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[BUG][openapi-generator-maven-plugin] importmapping not respected since 5.4.0

See original GitHub issue

Bug Report Checklist

Have you provided a full/minimal spec to reproduce the issue? Yes, inside attached ZIP
Have you validated the input using an OpenAPI validator (example)?
Have you tested with the latest master to confirm the issue still exists? -> No, but tested with 5.4.0
Have you searched for related issues/PRs?
What’s the actual output vs expected output? Expected: StreamingResponseBody, Actual: Stream
[Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

The “importMappings” seem to have no effect with version 5.4.0. With version 5.3.1 the below configuration resulted in a “StreamingResponseBody” in the generated class. With version 5.4.0 a “Stream” class is imported but that one does not exist.

openapi-generator version

Issue occurs with openapi-generator-maven-plugin 5.4.0 and did not occur with the previous version 5.3.1.

OpenAPI declaration file content or url

If you post the code inline, please wrap it with

openapi: 3.0.3
info:
  title: Demo app
  version: 1.0.0
servers:
  - url: /api/v1
paths:
  /demo:
    get:
      summary: Demo
      operationId: demo
      responses:
        '200':
          description: Demo response
          content:
            text/csv:
              schema:
                type: string
                format: binary

Generation Details

Plugin configuration:

      <plugin>
        <groupId>org.openapitools</groupId>
        <artifactId>openapi-generator-maven-plugin</artifactId>
        <!-- With version 5.3.1 of the plugin, the generated "DemoApi.java" contains default org.springframework.web.servlet.mvc.method.annotation.StreamingResponseBody as expected -->
        <!-- With version 5.4.0 of the plugin, the generated "DemoApi.java" contains "Stream", but the org.example.bug.demo.api.Stream is not created -->
        <version>5.4.0</version>
        <executions>
          <execution>
            <id>bug-demo</id>
            <goals>
              <goal>generate</goal>
            </goals>
            <configuration>
              <inputSpec>${project.basedir}/src/main/resources/spec.yaml</inputSpec>
              <generatorName>spring</generatorName>
              <apiPackage>org.example.bug.demo.api</apiPackage>
              <modelPackage>org.example.bug.demo.api</modelPackage>
              <configOptions>
                <delegatePattern>true</delegatePattern>
              </configOptions>
              <importMappings>
                stream=org.springframework.web.servlet.mvc.method.annotation.StreamingResponseBody
              </importMappings>
              <typeMappings>string+binary=stream</typeMappings>
            </configuration>
          </execution>
        </executions>
      </plugin>