Spring redis unable to autowire repository

Question

I'm using custom crudrespository to persist data in redis. However, I'm unable to autowire custom repository.

All the configuration seems correct and redis is running on my local.

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface CustomRepository extends CrudRepository<String, 
Long> {

String get(String key);

void put(String key, String value);
}

//////////

public class StorageServiceImpl implements IStorageService {


    @Autowired
    private CustomRepository respository;

    @Override
    public void saveParameter() {
    this.respository.put("key1","value1");
    }

    @Override
    public String getParameter() {
    return this.respository.get("key1");
    }

/////

@Service
public interface IStorageService {

    void saveParameter();

    String getParameter();
}
///////

@SpringBootApplication(scanBasePackages = {"com.example.cache"})
@EnableRedisRepositories(basePackages = {"com.example.cache.repository"})
public class ApplicationConfiguration {

public static void main(String[] args){
    SpringApplication.run(ApplicationConfiguration.class, args);
    new StorageServiceImpl().saveParameter();
        System.out.println(new StorageServiceImpl().getParameter());
    }
}

When I try running this application using gradle bootRun, I get

Exception in thread "main" java.lang.NullPointerException at com.example.cache.impl.StorageServiceImpl.saveParameter(StorageServiceImpl.java:16) at com.example.cache.ApplicationConfiguration.main(ApplicationConfiguration.java:17)

Not sure what's wrong?

DCTID · Accepted Answer · 2019-07-21T03:40:02.090

You can't use new on any bean, you need to @Autowire it. The annotations only work with spring managed beans at every level.

Add a new bean with a a storage service and a method that makes your call after it is created.

Also, I can't remember if the spring-boot creates the bean if there is only one implementation but I believe your StorageServiceImpl needs the @Service annotation, not the interface.

Delete this from your ApplicationConfiguration class.

new StorageServiceImpl().saveParameter();
System.out.println(new StorageServiceImpl().getParameter());

Then add this new class.

@Service
public class Startup {

    @Autowired
    IStorageService storageService;

    @PostConstruct
    public void init(){

         storageService.saveParameter();
         System.out.println(storageService().getParameter());
    }
}

And you need a config

@Configuration
@EnableRedisRepositories
public class ApplicationConfig {

  @Bean
  public RedisConnectionFactory connectionFactory() {
    return new JedisConnectionFactory();
  }

  @Bean
  public RedisTemplate<?, ?> redisTemplate() {

    RedisTemplate<byte[], byte[]> template = new RedisTemplate<byte[], byte[]>();
    return template;
  }
}

I did the above change. Now I'm getting "Field respository in com.example.cache.impl.StorageServiceImpl required a bean of type 'com.example.cache.repository.CustomRepository' that could not be found." — heart_coder, Jul 21 '19 at 01:12
Did you move the `@Service` annotation to the impl class? If so do you have a Redis configuration? https://docs.spring.io/spring-data/data-redis/docs/current/reference/html/ has many different examples depending on the environment. I added a simple one to the answer — DCTID, Jul 21 '19 at 03:39

Spring redis unable to autowire repository

1 Answers1