Jackson-databind reflection problem with swagger-ui

[mebigfatguy]

Using swagger-ui version 2.2.26 and jackson-databind version 2.18.1, on jdk21, i get tons of these errors..

ERROR io.swagger.v3.core.jackson.ModelResolver - Neither 'findJsonValueMethod' nor 'findJsonValueAccessor' found in jackson BeanDescription. Please verify your Jackson version.

When i look in jackson-databind, findJsonValueMethod has indeed been recently removed but i do see

/**
 * Method for locating accessor (readable field, or "getter" method)
 * that has
 * {@link com.fasterxml.jackson.annotation.JsonValue} annotation,
 * if any. If multiple ones are found,
 * an error is reported by throwing {@link IllegalArgumentException}
 *
 * @since 2.9
 */
public abstract AnnotatedMember findJsonValueAccessor();

So i was wondering if anyone could tell me what i am doing wrong here??
(it would also be nice to log beanDesc.getClass().getClassName() in that error message.)

[funfried]

I have the same issue, it seems it's related to having webflux and webmvc libraries inside the classpath (which is not good and I have to fix that in my case sometime), but what's strange is that the error message disappears when downgrading back to swagger 2.2.25 still having webflux and webmvc in my classpath.

[ftreede]

This is definetely a bug in swagger. Jackson removed the deprecated findJsonValueMethod method with 2.18: FasterXML/jackson-databind#4525

https://github.com/swagger-api/swagger-core/blob/df88c8a8ebaae1cb8ec39d1af295d07620dcaf87/modules/swagger-core/src/main/java/io/swagger/v3/core/jackson/ModelResolver.java#L1157-L1179

This code first tries the new method, finds it and invokes it. However, if that method returns null, the return is not called and it then tries the old method.

[ftreede]

This is actually an issue in swagger, core: check over there: swagger-api/swagger-core#4755