[JAVA] Generated models have incorrect type for referenced primitive property

Description

I would like to cross-reference a primitive property from #/components/schemas/ObjectA/properties/property into object B and then have the model for object B declare the property type as the correct primitive type.

Currently, such a cross-reference validates but results in a generated model where the type is the non-existing 'ObjectApropertiesproperty' (note that this is equivalent to the last three elements of the path without the / character), resulting in unusable code.

Swagger-codegen version

3.0.16. Also observed in earlier versions.

Swagger declaration file content or url

Example:

openapi: 3.0.1
info:
  title: Swagger Petstore
  description: Cross-reference properties in java autogen code bug test
  version: 1.0.0
paths:
  /pet/:
    get:
      responses:
        200:
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Pet'
  /pet-summary/:
    get:
      responses:
        200:
          description: successful operation
          content:
            '*/*':
              schema:
                $ref: '#/components/schemas/Pet-Summary'
components:
  schemas:
    Pet:
      type: object
      properties:
        name:
          type: string
          example: doggie
    Pet-Summary:
      type: object
      properties:
        name:
          $ref: '#/components/schemas/Pet/properties/name'

Results in the following autogenerated model 'PetSummary'

@javax.annotation.Generated(value = "io.swagger.codegen.v3.generators.java.JavaClientCodegen", date = "2020-02-05T15:26:50.087-05:00[America/New_York]")
public class PetSummary {
  @JsonProperty("id")
  private Integer id = null;

  @JsonProperty("name")
  private Petpropertiesname name = null;
  // ...

Whereas the expected model would be:

@javax.annotation.Generated(value = "io.swagger.codegen.v3.generators.java.JavaClientCodegen", date = "2020-02-05T15:26:50.087-05:00[America/New_York]")
public class PetSummary {
  @JsonProperty("id")
  private Integer id = null;

  @JsonProperty("name")
  private String name = null;
  // ...

Command line used for generation

mvn -P generate-api

where the pom has the following profile:

      <profile>
            <id>generate-api</id>
            <properties>
                <packaging>pom</packaging>
                <sfdcapi-inputspec>src/main/resources/api.yml</sfdcapi-inputspec>
            </properties>
            <build>
                <defaultGoal>clean generate-sources</defaultGoal>
                <plugins>
                    <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-clean-plugin</artifactId>
                        <configuration>
                            <excludeDefaultDirectories>true</excludeDefaultDirectories>
                            <filesets>
                                <fileset>
                                    <directory>src/main/java/com/test/api</directory>
                                </fileset>
                                <fileset>
                                    <directory>src/main/java/com/test/model</directory>
                                </fileset>
                            </filesets>
                        </configuration>
                    </plugin>

                    <plugin>
                        <groupId>io.swagger.codegen.v3</groupId>
                        <artifactId>swagger-codegen-maven-plugin</artifactId>
                        <version>3.0.16</version>
                        <executions>
                            <execution>
                                <goals>
                                    <goal>generate</goal>
                                </goals>
                                <configuration>
                                    <language>java</language>
                                    <apiPackage>com.test.api</apiPackage>
                                    <modelPackage>com.test.model</modelPackage>
                                    <generateModels>true</generateModels>
                                    <generateApis>true</generateApis>
                                    <generateModelTests>false</generateModelTests>
                                    <generateApiTests>false</generateApiTests>
                                    <generateSupportingFiles>false</generateSupportingFiles>
                                    <generateModelDocumentation>false</generateModelDocumentation>
                                    <generateApiDocumentation>false</generateApiDocumentation>
                                    <addCompileSourceRoot>false</addCompileSourceRoot>
                                    <configOptions>
                                        <dateLibrary>java8</dateLibrary>
                                        <java8>true</java8>
                                        <library>resttemplate</library>
                                    </configOptions>
                                    <inputSpec>${sfdcapi-inputspec}</inputSpec>
                                    <output>${project.basedir}</output>
                                </configuration>
                            </execution>
                        </executions>
                    </plugin>
                    
                </plugins>
            </build>
        </profile>

Steps to reproduce

1. Update POM as shown above
2. Create api.yml in src/main/resources in a project directory
3. Run mvn -P generate-api

Related issues/PRs

https://github.com/swagger-api/swagger-codegen/issues/6322

Suggest a fix/enhancement

When creating a model object that is defined in-part by referenced properties, respect the datatype of the referenced property.

Start with the api.yml example and the Maven generate-api profile, then reproduce the output for PetSummary. Trace the Java model generation and referenced-property type resolution; done means the generated name field uses String rather than Petpropertiesname and the reproduction still generates successfully.