Binary data is not generated

Description

We have something like that in our swagger json file:

definitions {
    ...
    "BinaryData": {
            "format": "binary",
            "type": "string"
        }
    ...
}

...
"/test": {
    "get": {
        "responses": {
            "200": {
                "schema": {
                    "$ref": "#/definitions/BinaryData"
                }
            }
        }
    }
}

The generated Java class is the following:

public class BinaryData {

  @Override
  public boolean equals(java.lang.Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    return true;
  }

  @Override
  public int hashCode() {
    return Objects.hash();
  }


  @Override
  public String toString() {
    StringBuilder sb = new StringBuilder();
    sb.append("class BinaryData {\n");
    
    sb.append("}");
    return sb.toString();
  }

  /**
   * Convert the given object to string with each line indented by 4 spaces
   * (except the first line).
   */
  private String toIndentedString(java.lang.Object o) {
    if (o == null) {
      return "null";
    }
    return o.toString().replace("\n", "\n    ");
  }
  
}

As you can see, the content is missing.

Swagger-codegen version

2.2.2

Steps to reproduce

• Create swagger file like the examples above
• Generate java client

Related issues

See https://github.com/swagger-api/swagger-codegen/issues/5083

Start by reproducing the supplied swagger JSON with swagger-codegen 2.2.2 and inspect how the BinaryData schema is represented during Java client generation. Compare the generated class with the schema's string/binary content, and use related issue 5083 for context. Done means the generated Java model preserves the binary data instead of producing an empty class.