Changes to fetch the Original Message

spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/fileupload/config/ExceptionMessage.java

@@ -0,0 +1,55 @@
+package com.baeldung.cloud.openfeign.fileupload.config;
+
+public class ExceptionMessage {
+    private String timestamp;
+    private int status;
+    private String error;
+    private String message;
+    private String path;
+
+    public String getTimestamp() {
+        return timestamp;
+    }
+
+    public void setTimestamp(String timestamp) {
+        this.timestamp = timestamp;
+    }
+
+    public int getStatus() {
+        return status;
+    }
+
+    public void setStatus(int status) {
+        this.status = status;
+    }
+
+    public String getError() {
+        return error;
+    }
+
+    public void setError(String error) {
+        this.error = error;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+
+    public String getPath() {
+        return path;
+    }
+
+    public void setPath(String path) {
+        this.path = path;
+    }
+
+    @Override
+    public String toString() {
+        return "ExceptionMessage [timestamp=" + timestamp + ", status=" + status + ", error=" + error + ", message=" + message + ", path=" + path + "]";
+    }
+
+}

spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/fileupload/config/FeignSupportConfig.java

@@ -7,6 +7,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.web.client.RestTemplate;
 
 import feign.codec.Encoder;
+import feign.codec.ErrorDecoder;
 import feign.form.spring.SpringFormEncoder;
 
 public class FeignSupportConfig {
@@ -19,4 +20,9 @@ public class FeignSupportConfig {
             }
         }));
     }
+
+    @Bean
+    public ErrorDecoder errorDecoder() {
+        return new RetreiveMessageErrorDecoder();
+    }
 }

spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/fileupload/config/RetreiveMessageErrorDecoder.java

@@ -0,0 +1,35 @@
+package com.baeldung.cloud.openfeign.fileupload.config;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import com.baeldung.cloud.openfeign.exception.BadRequestException;
+import com.baeldung.cloud.openfeign.exception.NotFoundException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import feign.Response;
+import feign.codec.ErrorDecoder;
+
+public class RetreiveMessageErrorDecoder implements ErrorDecoder {
+    private final ErrorDecoder errorDecoder = new Default();
+
+    @Override
+    public Exception decode(String methodKey, Response response) {
+        ExceptionMessage message = null;
+        try (InputStream bodyIs = response.body()
+            .asInputStream()) {
+            ObjectMapper mapper = new ObjectMapper();
+            message = mapper.readValue(bodyIs, ExceptionMessage.class);
+        } catch (IOException e) {
+            return new Exception(e.getMessage());
+        }
+        switch (response.status()) {
+        case 400:
+            return new BadRequestException(message.getMessage() != null ? message.getMessage() : "Bad Request");
+        case 404:
+            return new NotFoundException(message.getMessage() != null ? message.getMessage() : "Not found");
+        default:
+            return errorDecoder.decode(methodKey, response);
+        }
+    }
+}

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

@@ -25,4 +25,9 @@ public class FileController {
         return service.uploadFileWithManualClient(file);
     }
     
+    @PostMapping(value = "/upload-error")
+    public String handleFileUploadError(@RequestPart(value = "file") MultipartFile file) {
+        return service.uploadFile(file);
+    }
+    
 }

spring-cloud/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/fileupload/service/UploadClient.java

@@ -12,4 +12,7 @@ import com.baeldung.cloud.openfeign.fileupload.config.FeignSupportConfig;
 public interface UploadClient {
     @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/spring-cloud-openfeign/src/main/java/com/baeldung/cloud/openfeign/fileupload/service/UploadService.java

@@ -26,4 +26,8 @@ public class UploadService {
         return client.fileUpload(file);
     }
     
+    public String uploadFileError(MultipartFile file) {
+        return client.fileUpload(file);
+    }
+    
 }