[Java][Native] Fix multipart builder files array (#16055) (#16094)

* [Java] Fixed bug in native client generation when API accepts array of files (#16055)

* Adding test for java native client

* Updated samples

samples/client/echo_api/java/apache-httpclient/README.md

@@ -107,6 +107,7 @@ Class | Method | HTTP request | Description
 ------------ | ------------- | ------------- | -------------
 *BodyApi* | [**testBinaryGif**](docs/BodyApi.md#testBinaryGif) | **POST** /binary/gif | Test binary (gif) response body
 *BodyApi* | [**testBodyApplicationOctetstreamBinary**](docs/BodyApi.md#testBodyApplicationOctetstreamBinary) | **POST** /body/application/octetstream/binary | Test body parameter(s)
+*BodyApi* | [**testBodyMultipartFormdataArrayOfBinary**](docs/BodyApi.md#testBodyMultipartFormdataArrayOfBinary) | **POST** /body/application/octetstream/array_of_binary | Test array of binary in multipart mime
 *BodyApi* | [**testEchoBodyFreeFormObjectResponseString**](docs/BodyApi.md#testEchoBodyFreeFormObjectResponseString) | **POST** /echo/body/FreeFormObject/response_string | Test free form object
 *BodyApi* | [**testEchoBodyPet**](docs/BodyApi.md#testEchoBodyPet) | **POST** /echo/body/Pet | Test body parameter(s)
 *BodyApi* | [**testEchoBodyPetResponseString**](docs/BodyApi.md#testEchoBodyPetResponseString) | **POST** /echo/body/Pet/response_string | Test empty response body

samples/client/echo_api/java/apache-httpclient/api/openapi.yaml

@@ -427,6 +427,27 @@ paths:
       tags:
       - body
       x-accepts: image/gif
+  /body/application/octetstream/array_of_binary:
+    post:
+      description: Test array of binary in multipart mime
+      operationId: test/body/multipart/formdata/array_of_binary
+      requestBody:
+        content:
+          multipart/form-data:
+            schema:
+              $ref: '#/components/schemas/test_body_multipart_formdata_array_of_binary_request'
+      responses:
+        "200":
+          content:
+            text/plain:
+              schema:
+                type: string
+          description: Successful operation
+      summary: Test array of binary in multipart mime
+      tags:
+      - body
+      x-content-type: multipart/form-data
+      x-accepts: text/plain
 components:
   requestBodies:
     Pet:
@@ -657,4 +678,14 @@ components:
       allOf:
       - $ref: '#/components/schemas/Bird'
       - $ref: '#/components/schemas/Category'
+    test_body_multipart_formdata_array_of_binary_request:
+      properties:
+        files:
+          items:
+            format: binary
+            type: string
+          type: array
+      required:
+      - files
+      type: object
 

samples/client/echo_api/java/apache-httpclient/docs/BodyApi.md

@@ -6,6 +6,7 @@ All URIs are relative to *http://localhost:3000*
 |------------- | ------------- | -------------|
 | [**testBinaryGif**](BodyApi.md#testBinaryGif) | **POST** /binary/gif | Test binary (gif) response body |
 | [**testBodyApplicationOctetstreamBinary**](BodyApi.md#testBodyApplicationOctetstreamBinary) | **POST** /body/application/octetstream/binary | Test body parameter(s) |
+| [**testBodyMultipartFormdataArrayOfBinary**](BodyApi.md#testBodyMultipartFormdataArrayOfBinary) | **POST** /body/application/octetstream/array_of_binary | Test array of binary in multipart mime |
 | [**testEchoBodyFreeFormObjectResponseString**](BodyApi.md#testEchoBodyFreeFormObjectResponseString) | **POST** /echo/body/FreeFormObject/response_string | Test free form object |
 | [**testEchoBodyPet**](BodyApi.md#testEchoBodyPet) | **POST** /echo/body/Pet | Test body parameter(s) |
 | [**testEchoBodyPetResponseString**](BodyApi.md#testEchoBodyPetResponseString) | **POST** /echo/body/Pet/response_string | Test empty response body |
@@ -141,6 +142,72 @@ No authorization required
 | **200** | Successful operation |  -  |
 
