Providing ObjectMapper inside recorder class or inside a processor class

[IvanPuntev]

Is there a way to provide jackson ObjectMapper inside @Recorder class or inside a processor class with a build step?

[cescoffier]

\CC @geoand

[geoand]

The answer is yes, but it depends :)

What exactly are you trying to achieve?

[IvanPuntev]

Hi @geoand. In the quarkus-logging-json extension we have an instance of the object mapper but we need a way to provide a mapper from outside (for example: the already configured / customized one that you use in your component) https://github.com/quarkiverse/quarkus-logging-json/blob/main/runtime/src/main/java/io/quarkiverse/loggingjson/jackson/JacksonJsonFactory.java#L24 . Currently this factory is instantiated during the build time but we somehow need to provide a mapper from outside https://github.com/quarkiverse/quarkus-logging-json/blob/main/deployment/src/main/java/io/quarkiverse/loggingjson/deployment/LoggingJsonProcessor.java#L53 . I've already proposed a solution quarkiverse/quarkus-logging-json#375 but also looking for other possible ways to do this.

[geoand]

You can pull the ObjectMapper from Arc, but in the case of the logging extension because it is needed so early, you'll have to check and see if it works properly

[IvanPuntev]

@geoand I've used Arc to get instance - ObjectMapper objectMapper = Arc.container().instance(ObjectMapper.class).get();
but the returned mapper is null. Probably need to make the processor depend on a jackson build item or something like that so I'm sure the mapper will be initialized before using it in the build step? What would be the best approach to ensure the object mapper is initialized before i use it?

[IvanPuntev]

@geoand I think if i create my own cdi bean that injects the mapper and make it unremovable and later use Arc to get the instance of my bean it should work.

[IvanPuntev]

quarkiverse/quarkus-logging-json#395

[geoand]

Seems reasonable