[JAVA] fix toUrlQueryString for BigDecimal (#15764)

* add MyImportTest.java

* fix original issue

* fix same issue for native library

* remove MyImportTest

* add test configs

* generate samples (again?)

* generate samples again

* generate samples again, undo pom.xml mistake [amended to retrigger circliCi]

samples/client/petstore/java/webclient/docs/FakeApi.md

@@ -4,6 +4,7 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 | Method | HTTP request | Description |
 |------------- | ------------- | -------------|
+| [**fakeBigDecimalMap**](FakeApi.md#fakeBigDecimalMap) | **GET** /fake/BigDecimalMap |  |
 | [**fakeHealthGet**](FakeApi.md#fakeHealthGet) | **GET** /fake/health | Health check endpoint |
 | [**fakeHttpSignatureTest**](FakeApi.md#fakeHttpSignatureTest) | **GET** /fake/http-signature-test | test http signature authentication |
 | [**fakeOuterBooleanSerialize**](FakeApi.md#fakeOuterBooleanSerialize) | **POST** /fake/outer/boolean |  |
@@ -24,6 +25,68 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 
 
+## fakeBigDecimalMap
+
+> FakeBigDecimalMap200Response fakeBigDecimalMap()
+
+
+
+for Java apache and Java native, test toUrlQueryString for maps with BegDecimal keys
+
+### 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.FakeApi;
+
+public class Example {
+    public static void main(String[] args) {
+        ApiClient defaultClient = Configuration.getDefaultApiClient();
+        defaultClient.setBasePath("http://petstore.swagger.io:80/v2");
+
+        FakeApi apiInstance = new FakeApi(defaultClient);
+        try {
+            FakeBigDecimalMap200Response result = apiInstance.fakeBigDecimalMap();
+            System.out.println(result);
+        } catch (ApiException e) {
+            System.err.println("Exception when calling FakeApi#fakeBigDecimalMap");
+            System.err.println("Status code: " + e.getCode());
+            System.err.println("Reason: " + e.getResponseBody());
+            System.err.println("Response headers: " + e.getResponseHeaders());
+            e.printStackTrace();
+        }
+    }
+}
+```
+
+### Parameters
+
+This endpoint does not need any parameter.
+
+### Return type
+
+[**FakeBigDecimalMap200Response**](FakeBigDecimalMap200Response.md)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: */*
+
+
+### HTTP response details
+| Status code | Description | Response headers |
+|-------------|-------------|------------------|
+| **200** | successful operation |  -  |
+
+
 ## fakeHealthGet
 
 > HealthCheckResult fakeHealthGet()

samples/client/petstore/java/webclient/docs/FakeBigDecimalMap200Response.md

@@ -0,0 +1,14 @@
+
+
+# FakeBigDecimalMap200Response
+
+
+## Properties
+
+| Name | Type | Description | Notes |
+|------------ | ------------- | ------------- | -------------|
+|**someId** | **BigDecimal** |  |  [optional] |
+|**someMap** | **Map<String, BigDecimal>** |  |  [optional] |
+
+
+