Duplicate Message Convertors

[hassanrehman01398]

Issue Description:

I'm encountering an issue with duplicate MappingJackson Converters of the same data type in my Spring application. The first converter has five modules registered, while the second one has two. When making a RestTemplate call, the second converter is being invoked, leading to the following error:

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Invalid type definition for type Argument #0 of constructor com.fasterxml.jackson.annotation.JsonCreator=@com.fasterxml.jackson.annotation.JsonCreator(mode=DEFAULT)} has no property name (and is not Injectable): cannot use as property-based Creator

This error indicates a problem during Jackson deserialization. It appears that the second converter is causing conflicts in the deserialization process, resulting in the mentioned exception.

Steps to Reproduce:

Register two MappingJackson Converters of the same data type.
The first converter has five modules, and the second converter has two modules.
Make a RestTemplate call that triggers the deserialization process.
Expected Behavior:

The RestTemplate should use the first converter for deserialization without any issues.

Actual Behavior:

The second converter is invoked during deserialization, leading to the InvalidDefinitionException.

[wilkinsona]

Thanks for the report. Unfortunately, the steps to reproduce aren't sufficient for us to diagnose the problem as they leave too much unknown. If you would like us to spend some more time investigating, please spend some time providing a complete yet minimal sample that reproduces the problem. You can share it with us by pushing it to a separate repository on GitHub or by zipping it up and attaching it to this issue.

[wilkinsona]

We're a small team and, unfortunately, we cannot afford to spend our time recreating a problem from a brief description and a screenshot. You haven't even told us which version of Spring Boot you're using.

As I said above, if you would like us to spend some more time investigating, please spend some time providing a complete yet minimal sample that reproduces the problem. You can share it with us by pushing it to a separate repository on GitHub or by zipping it up and attaching it to this issue.

[wilkinsona]

The code is private and I can't share that

We don't need to see your full app, just a minimal app that reproduces the problem.

Spring version: 2.7.5

OSS support for Spring Boot 2.7.x is no longer available. Please upgrade to 3.1.x or later. If the problem still occurs and you provide a complete yet minimal example that reproduces it, we can re-open this issue and take another look.

[bclozel]

Also see #21374 (comment)