springboot;
import org.springframework.data.repository.CrudRepository;
import com.joydeep.springboot.vo.Message;
public interface Test1 extends CrudRepository<Message, String> { }
VO Class:
package com.joydeep.springboot.vo;
import java.util.Date;
import javax.persistence.Entity;
import javax.persistence.Id;
#Entity
public class Message {
#Id
private String id;
private String text;
private String author;
private Date created;
public Message() {
super();
}
public Message(String id, String text, String author, Date created) {
super();
this.id = id;
this.text = text;
this.author = author;
this.created = created;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public Date getCreated() {
return created;
}
public void setCreated(Date created) {
this.created = created;
}
}
Controller class:
package com.joydeep.springboot;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
#RestController
public class HelloCntrl {
#Autowired
Test1 test;
#RequestMapping("/hello")
public String sayHi(){
return "Hi";
}
}
Initializer class:
package com.joydeep.springboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class CourseAPIStarter {
public static void main(String[] args) {
SpringApplication.run(CourseAPIStarter.class);
}
}
pom.xml:
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>io.springboot</groupId>
<artifactId>rest-course-api</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Rest service course API</name>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.2.RELEASE</version>
</parent>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derby</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
</project>
Exception encountered during context initialization - cancelling refresh attempt:
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'helloCntrl': Unsatisfied dependency expressed through field 'test'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.joydeep.springboot.Test1' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations {#org.springframework.beans.factory.annotation.Autowired(required=true)}
The example i am referring is from this link.
https://spring.io/guides/gs/accessing-data-jpa/

Answer 1

You don't need to put #Repository annotation on Test1. Put these 3 annotation on your CourseAPIStarter class your application will run like hot knife in butter.
#ComponentScan(basePackages={"com.joydeep.springboot"})
#EntityScan(basePackages={"com.joydeep.springboot.vo"})
#EnableJpaRepositories(basePackages={"com.joydeep.springboot"})
#ComponentScan will scan your objects, and will register them with Spring.
#EnableJpaRepositories will enable all your Spring JPA repositories to be used in your application.
#EntityScan: As you added #Entity annotation on your model object class, Spring will assume that a table will exists with name Message. So to register this class with Spring as Entity you need to use this annotation.

Answer 2

Spring can't find Test1 bean because you forgot to annotate it with #Repository. You can autowire only Spring managed classes (Controller, Component, Repository, Service ecc).
Try with this:
#Repository
public interface Test1 extends CrudRepository<Message, String> { }