diff --git a/samples/client/petstore/spring-cloud/src/main/java/io/swagger/api/PetApi.java b/samples/client/petstore/spring-cloud/src/main/java/io/swagger/api/PetApi.java
index ff145451fe9..4d3e2792ebb 100644
--- a/samples/client/petstore/spring-cloud/src/main/java/io/swagger/api/PetApi.java
+++ b/samples/client/petstore/spring-cloud/src/main/java/io/swagger/api/PetApi.java
@@ -1,8 +1,8 @@
 package io.swagger.api;
 
-import java.io.File;
 import io.swagger.model.ModelApiResponse;
 import io.swagger.model.Pet;
+import org.springframework.core.io.Resource;
 
 import io.swagger.annotations.*;
 import org.springframework.http.ResponseEntity;
diff --git a/samples/client/petstore/spring-stubs/src/main/java/io/swagger/api/PetApi.java b/samples/client/petstore/spring-stubs/src/main/java/io/swagger/api/PetApi.java
index 6a733290a0b..617ad50e019 100644
--- a/samples/client/petstore/spring-stubs/src/main/java/io/swagger/api/PetApi.java
+++ b/samples/client/petstore/spring-stubs/src/main/java/io/swagger/api/PetApi.java
@@ -1,8 +1,8 @@
 package io.swagger.api;
 
-import java.io.File;
 import io.swagger.model.ModelApiResponse;
 import io.swagger.model.Pet;
+import org.springframework.core.io.Resource;
 
 import io.swagger.annotations.*;
 import org.springframework.http.ResponseEntity;
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/io/swagger/api/PetApi.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/io/swagger/api/PetApi.java
index 481c651fda1..4ee9bae9961 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/io/swagger/api/PetApi.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/io/swagger/api/PetApi.java
@@ -1,8 +1,8 @@
 package io.swagger.api;
 
-import java.io.File;
 import io.swagger.model.ModelApiResponse;
 import io.swagger.model.Pet;
+import org.springframework.core.io.Resource;
 
 import io.swagger.annotations.*;
 import org.springframework.http.HttpStatus;
diff --git a/samples/server/petstore/spring-mvc/src/main/java/io/swagger/api/PetApi.java b/samples/server/petstore/spring-mvc/src/main/java/io/swagger/api/PetApi.java
index 911092d3307..3cf98279345 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/io/swagger/api/PetApi.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/io/swagger/api/PetApi.java
@@ -1,8 +1,8 @@
 package io.swagger.api;
 
-import java.io.File;
 import io.swagger.model.ModelApiResponse;
 import io.swagger.model.Pet;
+import org.springframework.core.io.Resource;
 
 import io.swagger.annotations.*;
 import org.springframework.http.ResponseEntity;
diff --git a/samples/server/petstore/spring-mvc/src/main/java/io/swagger/api/PetApiController.java b/samples/server/petstore/spring-mvc/src/main/java/io/swagger/api/PetApiController.java
index 80a62f62c29..973055a2f11 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/io/swagger/api/PetApiController.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/io/swagger/api/PetApiController.java
@@ -1,8 +1,8 @@
 package io.swagger.api;
 
-import java.io.File;
 import io.swagger.model.ModelApiResponse;
 import io.swagger.model.Pet;
+import org.springframework.core.io.Resource;
 
 import io.swagger.annotations.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/io/swagger/api/PetApi.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/io/swagger/api/PetApi.java
index 911092d3307..3cf98279345 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/io/swagger/api/PetApi.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/io/swagger/api/PetApi.java
@@ -1,8 +1,8 @@
 package io.swagger.api;
 
-import java.io.File;
 import io.swagger.model.ModelApiResponse;
 import io.swagger.model.Pet;
+import org.springframework.core.io.Resource;
 
 import io.swagger.annotations.*;
 import org.springframework.http.ResponseEntity;
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/io/swagger/api/PetApiController.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/io/swagger/api/PetApiController.java
index 80a62f62c29..973055a2f11 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/io/swagger/api/PetApiController.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/io/swagger/api/PetApiController.java
@@ -1,8 +1,8 @@
 package io.swagger.api;
 
-import java.io.File;
 import io.swagger.model.ModelApiResponse;
 import io.swagger.model.Pet;
+import org.springframework.core.io.Resource;
 
 import io.swagger.annotations.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/io/swagger/api/PetApi.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/io/swagger/api/PetApi.java
index c924d5539d8..f310e2cdc0d 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/io/swagger/api/PetApi.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/io/swagger/api/PetApi.java
@@ -1,8 +1,8 @@
 package io.swagger.api;
 
