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  1. I'm using Spring Boot and MongoDB to create a simple school application. I want to test the methods that are defined in the service class but I get the following exception:

    org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name'com.backintime.BackInTimeSpring.Service.TeacherServiceTest': Unsatisfied dependency expressed through field 'teacherService'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying     bean of type 'com.backintime.BackInTimeSpring.Service.TeacherService' available:     expected at least 1 bean which qualifies as autowire candidate. Dependency annotations:    {@org.springframework.beans.factory.annotation.Autowired(required=true)}

  2. My classes are the following:

  3. Repository:

    package com.backintime.BackInTimeSpring.Model.Repository;
@Component
@Repository
public interface ITeacherRepository extends MongoRepository<Teacher,String> {

@Query("{}")
Stream<Teacher> findAllTeachers();

List<Teacher> findByLastNameIgnoreCase(String lastName);
List<Teacher> findByFirstNameIgnoreCase(String firstName);

}

  4. Service:

    package com.backintime.BackInTimeSpring.Service;
@Component
@Service
public class TeacherService {
@Autowired
private ITeacherRepository teacherRepository;

public List<Teacher> retrieveAllTeachers(){
    return       this.teacherRepository.findAllTeachers().sorted(Comparator.comparing(Teacher::getLastName)).collect(Collectors.toList());
}
public Teacher retrieveTeachersById(String id) {
    return this.teacherRepository.findAllTeachers().filter(t -> t.getId().equals(id)).findFirst().get();
}
public List<Teacher> retrieveTeachersByLastName(String lastName){
    return this.teacherRepository.findByLastNameIgnoreCase(lastName);
}
public List<Teacher> retrieveTeachersByFirstName(String firstName){
    return this.teacherRepository.findByFirstNameIgnoreCase(firstName);
}
public void saveTeacher(Teacher t){
    this.teacherRepository.save(t);
}

public String greet() {
    return "Hello World";
}

    }

  5. Unittest:

    package com.backintime.BackInTimeSpring.Service;
@RunWith(SpringRunner.class)
@ComponentScan(basePackages = "com.backintime.BackInTimeSpring")
public class TeacherServiceTest {

@Autowired
TeacherService teacherService;
@Test
public void retrieveAllTeachers() {
    assertEquals(3, teacherService.retrieveAllTeachers().size());
}
Cœur
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Wat Als
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  • Can you try to annotate the bean with @Component and let us know if it worked? – OEH Dec 11 '18 at 11:00
  • Still the same error :( – Wat Als Dec 11 '18 at 11:39
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    Drop `@ComponentScan`. Replace with `@SpringBootTest`. Note the parameters to `@SpringBootTest` if you need to customize. Normally one would use the `classes` parameter to point it at your annotated main application class (the one with `@SpringBootApplication` on it). Also drop `@Component` on classes where you also have `@Service` because `@Service` imports `@Component`. – Andy Brown Dec 11 '18 at 15:23
  • Andy .. THANK YOU, that solved it for me. I'll edit the code – Wat Als Dec 12 '18 at 09:09

1 Answers1

1

This is happening due to the fact that you are using @ComponentScan in the wrong place.

Usually it is used in your Main Application class or in configuration classes not where you define the beans.

Please refer to this link: https://springframework.guru/spring-component-scan/

There is a similar question in here, and as you can see they are as well using @ComponentScan in the Main application

How to use @ComponentScan together with test-specific ContextConfigurations in SpringJunit4TestRunner?

OEH
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