在 spring 引导测试中注入资源依赖项失败

Question

The following relevant signatures I've defined below. I'm running an integration test of mine and getting this failure:

Error:

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'consumerService': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'CoolTransformer' available

I assume the context is being loaded as I target the config class. What could I be missing? I have a service annotation with a name on the service that is failing to load.. I've tried autowired as well with a qualifier.

@ExtendWith({SpringExtension.class})
@SpringBootTest(classes = ConsumerService.class)
@ContextConfiguration(classes = {MyCoolConfig.class})
public class EventDecomposerIntegrationTest

@Service("CoolTransformer")
public class CoolTransformer extends BaseTransformer<GraphComponents> {

@Service
public class ConsumerService {

  @Resource(name = "CoolTransformer")
  private BaseTransformer coolTransformer;

@Configuration
public class MyCoolConfig {

  @Value("${spring.kafka.bootstrap-servers}")
  private String bootstrapServers;

  @Value("${spring.kafka.schema-registry}")
  private String schemaRegistry;

  @Bean
  public Map<String, Object> consumerConfigs() {
    Map<String, Object> props = new HashMap<>();

    return props;
  }

  @Bean
  public ConsumerFactory<String, String> consumerFactory() {
    return new DefaultKafkaConsumerFactory<>(consumerConfigs());
  }

  @Bean
  public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, String>>
      kafkaListenerContainerFactory() {
    ConcurrentKafkaListenerContainerFactory<String, String> factory =
        new ConcurrentKafkaListenerContainerFactory<>();
    factory.setConsumerFactory(consumerFactory());
    factory.getContainerProperties().setAckMode(ContainerProperties.AckMode.MANUAL_IMMEDIATE);
    factory.getContainerProperties().setMissingTopicsFatal(false);
    return factory;
  }
}

Answer 1

Something needs to tell Spring where to find your @Service beans in order to wire them up. You have told Spring how to find your ConsumerService bean via

@SpringBootTest(classes = ConsumerService.class)

and you told Spring how to find MyCoolConfig via

@ContextConfiguration(classes = {MyCoolConfig.class})

But there is nothing telling Spring how to find CoolTransformer .

One way to accomplish this is with a @ComponentScan annotation. That annotation typically goes on a @Configuration bean, so you might put it on MyCoolConfig with a package to scan, like so:

@Configuration
@ComponentScan("com.foo")
public class MyCoolConfig {

As long as CoolTransformer is somewhere under the com.foo package, Spring will find it and wire it up.

If ConsumerService is also under com.foo , it will also get scanned, so you don't need to specify it either.

Finally, since MyCoolConfig is now the entrypoint to all your other beans, you can simplify your integration test's annotations to:

@ExtendWith({SpringExtension.class})
@SpringBootTest(classes = MyCoolConfig.class)
public class EventDecomposerIntegrationTest