Using Panache with embedded documents: Can't find codec (JVM mode)

[Jonathan Roques]

Hey,

I've encountered an issue using panache. I have a lib (commons.jar) which contains a class names Workflow. This class has an attribute called 'steps' which a list of step.

@MongoEntity(collection = "Workflow")
@RegisterForReflection
@JsonInclude(JsonInclude.Include.NON_NULL)

public class Workflow {

      public List<Step> steps = new LinkedList<>();

}

// No annotations here but I tried with @RegisterForReflection also

public class Step {
  public int durationDays;
  public String name;
  public ObjectId id = new ObjectId();

  public Step() {}

}

This lib is used in another quarkus project.

But as soon as I wan't to read/write a Workflow I have this error :

org.bson.codecs.configuration.CodecConfigurationException: Can't find a codec for class com.clozzle.commons.model.workflows.Step.

...

I know I could just use a stepId and have a separate collection, but I wan't to understand the issue here.

Thanks for you help :)

[Loïc MATHIEU]

Hi,

Better use stackoverflow for this type of questions and provides the stacktrace.
But I guess the issue is that your common jar is not indexed by Jandex.

Quarkus uses Jandex to discover at build time the classes of your application, when using a separate jar for some classes, some extensions (and MongoDB with Panache is one of them), will need a Jandex index to be created for this external jar.

You can read this section for how to create a Jandex index for an external jar: https://quarkus.io/guides/cdi-reference#how-to-generate-a-jandex-index

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[Jonathan Roques]

Hi,

Sorry for posting here and thanks for your reply. 

I know jandex, and I have a very strange behaviour. Everything works well when I : 

1. gradle clean my project

2. quarkusBuild my project

3. quarkusDev my project 

But then, when I stop quarkusDev (via IntelliJ) and restart it I always have the Codec error. It's like some file is deleted when the app is run the first time with quarkusDev ... Am I missing something ?

[Loïc MATHIEU]

Strange, definitely need a reproducer.
If you can reproduce it, open an issue.

To view this discussion on the web visit https://groups.google.com/d/msgid/quarkus-dev/58ab5fee-6396-46af-9298-85c2dd756597n%40googlegroups.com.

[Jonathan Roques]

It's ok, I think I'll switch back to Spring boot. I lost a few weeks on multiple issues (some with aws libs, some with quarkus), and I can't afford more.

I'll try to make a post on this dev list explaining why I switched back, so that you can identify how users struggle with Quarkus. So that my experience could be useful to someone. 

Thanks again