Typing request objects in JAXRS api definition

Description

Hi, we are using the "swagger-codegen-maven-plugin" in version 3.0.0-SNAPSHOT and we noticed that when the plugin create API definitions class doesn't typing correctly the request object.

Swagger-codegen version

3.0.0-SNAPSHOT

Command line used for generation

mvn clean install

following the configuration of the maven plugin

<plugin>
	<groupId>io.swagger</groupId>
	<artifactId>swagger-codegen-maven-plugin</artifactId>
	<version>3.0.0-SNAPSHOT</version>
	<executions>
		<execution>
			<goals>
				<goal>generate</goal>
			</goals>
			<configuration>
				<inputSpec>src/main/resources/test.json</inputSpec>
				<language>jaxrs-cxf-client</language>
				<withXml>true</withXml>
				<sourceFolder>src/main/java</sourceFolder>
				<apiPackage>codegen.api</apiPackage>
				<modelPackage>codegen.model</modelPackage>
				<generateApis>true</generateApis>
				<generateApiTest>false</generateApiTest>
				<generateApiDocumentation>false</generateApiDocumentation>
				<generateModels>true</generateModels>
				<generateModelTests>false</generateModelTests>
				<generateModelDocumentation>false</generateModelDocumentation>
				<dateLibrary>java8-localdatetime</dateLibrary>
			</configuration>
		</execution>
	</executions>
</plugin>

Swagger declaration file content or url

following the configuration of the example json

{
    "swagger": "2.0",
    "info": {
        "description": "description",
        "version": "1.0",
        "title": "Test json"
    },
    "host": "localhost:8080",
    "basePath": "/tets/servlet/services",
    "schemes": [
        "http"
    ],
    "paths": {
        "/testRequest": {
            "post": {
                "operationId": "testRequest",
                "tags": [
                    "test operation"
                ],
                "description": "",
                "consumes": [
                    "application/json"
                ],
                "produces": [
                    "application/json",
                    "text/plain"
                ],
                "parameters": [
                    {
                        "in": "body",
                        "name": "Request Body",
                        "required": true,
                        "schema": {
                            "$ref": "#/definitions/TestRequest"
                        }
                    }
                ],
                "responses": {
                    "200": {
                        "description": "OK",
                        "schema": {
                            "$ref": "#/definitions/TestResponse"
                        }
                    }
                }
            }
        }
    },
    "definitions": {
        "TestRequest": {
            "description": "Request Message",
            "type": "object",
            "allOf": [ {
                    "properties": {
                        "body": {
                            "$ref": "#/definitions/TestRequestBody"
                        }
                    },
                    "required": [
                        "body"
                    ]
                }
            ]
        },
        "TestRequestBody": {
            "type": "object",
            "properties": {
                "TestCode": {
                    "$ref": "#/definitions/tTestCode"
                }
            },
            "required": [
                "TestCode"
            ]
        },
        "TestResponse": {
            "description": "Response Message",
            "type": "object",
            "allOf": [ {
                    "properties": {
                        "body": {
                            "$ref": "#/definitions/TestResponseBody"
                        }
                    },
                    "required": [
                        "body"
                    ]
                }
            ]
        },
        "TestResponseBody": {
            "type": "object",
            "properties": {
                "TestType": {
                    "$ref": "#/definitions/tTestType"
                }
            },
            "required": [
                "TestType"
            ]
        },
        "tTestCode": {
            "type": "integer",
            "minLength": 3,
            "maxLength": 3,
            "format": "int64"
        },
        "tTestType": {
            "type": "string",
            "minLength": 0,
            "maxLength": 20,
            "enum": [
                "Test1",
                "Test2",
                "Test3"
            ]
        }
    }
}

The resulting code, in detail, is:

@Path("/")
@Api(value = "/", description = "")
public interface TestOperationApi  {
    @POST
    @Path("/testRequest")
    @Consumes({ "application/json" })
    @Produces({ "application/json", "text/plain" })
    @ApiOperation(value = "", tags={  })
    @ApiResponses(value = { 
        @ApiResponse(code = 200, message = "OK", response = TestResponse.class) })
    public TestResponse testRequest(Object body);
}

instead of:

@Path("/")
@Api(value = "/", description = "")
public interface TestOperationApi  {
    @POST
    @Path("/testRequest")
    @Consumes({ "application/json" })
    @Produces({ "application/json", "text/plain" })
    @ApiOperation(value = "", tags={  })
    @ApiResponses(value = { 
        @ApiResponse(code = 200, message = "OK", response = TestResponse.class) })
    public TestResponse testRequest(TestRequest body);
}

In detail, we need to have a parameter input with TestRequest class intead a generic Object class.

Thank you.

Reproduce the generation with the swagger-codegen-maven-plugin configuration, using src/main/resources/test.json and the jaxrs-cxf-client language. Inspect the generated TestOperationApi signature and trace how the body parameter type is selected. Done means the generated method accepts TestRequest instead of Object, while preserving the shown response and annotations.