module-info.java missing "exports"

[triathematician]

Attempting to use com.fasterxml.jackson.kotlin fails because "Symbol is declared in module 'com.fasterxml.jackson.kotlin' which does not export package 'com.fasterxml.jackson.module.kotlin'"

I believe module-info should have an exports line added:

module com.fasterxml.jackson.kotlin {
    requires java.desktop;
    requires kotlin.stdlib;
    requires com.fasterxml.jackson.annotation;
    requires com.fasterxml.jackson.databind;

    exports com.fasterxml.jackson.module.kotlin;

    provides com.fasterxml.jackson.databind.Module with com.fasterxml.jackson.module.kotlin.KotlinModule;
}

[cowtowncoder]

@triathematician Is this with version 2.12.1?

And yes, I think that would be needed indeed.

[triathematician]

yes, version 2.12.1

[cowtowncoder]

Fixed as suggested, will be in 2.12.2.

Also pushed snapshot for 2.12.2-SNAPSHOT to Sonatype OSS repo if anyone could test (that or just build from 2.12 branch).

[csotiriou]

I had the same problem, and although 2.12.0-SNAPSHOT fixes the error inside the module-info.java, my application still cannot see the Kotlin-specific converters like objectMapper.convertValue(...). It only sees the Java ones, not the Kotlin extension. Note: I built from source.

[cowtowncoder]

@csotiriou I had a typo -- fix will be in 2.12.2, not 2.12.0 that was released earlier.

But I am not sure ObjectMapper.convertValue() would be related to module info, since that should only affect visibility (and class loading) of types?

[csotiriou]

Well, I had a typo myself. :) I was actually building 1.12.2-SNAPSHOT.

I switched to using com.fasterxml.jackson.module.kotlin.jacksonObjectMapper and it's fine. I am stuck at other issues for the time being - I will post back here if I have any other problems, thanks.

[cowtowncoder]

:) ok makes sense!

[csotiriou]

@cowtowncoder I believe I found an error (just started using Java 9 modules, so please bear with me). I believe an additional line should be added: requires kotlin.reflect; to the module-info.

I have a JavaFX application, and I received the following error while using this library with Retrofit

Exception in thread "OkHttp Dispatcher" java.lang.IllegalAccessError: class com.fasterxml.jackson.module.kotlin.KotlinNamesAnnotationIntrospector (in module com.fasterxml.jackson.kotlin) cannot access class kotlin.reflect.jvm.internal.KotlinReflectionInternalError (in module kotlin.reflect) because module com.fasterxml.jackson.kotlin does not read module kotlin.reflect

Adding requires kotlin.reflect in the module-info.jave file solved the problem for me.

[GedMarc]

that is possible

[cowtowncoder]

@csotiriou Thank you: I added that requires directive; please lmk if there are remaining issues.