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Application fails to start with Spring Cloud Stream + multiple output bindings for function

See original GitHub issue

A Spring Cloud Stream function with multiple output bindings uses following signature: Function<Flux<Integer>, Tuple2<Flux<String>, Flux<String>>>.

When Sleuth is on the classpath & enabled, the TraceFunctionAroundWrapper throws a ClassCastException because it tries to cast the Tuple2 result to Flux, more specifically on this line.

Release train: 2021.0.0 Sleuth 3.1.0

Sample See https://github.com/TYsewyn/sleuth-multiple-output-streams-fails

Issue Analytics

State:
Created 2 years ago
Comments:10 (10 by maintainers)

Top GitHub Comments

1reaction

TYsewyncommented, Dec 14, 2021

The problem is with this line of code in TraceFunctionAroundWrapper: final Flux<Message> function = ((Flux<Message>) targetFunction.apply(flux));

So instead of immediately casting the result of targetFunction.apply(flux)) to Flux<Message> we could check the instance type of the result: Flux, Tuple or Iterable (Tuple2…8 are implementing this interface). In case it is a Tuple we could get all Flux from the tuple as an array, wrap each of them, and return a new Tuple based on the size of the array.

1reaction

marcingrzejszczakcommented, Dec 14, 2021

Can you check the latest snapshots?

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