Changes to add fallback option.

spring-cloud-modules/spring-cloud-openfeign-2/src/main/java/com/baeldung/cloud/openfeign/fileupload/controller/FileController.java

@@ -15,20 +15,26 @@ public class FileController {
     @Autowired
     private UploadService service;
     
-    @PostMapping(value = "/upload")
-    public String handleFileUpload(@RequestPart(value = "file") MultipartFile file) {
-        return service.uploadFile(file);
-    }
-    
     @PostMapping(value = "/upload-mannual-client")
     public boolean handleFileUploadWithManualClient(
             @RequestPart(value = "file") MultipartFile file) {
         return service.uploadFileWithManualClient(file);
     }
     
-    @PostMapping(value = "/upload-error")
+    @PostMapping(value = "/upload-file")
-    public String handleFileUploadError(@RequestPart(value = "file") MultipartFile file) throws NotFoundException {
+    public boolean handleFileUpload(@RequestPart(value = "file") MultipartFile file) {
-        return service.uploadFileWithCause(file);
+        return service.uploadFileWithManualClient(file);
+    }
+
+    @PostMapping(value = "/upload-with-fallbackfactory")
+    public String uploadFileWithFallbackFactory(@RequestPart(value = "file") MultipartFile file)
+            throws NotFoundException {
+        return service.uploadFileWithFallbackFactory(file);
+    }
+
+    @PostMapping(value = "/upload-with-fallback")
+    public String uploadFileWithFallback(@RequestPart(value = "file") MultipartFile file) throws NotFoundException {
+        return service.uploadFileWithFallback(file);
     }
 
 }

spring-cloud-modules/spring-cloud-openfeign-2/src/main/java/com/baeldung/cloud/openfeign/fileupload/service/FileUploadClientFallbackFactory.java

@@ -8,10 +8,10 @@ import com.baeldung.cloud.openfeign.exception.BadRequestException;
 import com.baeldung.cloud.openfeign.exception.NotFoundException;
 
 @Component
-public class FileUploadClientFallbackFactory implements FallbackFactory<FileUploadClient> {
+public class FileUploadClientFallbackFactory implements FallbackFactory<FileUploadClientWithFallbackFactory> {
     @Override
-    public FileUploadClient create(Throwable cause) {
+    public FileUploadClientWithFallbackFactory create(Throwable cause) {
-        return new FileUploadClient() {
+        return new FileUploadClientWithFallbackFactory() {
             @Override
             public String fileUpload(MultipartFile file) {
                 if (cause instanceof BadRequestException) {

spring-cloud-modules/spring-cloud-openfeign-2/src/main/java/com/baeldung/cloud/openfeign/fileupload/service/FileUploadClientWithFallBack.java

@@ -8,8 +8,8 @@ import org.springframework.web.multipart.MultipartFile;
 
 import com.baeldung.cloud.openfeign.fileupload.config.FeignSupportConfig;
 
-@FeignClient(name = "file", url = "http://localhost:8081", configuration = FeignSupportConfig.class, fallbackFactory = FileUploadClientFallbackFactory.class)
+@FeignClient(name = "file", url = "http://localhost:8080", configuration = FeignSupportConfig.class, fallback = FileUploadClientWithFallbackImpl.class)
-public interface FileUploadClient {
+public interface FileUploadClientWithFallBack {
 	@PostMapping(value = "/upload-file", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
 	String fileUpload(@RequestPart(value = "file") MultipartFile file);
 }

spring-cloud-modules/spring-cloud-openfeign-2/src/main/java/com/baeldung/cloud/openfeign/fileupload/service/FileUploadClientWithFallbackFactory.java

@@ -8,11 +8,8 @@ import org.springframework.web.multipart.MultipartFile;
 
 import com.baeldung.cloud.openfeign.fileupload.config.FeignSupportConfig;
 
-@FeignClient(name = "file", url = "http://localhost:8081", configuration = FeignSupportConfig.class)
+@FeignClient(name = "file", url = "http://localhost:8080", configuration = FeignSupportConfig.class, fallbackFactory = FileUploadClientFallbackFactory.class)
-public interface UploadClient {
+public interface FileUploadClientWithFallbackFactory {
     @PostMapping(value = "/upload-file", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
     String fileUpload(@RequestPart(value = "file") MultipartFile file);
-    
-    @PostMapping(value = "/upload-file-error", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
-    String fileUploadError(@RequestPart(value = "file") MultipartFile file);
 }

spring-cloud-modules/spring-cloud-openfeign-2/src/main/java/com/baeldung/cloud/openfeign/fileupload/service/FileUploadClientWithFallbackImpl.java

@@ -0,0 +1,31 @@
+package com.baeldung.cloud.openfeign.fileupload.service;
+
+import org.springframework.stereotype.Component;
+import org.springframework.web.multipart.MultipartFile;
+
+import com.baeldung.cloud.openfeign.exception.BadRequestException;
+import com.baeldung.cloud.openfeign.exception.NotFoundException;
+
+@Component
+public class FileUploadClientWithFallbackImpl implements FileUploadClientWithFallBack {
+
+    @Override
+    public String fileUpload(MultipartFile file) {
+        try {
+            throw new NotFoundException("hi, something wrong");
+        } catch (Exception ex) {
+
+            if (ex instanceof BadRequestException) {
+                return "Bad Request!!!";
+            }
+            if (ex instanceof NotFoundException) {
+                return "Not Found!!!";
+            }
+            if (ex instanceof Exception) {
+                return "Exception!!!";
+            }
+            return "Successfully Uploaded file!!!";
+        }
+    }
+
+}

spring-cloud-modules/spring-cloud-openfeign-2/src/main/java/com/baeldung/cloud/openfeign/fileupload/service/UploadService.java

@@ -12,12 +12,12 @@ import feign.form.spring.SpringFormEncoder;
 
 @Service
 public class UploadService {
-    private static final String HTTP_FILE_UPLOAD_URL = "http://localhost:8081";
+    private static final String HTTP_FILE_UPLOAD_URL = "http://localhost:8080";
     
     @Autowired
-    private UploadClient client;
+    private FileUploadClientWithFallbackFactory fileUploadClient;
     @Autowired
-    private FileUploadClient fileUploadClient;
+    private FileUploadClientWithFallBack fileUploadClientWithFallback;
     
     public boolean uploadFileWithManualClient(MultipartFile file) {
         UploadResource fileUploadResource = Feign.builder().encoder(new SpringFormEncoder())
@@ -26,11 +26,11 @@ public class UploadService {
         return response.status() == 200;
     }
 
-    public String uploadFile(MultipartFile file) {
+    public String uploadFileWithFallbackFactory(MultipartFile file) throws NotFoundException {
-        return client.fileUpload(file);
-    }
-
-    public String uploadFileWithCause(MultipartFile file) throws NotFoundException {
         return fileUploadClient.fileUpload(file);
     }
+
+    public String uploadFileWithFallback(MultipartFile file) throws NotFoundException {
+        return fileUploadClientWithFallback.fileUpload(file);
+    }
 }