Jackson 2.9.5, 2.9.6 incompatible with snakeyaml 1.20, 1.21

[yborovikov]

A backwards-incompatible (with jackson 2.9.5) change was introduced in snakeyaml 1.20, so anyone trying to use the latest released versions of jackson and snakeyaml would run into a problem:

java.lang.NoSuchMethodError: org.yaml.snakeyaml.events.MappingStartEvent.<init>(Ljava/lang/String;Ljava/lang/String;ZLorg/yaml/snakeyaml/error/Mark;Lorg/yaml/snakeyaml/error/Mark;Ljava/lang/Boolean;)V

    at com.fasterxml.jackson.dataformat.yaml.YAMLGenerator.writeStartObject(YAMLGenerator.java:489)
    at com.fasterxml.jackson.core.base.GeneratorBase.writeStartObject(GeneratorBase.java:286)
    at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:626)
    at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:33)
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480)
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319)
    at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3893)
    at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:3207)

[Dico200]

Running into the same issue.

Specifically, just using jackson-dataformat-yaml isn't working. I am shadowing the snakeyaml dependency because the classpath has another incompatible version, but still running into issues.

[cowtowncoder]

@Dico200 and you did check with 2.9.6 which has been out for while now?

[cthiebaud]

@cowtowncoder the issue is still open with 2.9.6

[Dico200]

Yes, 2.9.6

[Dico200]

I resolved my problem. I found more transitive dependencies for snakeyaml that were overriding the version. But snakeyaml making this unnecessary breaking change isn't appreciated, for sure. I didn't see any warnings for it, and the version bump is similar to any other.

This isn't responsibility of Jackson, though.

[ahgittin]

I have opened https://bitbucket.org/asomov/snakeyaml/issues/412/restore-the-boolean-constructors-for to try to facilitate this. I've seen this error in other projects too. No fun!

[ahgittin]

Once snakeyaml 1.22 is out this problem should go away so long as versions 1.20/1.21 are avoided.

[Sufod]

Same issue here :(

[cthiebaud]

I confirm the issue is fixed with snakeyaml 1.23

[yborovikov]

Awesome, I'll close #82 now, and this one once snakeyaml 1.23 is released.

[soberich]

@yborovikov Man, thanks a lot, I was have to repackage jackson-dataformats for that purpose only
and raised a relevant issue swagger-api/swagger-core#2925
thank you for that PR

[cthiebaud]

FYI, snakeyaml 1.23 is released since 2018-08-27, cf.

https://search.maven.org/artifact/org.yaml/snakeyaml

or

https://repo1.maven.org/maven2/org/yaml/snakeyaml/1.23/