Why is my configuration test class not working? - spring

Question

I am trying to write unit test using junit for my service configuration class. I have existing code that works in other module, but it doesn't work on this module for some reason and I cannot figure this out. Here is my code:
ServiceConfig class:
package config.service;
import service.Service;
import service.ServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
#Configuration
public class ServiceConfig {
#Autowired
private Service service;
#Bean
public Service service() {
return new serviceImpl();
}
}
Service interface:
package service;
public interface Service {
void search() throws Exception;
}
ServiceImpl class:
package service;
public class ServiceImpl implements Service {
#Override
public void search() throws Exception {
return null;
}
}
ServiceConfigTest class:
package config.service;
import service.Service;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringRunner;
import static org.junit.Assert.assertNotNull;
#RunWith(SpringRunner.class)
#ContextConfiguration(classes = { ServiceConfig.class })
public class ServiceConfigTest {
#Autowired
private Service service;
#Test
public void service() {
assertNotNull(service);
}
}
and here is the Exception:
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'ServiceConfig': Unsatisfied dependency expressed through field 'Service'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.nuance.powershare.dispatchreporter.service.Service' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
I don't have too much experience with spring and configuration classes. However, this seems legit to me, I basically followed the code that was already working in other module. My manager also cannot find what is wrong.

Answer 1

The above exception is caused, when we did not create a bean of the type it will raise an exception "Error creating bean with name 'className'.
I tried the same code it's working for me. However, you don't need to create Service Config to create a bean of ServiceImpl just annotate ServiceImpl with #Service and you can test it subsequently.
#Service
public class ServiceImpl implements Service {
#Override
public void search() throws Exception {
}
}
and avoid using the predefined names(ex: Service) for the class name.