jackson-databind: "Conflicting setter definitions for property" exception for `Map` subtype during deserialization

I’ve been deserializing Spring’s HttpHeaders without issue until I upgraded to latests Spring 2.3.0 which upgraded Jackson from 2.10.3 to 2.11.

After the upgrade to Jackson 2.11 I get this exception when trying to deserialize an HttpHeaders object:

com.fasterxml.jackson.databind.JsonMappingException: Conflicting setter definitions for property "date": org.springframework.http.HttpHeaders#setDate(1 params) vs org.springframework.http.HttpHeaders#setDate(1 params)

(same can happen for lastModified or any other overloaded setter)

There are 3 setDate methods on HttpHeaders.

It’s throw as part of POJOPropertyBuilder#getSetter()

I’ve traced it back to this change in POJOPropertiesCollector as part of #2555

I couldn’t find any way to disable indexing. #2555 is hinting that there isn’t one:

It may become necessary to allow NOT doing this, too (via MapperFeature), but let’s start by assumption that index should be used.

I’m wondering if the indexing change broke backward compatibility.

Version exhibiting behavior: 2.11 Last working version (that I tried): 2.10.4

About this issue

Original URL
State: closed
Created 4 years ago
Reactions: 3
Comments: 17 (12 by maintainers)

Commits related to this issue

Fixed #2757 — committed to FasterXML/jackson-databind by cowtowncoder 4 years ago

Most upvoted comments

This bug is back on v2.12.6:

java.lang.IllegalArgumentException: Conflicting setter definitions for property "expires": org.springframework.http.HttpHeaders#setExpires(java.time.ZonedDateTime) vs org.springframework.http.HttpHeaders#setExpires(java.time.Instant)
	at com.fasterxml.jackson.databind.introspect.POJOPropertyBuilder.getSetter(POJOPropertyBuilder.java:512) ~[jackson-databind-2.12.6.jar:2.12.6]
	at io.swagger.v3.core.jackson.ModelResolver.ignore(ModelResolver.java:1006) ~[swagger-core-2.1.12.jar:2.1.12]
	at io.swagger.v3.core.jackson.ModelResolver.resolve(ModelResolver.java:575) ~[swagger-core-2.1.12.jar:2.1.12]
	at org.springdoc.core.converters.AdditionalModelsConverter.resolve(AdditionalModelsConverter.java:123) ~[springdoc-openapi-common-1.6.6.jar:1.6.6]

bratwurzt on Mar 18, 2022