spring-boot unit testing get application properties

Question

I'm new to spring-boot, currently trying to develop a kafka producer I want to test method that use value define in properties file. but it show value is null how solve this.I have added my property files to separate resource file in test folder also this is my folder structure

@SpringBootTest
public class KafkaProducerImplTest {
    @BeforeEach
    void setUp() {
    }

    @Test
    void check() {
        KafkaProducerImpl kpi = new KafkaProducerImpl();
        kpi.check();
    }
    }

    
    @Service
    public class KafkaProducerImpl implements KafkaProducerInterface
    {
    @Value("${kafka.brokers.local}")
    private String kafkaBrokers;
    @Value("${schema-registry}")
    private String schemaRegistry;

    private Properties config()
    {
        Properties props = new Properties();
        props.setProperty("bootstrap.servers",kafkaBrokers);
        props.setProperty("acks", "1");
        props.setProperty("reties", "10");
        props.setProperty("key.serializer", StringSerializer.class.getName());                
        props.setProperty("value.serializer",Serializer.class.getName());
        props.setProperty("schema.registry.url",schemaRegistry);
        return props;
    }

    public <K,T>KafkaProducer<K,T> getProducer()
    {
        return new KafkaProducer<>(config());
    }

    public <T>ProducerRecord createRecord(String Topic,T msg)
    {
        return new ProducerRecord<>(
                Topic,msg
        );
    }


    public void sendMessage(KafkaProducer producer,ProducerRecord record)
    {
        producer.send(record, (recordMetadata, e) -> {
            if (e == null){
                System.out.println("success");
            }
        });

        producer.flush();
    }
    public void closeProducer(KafkaProducer producer){
        producer.close();
    }
    public void check(){
        System.out.println(schemaRegistry);
    }
}

You are creating a new instance yourself instead of getting the Spring managed KafkaProducerImpl instance. — M. Deinum
– M. Deinum, Commented Aug 17, 2018 at 10:10
ok how can i take spring managed instance.because when i try get instance through @Autowired it gives error — Damitha Dayananda
– Damitha Dayananda, Commented Aug 17, 2018 at 10:23
You should autowired the KafkaProducerInterface instead of the Impl and your test needs @RunWith(SpringRunner.class). — M. Deinum
– M. Deinum, Commented Aug 17, 2018 at 17:17

Damitha Dayananda · Accepted Answer · 2018-08-19 13:19:42Z

1

finally i find way, thanks everyone helping me.

@RunWith(SpringRunner.class)
@SpringBootTest
public class KafkaProducerImplTest {
@Autowired
private KafkaProducerInterface kpi;

@Test
public void check() {
 kpi.check();       
}

}

answered Aug 19, 2018 at 13:19

Damitha Dayananda

5037 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Aditya Narayan Dixit Over a year ago

Not different from the answer I posted. :)

Aditya Narayan Dixit · Accepted Answer · 2018-08-17 18:28:49Z

0

Annotate you test class with @RunWith(SpringRunner.class) which will load application context for you and instantiate the spring beans. To add spring boot support add @SpringBootTest(Which you already have).

You'll have to remove this line

"KafkaProducerImpl kpi = new KafkaProducerImpl();"

and autowire using interface reference instead. Something like this:

@Autowired
KafkaProducerInterface kpi;

I'm assuming you have the properties used here(ex. "kafka.brokers.local") defined in your test properties file.

answered Aug 17, 2018 at 18:28

Aditya Narayan Dixit

2,12915 silver badges25 bronze badges

1 Comment

Damitha Dayananda Over a year ago

i have change my code as you said now i get, java.lang.NullPointerException

Collectives™ on Stack Overflow

spring-boot unit testing get application properties

2 Answers 2

1 Comment

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related