Error: Field required a bean of type that could not be found. Consider defining a bean - spring

Question

While creating a spring boot application on Spring boot 1.5.9, I am getting below error message. Can any body please help? Thanks in advance.
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:: Spring Boot :: (v1.5.9.RELEASE)
2018-01-26 22:16:01.534 INFO 7176 --- [ main] com.myapp.MyAppApplication : Starting MyAppApplication on DESKTOP-29H8ALN with PID 7176 (F:\My_SpringBoot_WorkSpace_20_01_2018\MyApp\MyApp\target\classes started by Tanmoy in F:\My_SpringBoot_WorkSpace_20_01_2018\MyApp\MyApp)
2018-01-26 22:16:01.534 INFO 7176 --- [ main] com.myapp.MyAppApplication : No active profile set, falling back to default profiles: default
2018-01-26 22:16:01.590 INFO 7176 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext#61009542: startup date [Fri Jan 26 22:16:01 IST 2018]; root of context hierarchy
2018-01-26 22:16:02.889 INFO 7176 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 9001 (http)
2018-01-26 22:16:02.903 INFO 7176 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-01-26 22:16:02.904 INFO 7176 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.23
2018-01-26 22:16:03.075 INFO 7176 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-01-26 22:16:03.075 INFO 7176 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1490 ms
2018-01-26 22:16:03.238 INFO 7176 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2018-01-26 22:16:03.242 INFO 7176 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-01-26 22:16:03.243 INFO 7176 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-01-26 22:16:03.243 INFO 7176 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-01-26 22:16:03.243 INFO 7176 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-01-26 22:16:03.277 WARN 7176 --- [ main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'customerController': Unsatisfied dependency expressed through field 'customerService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'customerService': Unsatisfied dependency expressed through field 'customersRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.myapp.repository.CustomersRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
2018-01-26 22:16:03.278 INFO 7176 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2018-01-26 22:16:03.311 INFO 7176 --- [ main] utoConfigurationReportLoggingInitializer :
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2018-01-26 22:16:03.396 ERROR 7176 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
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APPLICATION FAILED TO START
***************************
Description:
Field customersRepository in com.myapp.service.CustomerService required a bean of type 'com.myapp.repository.CustomersRepository' that could not be found.
Action:
Consider defining a bean of type 'com.myapp.repository.CustomersRepository' in your configuration.
I am using this settings:
Spring Boot 1.5.9
Oracle 11g database.
Please find the below classes I am using along with the pom.xml:
<?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.tanmoy</groupId>
<artifactId>MyApp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>MyApp</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<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-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
<exclusions>
<exclusion>
<artifactId>hibernate-entitymanager</artifactId>
<groupId>org.hibernate</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>12.1.0.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Java code - application:
package com.myapp;
import javax.transaction.Transactional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import com.myapp.entity.Customers;
import com.myapp.repository.CustomersRepository;
import com.myapp.service.CustomerService;
#SpringBootApplication
public class MyAppApplication {
public static void main(String[] args) {
SpringApplication.run(MyAppApplication.class, args);
}
#Bean
public CommandLineRunner demo(CustomersRepository repository) {
return (args) -> {
// fetch all customers
for (Customers customer : repository.findAll()) {
}
};
}
}
Java code - repository:
package com.myapp.repository;
import java.util.List;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
import com.myapp.entity.Customers;
#Repository
public interface CustomersRepository extends CrudRepository<Customers, Integer> {
#Query("select * from customers")
public List<Customers> getAllCustomerts();
}
Java code - service:
package com.myapp.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.myapp.repository.CustomersRepository;
#Service
public class CustomerService {
#Autowired
CustomersRepository customersRepository;
public void getAllCustomers() {
System.out.println(customersRepository.findAll());
}
}

Answer 1

Remove the #Repository annotation from CustomersRepository.
The interface CrudRepository is already registered in Spring's container and it can be injected already (also its child interfaces).

Answer 2

I think there is more in the exception stacktrace which was not shared, I think exception will point to incorrect query. The query in CustomersRespository should be like below:
#Query("select c from Customers c")
public List<Customers> getAllCustomerts();

Answer 3

Why are you defining a getAllCustomers in the repository if you never use it?
The CrudRepository already gives you for free some useful method implementations without you having to write a single line of code besides the interface declaration.
My suggestion is to remove the getAllCustumers in repository and call findAll on the repository from the service.

Answer 4

#Autowired
CustomersRepository customersRepository;
This is not the proper way to Autowire. This is:
CustomersRepository customersRepository;
#Autowire
public defaultConstructor(CustomerRepository customerRepository){
this.customerRepository = customerRepository;
}
note: defaultConstructor is simply your class name (default constructor).