OpenAPITools / OpenAPITools/openapi-generator

[BUG] [JAVA] [NATIVE] Generated client converts complex object query parameter as toString instead of json

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Issue: Bug
Dominant language
Java
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Description

Description

Generated client converts complex object query parameter as toString instead of json based on following openapi.json

openapi-generator version

6.4.0 - not regression

OpenAPI declaration file content or url

"paths" : {
"/my/test/server" : {
"get" : {
"tags" : [ "xxx" ],
"operationId" : "getXXX",
"parameters" : [ {
"name" : "complex-obj",
"in" : "query",
"required" : false,
"content" : {
"application/json" : {
"schema" : {
"$ref" : "#/components/schemas/ComplexObject"
},
"example" : null
}
}
} ],
"responses" : { ...

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the generated Java native client from the OpenAPI declaration in the issue, then trace query-parameter serialization for the complex-obj parameter. Done means the complex object is encoded as JSON rather than converted with toString().

Written by the indexing model from the issue text.

Assessment

Tech stack
java, openapi
Domain
api, tooling
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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