This version is still in development and is not considered stable yet. For the latest stable version, please use Spring Integration 6.4.0!

Annotation-Based Configuration

The following example from the samples repository shows some of the configuration options available when you use annotations instead of XML:

@EnableIntegration (1)
@IntegrationComponentScan (2)
@Configuration
public static class Config {

    @Value(${some.port})
    private int port;

    @MessagingGateway(defaultRequestChannel="toTcp") (3)
    public interface Gateway {

        String viaTcp(String in);

    }

    @Bean
    @ServiceActivator(inputChannel="toTcp") (4)
    public MessageHandler tcpOutGate(AbstractClientConnectionFactory connectionFactory) {
        TcpOutboundGateway gate = new TcpOutboundGateway();
        gate.setConnectionFactory(connectionFactory);
        gate.setOutputChannelName("resultToString");
        return gate;
    }

    @Bean (5)
    public TcpInboundGateway tcpInGate(AbstractServerConnectionFactory connectionFactory)  {
        TcpInboundGateway inGate = new TcpInboundGateway();
        inGate.setConnectionFactory(connectionFactory);
        inGate.setRequestChannel(fromTcp());
        return inGate;
    }

    @Bean
    public MessageChannel fromTcp() {
        return new DirectChannel();
    }

    @MessageEndpoint
    public static class Echo { (6)

        @Transformer(inputChannel="fromTcp", outputChannel="toEcho")
        public String convert(byte[] bytes) {
            return new String(bytes);
        }

        @ServiceActivator(inputChannel="toEcho")
        public String upCase(String in) {
            return in.toUpperCase();
        }

        @Transformer(inputChannel="resultToString")
        public String convertResult(byte[] bytes) {
            return new String(bytes);
        }

    }

    @Bean
    public AbstractClientConnectionFactory clientCF() { (7)
        return new TcpNetClientConnectionFactory("localhost", this.port);
    }

    @Bean
    public AbstractServerConnectionFactory serverCF() { (8)
        return new TcpNetServerConnectionFactory(this.port);
    }

}

1	Standard Spring Integration annotation enabling the infrastructure for an integration application.
2	Searches for `@MessagingGateway` interfaces.
3	The entry point to the client-side of the flow. The calling application can use `@Autowired` for this `Gateway` bean and invoke its method.
4	Outbound endpoints consist of a `MessageHandler` and a consumer that wraps it. In this scenario, the `@ServiceActivator` configures the endpoint, according to the channel type.
5	Inbound endpoints (in the TCP/UDP module) are all message-driven and so only need to be declared as simple `@Bean` instances.
6	This class provides a number of POJO methods for use in this sample flow (a `@Transformer` and `@ServiceActivator` on the server side and a `@Transformer` on the client side).
7	The client-side connection factory.
8	The server-side connection factory.