问题描述
我有一个包含多个模块(父、服务、updater1、updater2)的多模块 maven 项目。 @SpringBootApplication 位于“服务”模块中,其他模块没有工件。
'updater1' 是一个模块,它有一个 Kafka 监听器和一个 http 客户端,当接收到一个 kafka 事件时会向外部 API 发出请求。我想使用 testcontainers
在此模块中创建集成测试,因此我创建了容器和 Kafka 生产者,以将 KafkaTemplate 发送给我的消费者。
我的问题是 Kafka 生产者自动装配为 null,因此测试会抛出 NullPointerException。我觉得应该是Spring的配置问题,但是找不到问题。你能帮助我吗?谢谢!
这是我的测试课:
@ExtendWith(SpringExtension.class)
@ContextConfiguration(classes = {KafkaConfiguration.class,CacheConfiguration.class,ClientConfiguration.class})
public class InvoicingTest {
@ClassRule
public static final Containers containers = Containers.Builder.aContainer()
.withKafka()
.withServer()
.build();
private final MockHttpClient mockHttpClient =
new MockHttpClient(containers.getHost(SERVER),containers.getPort(SERVER));
@Autowired
private KafkaEventProducer kafkaEventProducer;
@BeforeEach
@Transactional
void setUp() {
mockHttpClient.reset();
}
@Test
public void createElementSuccesfullResponse() throws ExecutionException,InterruptedException,TimeoutException {
mockHttpClient.whenPost("/v1/endpoint")
.respond(HttpStatusCode.OK_200);
kafkaEventProducer.produce("src/test/resources/event/invoiceCreated.json");
mockHttpClient.verify();
}
这是事件生产者:
@Component
public class KafkaEventProducer {
private final KafkaTemplate<String,String> kafkaTemplate;
private final String topic;
@Autowired
KafkaInvoicingEventProducer(KafkaTemplate<String,String> kafkaTemplate,@Value("${kafka.topic.invoicing.name}") String topic){
this.kafkaTemplate = kafkaTemplate;
this.topic = topic;
}
public void produce(String event){
kafkaTemplate.send(topic,event);
}
}
解决方法
您没有详细说明 KafkaEventProducer
是如何实现的(它是 @Component
吗?),您的测试类也没有使用 @SpringBootTest
和运行程序 @RunWith
进行注释。
查看此示例,使用 Apache KakfaProducer:
import org.apache.kafka.clients.producer.KafkaProducer;
public void sendRecord(String topic,String event) {
try (KafkaProducer<String,byte[]> producer = new KafkaProducer<>(producerProps(bootstrapServers,false))) {
send(producer,topic,event);
}
}
哪里
public void send(KafkaProducer<String,byte[]> producer,String topic,String event) {
try {
ProducerRecord<String,byte[]> record = new ProducerRecord<>(topic,event.getBytes());
producer.send(record).get();
} catch (InterruptedException | ExecutionException e) {
fail("Not expected exception: " + e.getMessage());
}
}
protected Properties producerProps(String bootstrapServer,boolean transactional) {
Properties producerProperties = new Properties();
producerProperties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,bootstrapServer);
producerProperties.put(KEY_SERIALIZER_CLASS_CONFIG,StringSerializer.class.getName());
producerProperties.put(VALUE_SERIALIZER_CLASS_CONFIG,ByteArraySerializer.class.getName());
if (transactional) {
producerProperties.put(TRANSACTIONAL_ID_CONFIG,"my-transactional-id");
}
return producerProperties;
}
和 bootstrapServers
取自 kafka 容器:
KafkaContainer kafka = new KafkaContainer();
kafka.start();
bootstrapServers = kafka.getBootstrapServers();