Spring Cloud Dataflow Type conversion not working in processor component?

Question

I have a processor which transforms byte[] payloads into MyClass payloads:

@Slf4j
@EnableBinding(Processor.class)
public class MyDecode         


        

Answer 1

You are seeing 3 attempts because that's the default retry configuration for the input channel in the binder.

There's a bug in the binder in that if the converter can't convert the message, it tries to create a message with a null payload.

The reason it can't convert the payload is because it sees the inbound content-type (presumably application/octet-stream) and it can't convert from that to JSON.

The work around is to add a file to the classpath:

META-INF/spring.integration.properties

and add

spring.integration.readOnly.headers=contentType

to it.

That prevents the propagation of the inbound content type header to the outbound message.

This requires spring integration 4.3.2 or higher.

In a future release of SCSt, this will be set by default.