-import java.io.File;
 import io.swagger.model.ModelApiResponse;
 import io.swagger.model.Pet;
+import org.springframework.core.io.Resource;
 
 import io.swagger.annotations.*;
 import org.springframework.http.HttpStatus;
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/io/swagger/api/PetApiController.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/io/swagger/api/PetApiController.java
index c498459bfb0..3c23ed5674a 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/io/swagger/api/PetApiController.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/io/swagger/api/PetApiController.java
@@ -1,8 +1,8 @@
 package io.swagger.api;
 
-import java.io.File;
 import io.swagger.model.ModelApiResponse;
 import io.swagger.model.Pet;
+import org.springframework.core.io.Resource;
 
 import io.swagger.annotations.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/io/swagger/api/PetApiDelegate.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/io/swagger/api/PetApiDelegate.java
index 7f89dfdabb4..265e7046956 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/io/swagger/api/PetApiDelegate.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/io/swagger/api/PetApiDelegate.java
@@ -1,8 +1,8 @@
 package io.swagger.api;
 
-import java.io.File;
 import io.swagger.model.ModelApiResponse;
 import io.swagger.model.Pet;
+import org.springframework.core.io.Resource;
 
 import io.swagger.annotations.*;
 import org.springframework.http.HttpStatus;
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/io/swagger/api/PetApi.java b/samples/server/petstore/springboot-delegate/src/main/java/io/swagger/api/PetApi.java
index 911092d3307..3cf98279345 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/io/swagger/api/PetApi.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/io/swagger/api/PetApi.java
@@ -1,8 +1,8 @@
 package io.swagger.api;
 
-import java.io.File;
 import io.swagger.model.ModelApiResponse;
 import io.swagger.model.Pet;
+import org.springframework.core.io.Resource;
 
 import io.swagger.annotations.*;
 import org.springframework.http.ResponseEntity;
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/io/swagger/api/PetApiController.java b/samples/server/petstore/springboot-delegate/src/main/java/io/swagger/api/PetApiController.java
index c498459bfb0..3c23ed5674a 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/io/swagger/api/PetApiController.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/io/swagger/api/PetApiController.java
@@ -1,8 +1,8 @@
 package io.swagger.api;
 
-import java.io.File;
 import io.swagger.model.ModelApiResponse;
 import io.swagger.model.Pet;
+import org.springframework.core.io.Resource;
 
 import io.swagger.annotations.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/io/swagger/api/PetApiDelegate.java b/samples/server/petstore/springboot-delegate/src/main/java/io/swagger/api/PetApiDelegate.java
index f028b3c2e77..fef5d600cc4 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/io/swagger/api/PetApiDelegate.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/io/swagger/api/PetApiDelegate.java
@@ -1,8 +1,8 @@
 package io.swagger.api;
 
-import java.io.File;
 import io.swagger.model.ModelApiResponse;
 import io.swagger.model.Pet;
+import org.springframework.core.io.Resource;
 
 import io.swagger.annotations.*;
 import org.springframework.http.ResponseEntity;
diff --git a/samples/server/petstore/springboot/src/main/java/io/swagger/api/PetApi.java b/samples/server/petstore/springboot/src/main/java/io/swagger/api/PetApi.java
index 911092d3307..3cf98279345 100644
--- a/samples/server/petstore/springboot/src/main/java/io/swagger/api/PetApi.java
+++ b/samples/server/petstore/springboot/src/main/java/io/swagger/api/PetApi.java
@@ -1,8 +1,8 @@
 package io.swagger.api;
 
-import java.io.File;
 import io.swagger.model.ModelApiResponse;
 import io.swagger.model.Pet;
+import org.springframework.core.io.Resource;
 
 import io.swagger.annotations.*;
 import org.springframework.http.ResponseEntity;
diff --git a/samples/server/petstore/springboot/src/main/java/io/swagger/api/PetApiController.java b/samples/server/petstore/springboot/src/main/java/io/swagger/api/PetApiController.java
index 80a62f62c29..973055a2f11 100644
--- a/samples/server/petstore/springboot/src/main/java/io/swagger/api/PetApiController.java
+++ b/samples/server/petstore/springboot/src/main/java/io/swagger/api/PetApiController.java
@@ -1,8 +1,8 @@
 package io.swagger.api;
 
-import java.io.File;
 import io.swagger.model.ModelApiResponse;
 import io.swagger.model.Pet;
+import org.springframework.core.io.Resource;
 
 import io.swagger.annotations.*;