Guice Configuration Error No implementation was bound

tanvi :

I am trying to keep a singleton AmazonSNS to access an SNS. I have written a module for SNS (only one SNS is added currently) and an accessor to publish the message. My code is as follows:

public class SNSModule extends AbstractModule {

    @Override
    protected void configure() {
    }

    @Provides
    @Named("PSSNSRegionName")
    private Regions getPSSNSRegionName(
            @Named(BeanConstants.P_S_SNS_REGION) final String regionName) {
        return Regions.fromName(regionName);
    }

    @Provides
    @Singleton
    @Named(BeanConstants.P_S_SNS)
    public AmazonSNS getPSSNS(
            @NonNull @Named("PaymentSuccessSNSRegionName") final Regions region,
            final Config config) {
        return AmazonSNSClientBuilder.standard()
                .withCredentials(new AWSCredentialsProviderImpl(config.getSnsMaterialSet()))
                .withRegion(region)
                .build();
    }

}

The SNS Accessor is as follows:

@RequiredArgsConstructor(access = AccessLevel.PUBLIC, onConstructor = @__(@Inject))
public class SNSAccessor {

    @Named(BeanConstants.P_S_SNS)
    private final AmazonSNS snsClient;
    private static final String COLON = ":";
    private static final short ARN_LENGTH = 6;

    public PublishResult publishToSNS(@NonNull final String snsTopicArn, @NonNull final String messageToPublish) {
        try {
            String[] arnParts = snsTopicArn.split(COLON);
            Preconditions.checkArgument(
                    snsTopicArn.split(COLON).length == ARN_LENGTH,
                    "Expected arn to have 6 parts but found: " + arnParts.length
            );
            return snsClient.publish(snsTopicArn, messageToPublish);
        } catch (InternalErrorException e) {
            log.error("InternalErrorException publishing notification to SNS", e);
            throw new RetriableException(e);
        } catch (Exception e) {
            log.error("Exception publishing notification to SNS", e);
            throw new NonRetriableException(e);
        }
    }
}

I was able to build the package but it threw ConfigurationException at runtime.

Caused by: com.google.inject.ConfigurationException: Guice configuration errors:

1) No implementation for com.amazonaws.services.sns.AmazonSNS was bound.
  while locating com.amazonaws.services.sns.AmazonSNS
    for parameter 0 at com.xyz.service.sns.SNSAccessor.<init>(SNSAccessor.java:29)

Could you please help me figure out what I am doing wrong? I have installed the SNSModule in main correctly.

Deepak gupta :

Lombok's @RequiredArgsConstructor with onConstructor option does not work with the annotated dependency injections. You need to write a constructor explicitly for this case.

Guice Configuration Error No implementation was bound

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