JAVA-11240 Moved spring-cloud to spring-cloud-modules

2022-05-29 19:32:17 +05:30
parent a7cae2e766
commit 85d134952e
934 changed files with 35 additions and 230 deletions
@@ -0,0 +1,16 @@
+package com.baeldung.cloud.openfeign;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.openfeign.EnableFeignClients;
+
+@SpringBootApplication
+@EnableFeignClients
+public class ExampleApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(ExampleApplication.class, args);
+    }
+
+}
+
@@ -0,0 +1,25 @@
+package com.baeldung.cloud.openfeign.client;
+
+import com.baeldung.cloud.openfeign.config.ClientConfiguration;
+import com.baeldung.cloud.openfeign.hystrix.JSONPlaceHolderFallback;
+import com.baeldung.cloud.openfeign.model.Post;
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+import java.util.List;
+
+@FeignClient(value = "jplaceholder",
+        url = "https://jsonplaceholder.typicode.com/",
+        configuration = ClientConfiguration.class,
+        fallback = JSONPlaceHolderFallback.class)
+public interface JSONPlaceHolderClient {
+
+    @RequestMapping(method = RequestMethod.GET, value = "/posts")
+    List<Post> getPosts();
+
+
+    @RequestMapping(method = RequestMethod.GET, value = "/posts/{postId}", produces = "application/json")
+    Post getPostById(@PathVariable("postId") Long postId);
+}
@@ -0,0 +1,16 @@
+package com.baeldung.cloud.openfeign.client;
+
+import com.baeldung.cloud.openfeign.model.Payment;
+import com.baeldung.cloud.openfeign.oauthfeign.OAuthFeignConfig;
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+import java.util.List;
+
+@FeignClient(name = "payment-client", url = "http://localhost:8081/resource-server-jwt", configuration = OAuthFeignConfig.class)
+public interface PaymentClient {
+
+    @RequestMapping(value = "/payments", method = RequestMethod.GET)
+    List<Payment> getPayments();
+}
@@ -0,0 +1,13 @@
+package com.baeldung.cloud.openfeign.client;
+
+import com.baeldung.cloud.openfeign.config.FeignConfig;
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+@FeignClient(name = "user-client", url="https://jsonplaceholder.typicode.com", configuration = FeignConfig.class)
+public interface UserClient {
+
+	@RequestMapping(value = "/users", method = RequestMethod.GET)
+	String getUsers();
+}
@@ -0,0 +1,43 @@
+package com.baeldung.cloud.openfeign.config;
+
+import feign.Logger;
+import feign.RequestInterceptor;
+import feign.auth.BasicAuthRequestInterceptor;
+import feign.codec.ErrorDecoder;
+import feign.okhttp.OkHttpClient;
+import org.apache.http.entity.ContentType;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class ClientConfiguration {
+
+    @Bean
+    public Logger.Level feignLoggerLevel() {
+        return Logger.Level.FULL;
+    }
+
+    @Bean
+    public ErrorDecoder errorDecoder() {
+        return new ErrorDecoder.Default();
+    }
+
+    @Bean
+    public OkHttpClient client() {
+        return new OkHttpClient();
+    }
+
+    @Bean
+    public RequestInterceptor requestInterceptor() {
+        return requestTemplate -> {
+            requestTemplate.header("user", "ajeje");
+            requestTemplate.header("password", "brazof");
+            requestTemplate.header("Accept", ContentType.APPLICATION_JSON.getMimeType());
+        };
+    }
+
+    // @Bean - uncomment to use this interceptor and remove @Bean from the requestInterceptor()
+    public BasicAuthRequestInterceptor basicAuthRequestInterceptor() {
+        return new BasicAuthRequestInterceptor("ajeje", "brazof");
+    }
+}
@@ -0,0 +1,21 @@
+package com.baeldung.cloud.openfeign.config;
+
+import com.baeldung.cloud.openfeign.exception.BadRequestException;
+import com.baeldung.cloud.openfeign.exception.NotFoundException;
+import feign.Response;
+import feign.codec.ErrorDecoder;
+
+public class CustomErrorDecoder implements ErrorDecoder {
+    @Override
+    public Exception decode(String methodKey, Response response) {
+
+        switch (response.status()){
+            case 400:
+                return new BadRequestException();
+            case 404:
+                return new NotFoundException();
+            default:
+                return new Exception("Generic error");
+        }
+    }
+}
@@ -0,0 +1,12 @@
+package com.baeldung.cloud.openfeign.config;
+
+import feign.Logger;
+import org.springframework.context.annotation.Bean;
+
+public class FeignConfig {
+
+	@Bean
+	Logger.Level feignLoggerLevel() {
+		return Logger.Level.FULL;
+	}
+}
@@ -0,0 +1,24 @@
+package com.baeldung.cloud.openfeign.controller;
+
+import com.baeldung.cloud.openfeign.client.PaymentClient;
+import com.baeldung.cloud.openfeign.model.Payment;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@RestController
+public class PaymentController {
+
+    private final PaymentClient paymentClient;
+
+    public PaymentController(PaymentClient paymentClient) {
+        this.paymentClient = paymentClient;
+    }
+
+    @GetMapping("/payments")
