Issue #4788: remove System.getProperty from language codegens.

It was just used for apiPackage/modelPackage, for which we have regular parameters.

Author: Paŭlo Ebermann

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/JavaInflectorServerCodegen.java

@@ -34,9 +34,16 @@ public JavaInflectorServerCodegen() {
         modelDocTemplateFiles.remove("model_doc.mustache");
         apiDocTemplateFiles.remove("api_doc.mustache");
 
+        if(System.getProperty("swagger.codegen.inflector.apipackage") != null) {
+            LOGGER.warn("System property 'swagger.codegen.inflector.apipackage' is not supported anymore, use the standard apiPackage parameter.");
+        }
+
+        if(System.getProperty("swagger.codegen.inflector.modelpackage") != null) {
+            LOGGER.warn("System property 'swagger.codegen.inflector.modelpackage' is not supported anymore, please use the standard modelPackage parameter.");
+        }
 
-        apiPackage = System.getProperty("swagger.codegen.inflector.apipackage", "io.swagger.handler");
-        modelPackage = System.getProperty("swagger.codegen.inflector.modelpackage", "io.swagger.model");
+        apiPackage = "io.swagger.handler";
+        modelPackage = "io.swagger.model";
 
         additionalProperties.put("title", title);
         // java inflector uses the jackson lib

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/UndertowCodegen.java

@@ -36,9 +36,16 @@ public UndertowCodegen() {
         modelDocTemplateFiles.remove("model_doc.mustache");
         apiDocTemplateFiles.remove("api_doc.mustache");
 
+        if(System.getProperty("swagger.codegen.undertow.apipackage") != null) {
+            LOGGER.warn("System property 'swagger.codegen.undertow.apipackage' is not supported anymore, use the standard apiPackage parameter.");
+        }
+
+        if(System.getProperty("swagger.codegen.undertow.modelpackage") != null) {
+            LOGGER.warn("System property 'swagger.codegen.undertow.modelpackage' is not supported anymore, please use the standard modelPackage parameter.");
+        }
 
-        apiPackage = System.getProperty("swagger.codegen.undertow.apipackage", "io.swagger.handler");
-        modelPackage = System.getProperty("swagger.codegen.undertow.modelpackage", "io.swagger.model");
+        apiPackage = "io.swagger.handler";
+        modelPackage = "io.swagger.model";
 
         additionalProperties.put("title", title);
     }