Avoid using import mapping in model generation (#11217)

* remove import mapping logic in model generation, better handle of file, list

* add new files for file, list

* fix some tests

* update tests, doc

* skip file as reserved word in feign client

* add new files

* remove file from reserved word list in spring generator

samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/api/PetApi.java

@@ -549,7 +549,7 @@ if (status != null)
    * 
    * @param petId ID of pet to update (required)
    * @param additionalMetadata Additional data to pass to server (optional)
-   * @param file file to upload (optional)
+   * @param _file file to upload (optional)
    * @return ModelApiResponse
    * @throws ApiException if fails to make API call
    * @http.response.details
@@ -558,8 +558,8 @@ if (status != null)
        <tr><td> 200 </td><td> successful operation </td><td>  -  </td></tr>
      </table>
    */
-  public ModelApiResponse uploadFile(Long petId, String additionalMetadata, File file) throws ApiException {
-    return uploadFileWithHttpInfo(petId, additionalMetadata, file).getData();
+  public ModelApiResponse uploadFile(Long petId, String additionalMetadata, File _file) throws ApiException {
+    return uploadFileWithHttpInfo(petId, additionalMetadata, _file).getData();
   }
 
   /**
@@ -567,7 +567,7 @@ if (status != null)
    * 
    * @param petId ID of pet to update (required)
    * @param additionalMetadata Additional data to pass to server (optional)
-   * @param file file to upload (optional)
+   * @param _file file to upload (optional)
    * @return ApiResponse&lt;ModelApiResponse&gt;
    * @throws ApiException if fails to make API call
    * @http.response.details
@@ -576,7 +576,7 @@ if (status != null)
        <tr><td> 200 </td><td> successful operation </td><td>  -  </td></tr>
      </table>
    */
-  public ApiResponse<ModelApiResponse> uploadFileWithHttpInfo(Long petId, String additionalMetadata, File file) throws ApiException {
+  public ApiResponse<ModelApiResponse> uploadFileWithHttpInfo(Long petId, String additionalMetadata, File _file) throws ApiException {
     Object localVarPostBody = null;
     
     // verify the required parameter 'petId' is set
@@ -599,8 +599,8 @@ if (status != null)
     
     if (additionalMetadata != null)
       localVarFormParams.put("additionalMetadata", additionalMetadata);
-if (file != null)
-      localVarFormParams.put("file", file);
+if (_file != null)
+      localVarFormParams.put("file", _file);
 
     final String[] localVarAccepts = {
       "application/json"

samples/client/petstore/java/jersey2-java8-localdatetime/src/main/java/org/openapitools/client/model/FileSchemaTestClass.java

@@ -26,6 +26,7 @@ import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.client.model.ModelFile;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
 import org.openapitools.client.JSON;
 
@@ -40,46 +41,46 @@ import org.openapitools.client.JSON;
 @javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen")
 public class FileSchemaTestClass {
   public static final String JSON_PROPERTY_FILE = "file";
-  private java.io.File file;
+  private ModelFile _file;
 
   public static final String JSON_PROPERTY_FILES = "files";
-  private List<java.io.File> files = null;
+  private List<ModelFile> files = null;
 
   public FileSchemaTestClass() { 
   }
 
-  public FileSchemaTestClass file(java.io.File file) {
-    this.file = file;
+  public FileSchemaTestClass _file(ModelFile _file) {
+    this._file = _file;
     return this;
   }
 
    /**
-   * Get file
-   * @return file
+   * Get _file
+   * @return _file
   **/
   @javax.annotation.Nullable
   @ApiModelProperty(value = "")
   @JsonProperty(JSON_PROPERTY_FILE)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
-  public java.io.File getFile() {
-    return file;
+  public ModelFile getFile() {
+    return _file;
   }
 
 
   @JsonProperty(JSON_PROPERTY_FILE)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
-  public void setFile(java.io.File file) {
-    this.file = file;
+  public void setFile(ModelFile _file) {
+    this._file = _file;
   }
 
 
-  public FileSchemaTestClass files(List<java.io.File> files) {
+  public FileSchemaTestClass files(List<ModelFile> files) {
     this.files = files;
     return this;
   }
 
-  public FileSchemaTestClass addFilesItem(java.io.File filesItem) {
+  public FileSchemaTestClass addFilesItem(ModelFile filesItem) {
     if (this.files == null) {
       this.files = new ArrayList<>();
     }
@@ -96,14 +97,14 @@ public class FileSchemaTestClass {
   @JsonProperty(JSON_PROPERTY_FILES)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
 
-  public List<java.io.File> getFiles() {
+  public List<ModelFile> getFiles() {
     return files;
   }
 
 
   @JsonProperty(JSON_PROPERTY_FILES)
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
-  public void setFiles(List<java.io.File> files) {
+  public void setFiles(List<ModelFile> files) {
     this.files = files;
   }
 
@@ -120,20 +121,20 @@ public class FileSchemaTestClass {
       return false;
     }
     FileSchemaTestClass fileSchemaTestClass = (FileSchemaTestClass) o;
-    return Objects.equals(this.file, fileSchemaTestClass.file) &&
+    return Objects.equals(this._file, fileSchemaTestClass._file) &&
         Objects.equals(this.files, fileSchemaTestClass.files);
   }
 
   @Override
   public int hashCode() {
-    return Objects.hash(file, files);
+    return Objects.hash(_file, files);
   }
 
   @Override
   public String toString() {
     StringBuilder sb = new StringBuilder();
     sb.append("class FileSchemaTestClass {\n");
-    sb.append("    file: ").append(toIndentedString(file)).append("\n");
+    sb.append("    _file: ").append(toIndentedString(_file)).append("\n");
     sb.append("    files: ").append(toIndentedString(files)).append("\n");
     sb.append("}");
     return sb.toString();