+    public List<Payment> getPayments() {
+        List<Payment> payments = paymentClient.getPayments();
+        return payments;
+    }
+}
@@ -0,0 +1,21 @@
+package com.baeldung.cloud.openfeign.exception;
+
+public class BadRequestException extends Exception {
+
+    public BadRequestException() {
+    }
+
+    public BadRequestException(String message) {
+        super(message);
+    }
+
+    public BadRequestException(Throwable cause) {
+        super(cause);
+    }
+
+    @Override
+    public String toString() {
+        return "BadRequestException: "+getMessage();
+    }
+
+}
@@ -0,0 +1,21 @@
+package com.baeldung.cloud.openfeign.exception;
+
+public class NotFoundException extends Exception {
+
+    public NotFoundException() {
+    }
+
+    public NotFoundException(String message) {
+        super(message);
+    }
+
+    public NotFoundException(Throwable cause) {
+        super(cause);
+    }
+
+    @Override
+    public String toString() {
+        return "NotFoundException: "+getMessage();
+    }
+
+}
@@ -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 + "]";
+    }
+
+}
@@ -0,0 +1,28 @@
+package com.baeldung.cloud.openfeign.fileupload.config;
+
+import org.springframework.beans.factory.ObjectFactory;
+import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
+import org.springframework.cloud.openfeign.support.SpringEncoder;
+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 {
+    @Bean
+    public Encoder multipartFormEncoder() {
+        return new SpringFormEncoder(new SpringEncoder(new ObjectFactory<HttpMessageConverters>() {
+            @Override
+            public HttpMessageConverters getObject() {
+                return new HttpMessageConverters(new RestTemplate().getMessageConverters());
+            }
+        }));
+    }
+
+    @Bean
+    public ErrorDecoder errorDecoder() {
+        return new RetreiveMessageErrorDecoder();
+    }
+}
@@ -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);
+        }
+    }
+}
@@ -0,0 +1,33 @@
+package com.baeldung.cloud.openfeign.fileupload.controller;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestPart;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.multipart.MultipartFile;
+
+import com.baeldung.cloud.openfeign.fileupload.service.UploadService;
+
+@RestController
+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")
+    public String handleFileUploadError(@RequestPart(value = "file") MultipartFile file) {
+        return service.uploadFile(file);
+    }
+    
+}
@@ -0,0 +1,18 @@
+package com.baeldung.cloud.openfeign.fileupload.service;
+
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestPart;
+import org.springframework.web.multipart.MultipartFile;
+
+import com.baeldung.cloud.openfeign.fileupload.config.FeignSupportConfig;
+
+@FeignClient(name = "file", url = "http://localhost:8081", configuration = FeignSupportConfig.class)
+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);
+}
@@ -0,0 +1,16 @@
+package com.baeldung.cloud.openfeign.fileupload.service;
+
+import org.springframework.web.multipart.MultipartFile;
+
+import feign.Headers;
+import feign.Param;
+import feign.RequestLine;
+import feign.Response;
+
+public interface UploadResource {
+    
+    @RequestLine("POST /upload-file")
+    @Headers("Content-Type: multipart/form-data")
+    Response uploadFile(@Param("file") MultipartFile file);
+    
+}
@@ -0,0 +1,33 @@
+package com.baeldung.cloud.openfeign.fileupload.service;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.web.multipart.MultipartFile;
+
+import feign.Feign;
+import feign.Response;
+import feign.form.spring.SpringFormEncoder;
+
+@Service
+public class UploadService {
+    private static final String HTTP_FILE_UPLOAD_URL = "http://localhost:8081";
+    
+    @Autowired
+    private UploadClient client;
+    
+    public boolean uploadFileWithManualClient(MultipartFile file) {
+        UploadResource fileUploadResource = Feign.builder().encoder(new SpringFormEncoder())
+                .target(UploadResource.class, HTTP_FILE_UPLOAD_URL);
+        Response response = fileUploadResource.uploadFile(file);
+        return response.status() == 200;
+    }
+    
+    public String uploadFile(MultipartFile file) {
+        return client.fileUpload(file);
+    }
+    
+    public String uploadFileError(MultipartFile file) {
+        return client.fileUpload(file);
+    }
+    
+}
@@ -0,0 +1,22 @@
+package com.baeldung.cloud.openfeign.hystrix;
+
+import com.baeldung.cloud.openfeign.client.JSONPlaceHolderClient;
+import com.baeldung.cloud.openfeign.model.Post;
+import org.springframework.stereotype.Component;
+
+import java.util.Collections;
+import java.util.List;
+
+@Component
+public class JSONPlaceHolderFallback implements JSONPlaceHolderClient {
+
+    @Override
+    public List<Post> getPosts() {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public Post getPostById(Long postId) {
+        return null;
