[JAVA] [Jersey2] Erroneous conflict detection with grand-parent in generated model

Description

The conflict detection defined in JavaClientCodeGen (could also apply to other libraries) does not consider grand-parent models initially which causes inconsistent naming of class fields.

With the example provided further down, the output java files have the following two field definitions:

From the generated src/main/java/io/swagger/client/model/CallbackBody.java

  @JsonProperty("fieldDefinedOnChildAndGrandParent")
  private String fieldDefinedOnChildAndGrandParent = null;

From the generated src/main/java/io/swagger/client/model/AnotherCallbackBody.java

  @JsonProperty("fieldDefinedOnChildAndGrandParent")
  private String anotherCallbackBodyFieldDefinedOnChildAndGrandParent = null;

Swagger-codegen version

1.0.35 (swagger-codegen-generators-1.0.35-20220726.195331-5.jar)

Swagger declaration file content or url

See gist here: https://gist.github.com/cooltea713705/d4c6c1cd59447e9ebb11555b24812b15

Command line used for generation

From IDE with the 64e27b7b9734ab87b985350886f408d66f3f3fcd version of io.swagger.codegen.v3.cli.SwaggerCodegen with arguments: generate -l java --library jersey2

Steps to reproduce

1. Generate code with the command line provided above.

Related issues/PRs

N/A (could not find an issue with the mention of grandparent which matched the issue described here).

Suggest a fix/enhancement

• Conflict detection: https://github.com/swagger-api/swagger-codegen/blob/8e4adef5053d5390a3e10fb0fe77384541a85d4c/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractJavaCodegen.java#L1050-L1051
• parentModel assignment: https://github.com/swagger-api/swagger-codegen-generators/blob/64abd533b25358e403afd544121d5115ed8f822b/src/main/java/io/swagger/codegen/v3/generators/DefaultCodegenConfig.java#L290

Could it be that the issue is that the parentModel assignment should loop up the class hierarchy?

Read the conflict-detection code in modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractJavaCodegen.java and the parentModel assignment in swagger-codegen-generators/src/main/java/io/swagger/codegen/v3/generators/DefaultCodegenConfig.java. Reproduce the issue with the linked gist using the Java Jersey2 generation command, then verify that generated CallbackBody.java and AnotherCallbackBody.java use consistent field naming across the grand-parent hierarchy.