Kafka Streams topology in Dev UI is empty when source topic uses `Pattern`

[nscuro]

Describe the bug

The Dev UI for Kafka Streams shows no / an empty topology when the source topic uses a Pattern instead of static names.

package org.acme.consumer;

import org.apache.kafka.common.serialization.Serdes;
import org.apache.kafka.streams.StreamsBuilder;
import org.apache.kafka.streams.Topology;
import org.apache.kafka.streams.kstream.Consumed;
import org.apache.kafka.streams.kstream.KStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Produces;
import java.util.regex.Pattern;

@ApplicationScoped
class NotificationTopologyBuilder {

    private static final Logger LOGGER = LoggerFactory.getLogger(NotificationTopologyBuilder.class);

    @Produces
    public Topology topology() {
        final var streamsBuilder = new StreamsBuilder();
        streamsBuilder
                .stream(Pattern.compile("notification\\..+"),
                        Consumed.with(Serdes.String(), Serdes.String()))
                .foreach((key, notification) -> LOGGER.info(notification));

        final Topology topology = streamsBuilder.build();
        LOGGER.info("Topology: {}", topology.describe());
        return topology;
    }

}

Upon startup, this logs:

Topology: Topologies:
   Sub-topology: 0
    Source: KSTREAM-SOURCE-0000000000 (topics: notification\..+)
      --> KSTREAM-FOREACH-0000000001
    Processor: KSTREAM-FOREACH-0000000001 (stores: [])
      --> none
      <-- KSTREAM-SOURCE-0000000000

Expected behavior

The Dev UI should show display the topology, even when the input topic uses a pattern.

Actual behavior

The Dev UI does not pick up the topology. It is neither available in image, nor in text format.

Changing the source topic to a static name causes the topology to be picked up correctly:

The log output in this case is:

Topology: Topologies:
   Sub-topology: 0
    Source: KSTREAM-SOURCE-0000000000 (topics: [notification.repository])
      --> KSTREAM-FOREACH-0000000001
    Processor: KSTREAM-FOREACH-0000000001 (stores: [])
      --> none
      <-- KSTREAM-SOURCE-0000000000

How to Reproduce?

1. Setup a Quarkus project with kafka-streams extension
2. Add the topology as described above
3. Run the Quarkus app in dev mode
4. In the Dev UI, navigate to the Kafka Streams Topology section

Output of uname -a or ver

Linux ctrl 5.15.0-53-generic #59-Ubuntu SMP Mon Oct 17 18:53:30 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

Output of java -version

openjdk version "17.0.4.1" 2022-08-12 OpenJDK Runtime Environment Temurin-17.0.4.1+1 (build 17.0.4.1+1) OpenJDK 64-Bit Server VM Temurin-17.0.4.1+1 (build 17.0.4.1+1, mixed mode, sharing)

GraalVM version (if different from Java)

No response

Quarkus version or git rev

2.14.1.Final

Build tool (ie. output of mvnw --version or gradlew --version)

Apache Maven 3.8.6 (84538c9988a25aec085021c365c560670ad80f63)

Additional information

No response

[quarkus-bot[bot]]

/cc @alesj, @cescoffier, @gunnarmorling, @ozangunalp, @rquinio

[gsmet]

@tmihalac this one might be a good fit for you.