 
+## testBodyMultipartFormdataArrayOfBinary
+
+> String testBodyMultipartFormdataArrayOfBinary(files)
+
+Test array of binary in multipart mime
+
+Test array of binary in multipart mime
+
+### Example
+
+```java
+// Import classes:
+import org.openapitools.client.ApiClient;
+import org.openapitools.client.ApiException;
+import org.openapitools.client.Configuration;
+import org.openapitools.client.models.*;
+import org.openapitools.client.api.BodyApi;
+
+public class Example {
+    public static void main(String[] args) {
+        ApiClient defaultClient = Configuration.getDefaultApiClient();
+        defaultClient.setBasePath("http://localhost:3000");
+
+        BodyApi apiInstance = new BodyApi(defaultClient);
+        List<File> files = Arrays.asList(); // List<File> | 
+        try {
+            String result = apiInstance.testBodyMultipartFormdataArrayOfBinary(files);
+            System.out.println(result);
+        } catch (ApiException e) {
+            System.err.println("Exception when calling BodyApi#testBodyMultipartFormdataArrayOfBinary");
+            System.err.println("Status code: " + e.getCode());
+            System.err.println("Reason: " + e.getResponseBody());
+            System.err.println("Response headers: " + e.getResponseHeaders());
+            e.printStackTrace();
+        }
+    }
+}
+```
+
+### Parameters
+
+
+| Name | Type | Description  | Notes |
+|------------- | ------------- | ------------- | -------------|
+| **files** | **List&lt;File&gt;**|  | |
+
+### Return type
+
+**String**
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: multipart/form-data
+- **Accept**: text/plain
+
+
+### HTTP response details
+| Status code | Description | Response headers |
+|-------------|-------------|------------------|
+| **200** | Successful operation |  -  |
+
+
 ## testEchoBodyFreeFormObjectResponseString
 
 > String testEchoBodyFreeFormObjectResponseString(body)

samples/client/echo_api/java/apache-httpclient/src/main/java/org/openapitools/client/api/BodyApi.java

@@ -189,6 +189,82 @@ public class BodyApi {
     );
   }
 
+  /**
+   * Test array of binary in multipart mime
+   * Test array of binary in multipart mime
+   * @param files  (required)
+   * @return String
+   * @throws ApiException if fails to make API call
+   */
+  public String testBodyMultipartFormdataArrayOfBinary(List<File> files) throws ApiException {
+    return this.testBodyMultipartFormdataArrayOfBinary(files, Collections.emptyMap());
+  }
+
+
+  /**
+   * Test array of binary in multipart mime
+   * Test array of binary in multipart mime
+   * @param files  (required)
+   * @param additionalHeaders additionalHeaders for this call
+   * @return String
+   * @throws ApiException if fails to make API call
+   */
+  public String testBodyMultipartFormdataArrayOfBinary(List<File> files, Map<String, String> additionalHeaders) throws ApiException {
+    Object localVarPostBody = null;
+    
+    // verify the required parameter 'files' is set
+    if (files == null) {
+      throw new ApiException(400, "Missing the required parameter 'files' when calling testBodyMultipartFormdataArrayOfBinary");
+    }
+    
+    // create path and map variables
+    String localVarPath = "/body/application/octetstream/array_of_binary";
+
+    StringJoiner localVarQueryStringJoiner = new StringJoiner("&");
+    String localVarQueryParameterBaseName;
+    List<Pair> localVarQueryParams = new ArrayList<Pair>();
+    List<Pair> localVarCollectionQueryParams = new ArrayList<Pair>();
+    Map<String, String> localVarHeaderParams = new HashMap<String, String>();
+    Map<String, String> localVarCookieParams = new HashMap<String, String>();
+    Map<String, Object> localVarFormParams = new HashMap<String, Object>();
+
+    
+    localVarHeaderParams.putAll(additionalHeaders);
+
+    
+    if (files != null)
+      localVarFormParams.put("files", files);
+
+    final String[] localVarAccepts = {
+      "text/plain"
+    };
+    final String localVarAccept = apiClient.selectHeaderAccept(localVarAccepts);
+
+    final String[] localVarContentTypes = {
+      "multipart/form-data"
+    };
+    final String localVarContentType = apiClient.selectHeaderContentType(localVarContentTypes);
+
+    String[] localVarAuthNames = new String[] {  };
+
+    TypeReference<String> localVarReturnType = new TypeReference<String>() {};
+    return apiClient.invokeAPI(
+        localVarPath,
+        "POST",
+        localVarQueryParams,
+        localVarCollectionQueryParams,
+        localVarQueryStringJoiner.toString(),
+        localVarPostBody,
+        localVarHeaderParams,
+        localVarCookieParams,
+        localVarFormParams,
+        localVarAccept,
+        localVarContentType,
+        localVarAuthNames,
+        localVarReturnType
+    );
+  }
+
   /**
    * Test free form object
    * Test free form object