+    }
+}
@@ -0,0 +1,23 @@
+package com.baeldung.cloud.openfeign.model;
+
+public class Payment {
+
+    private String id;
+    private double amount;
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public double getAmount() {
+        return amount;
+    }
+
+    public void setAmount(double amount) {
+        this.amount = amount;
+    }
+}
@@ -0,0 +1,41 @@
+package com.baeldung.cloud.openfeign.model;
+
+public class Post {
+
+    private String userId;
+    private Long id;
+    private String title;
+    private String body;
+
+    public String getUserId() {
+        return userId;
+    }
+
+    public void setUserId(String userId) {
+        this.userId = userId;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getBody() {
+        return body;
+    }
+
+    public void setBody(String body) {
+        this.body = body;
+    }
+}
@@ -0,0 +1,19 @@
+package com.baeldung.cloud.openfeign.oauthfeign;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+
+@Configuration
+public class OAuth2WebSecurityConfigurerAdapter extends WebSecurityConfigurerAdapter {
+
+    @Override
+    protected void configure(HttpSecurity http) throws Exception {
+        http
+            .csrf()
+            .disable()
+            .oauth2Client();
+        http
+            .authorizeRequests().anyRequest().permitAll();
+    }
+}
@@ -0,0 +1,85 @@
+package com.baeldung.cloud.openfeign.oauthfeign;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.oauth2.client.OAuth2AuthorizeRequest;
+import org.springframework.security.oauth2.client.OAuth2AuthorizedClient;
+import org.springframework.security.oauth2.client.OAuth2AuthorizedClientManager;
+import org.springframework.security.oauth2.client.registration.ClientRegistration;
+
+import java.util.Collection;
+import java.util.Collections;
+
+import static java.util.Objects.isNull;
+
+public class OAuthClientCredentialsFeignManager {
+
+    private static final Logger logger = LoggerFactory.getLogger(OAuthClientCredentialsFeignManager.class);
+
+    private final OAuth2AuthorizedClientManager manager;
+    private final Authentication principal;
+    private final ClientRegistration clientRegistration;
+
+    public OAuthClientCredentialsFeignManager(OAuth2AuthorizedClientManager manager, ClientRegistration clientRegistration) {
+        this.manager = manager;
+        this.clientRegistration = clientRegistration;
+        this.principal = createPrincipal();
+    }
+
+    private Authentication createPrincipal() {
+        return new Authentication() {
+            @Override
+            public Collection<? extends GrantedAuthority> getAuthorities() {
+                return Collections.emptySet();
+            }
+
+            @Override
+            public Object getCredentials() {
+                return null;
+            }
+
+            @Override
+            public Object getDetails() {
+                return null;
+            }
+
+            @Override
+            public Object getPrincipal() {
+                return this;
+            }
+
+            @Override
+            public boolean isAuthenticated() {
+                return false;
+            }
+
+            @Override
+            public void setAuthenticated(boolean isAuthenticated) throws IllegalArgumentException {
+            }
+
+            @Override
+            public String getName() {
+                return clientRegistration.getClientId();
+            }
+        };
+    }
+
+    public String getAccessToken() {
+        try {
+            OAuth2AuthorizeRequest oAuth2AuthorizeRequest = OAuth2AuthorizeRequest
+                .withClientRegistrationId(clientRegistration.getRegistrationId())
+                .principal(principal)
+                .build();
+            OAuth2AuthorizedClient client = manager.authorize(oAuth2AuthorizeRequest);
+            if (isNull(client)) {
+                throw new IllegalStateException("client credentials flow on " + clientRegistration.getRegistrationId() + " failed, client is null");
+            }
+            return client.getAccessToken().getTokenValue();
+        } catch (Exception exp) {
+            logger.error("client credentials error " + exp.getMessage());
+        }
+        return null;
+    }
+}
@@ -0,0 +1,46 @@
+package com.baeldung.cloud.openfeign.oauthfeign;
+
+import feign.RequestInterceptor;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.oauth2.client.*;
+import org.springframework.security.oauth2.client.registration.ClientRegistration;
+import org.springframework.security.oauth2.client.registration.ClientRegistrationRepository;
+
+@Configuration
+public class OAuthFeignConfig {
+
+    public static final String CLIENT_REGISTRATION_ID = "keycloak";
+
+    private final OAuth2AuthorizedClientService oAuth2AuthorizedClientService;
+    private final ClientRegistrationRepository clientRegistrationRepository;
+
+    public OAuthFeignConfig(OAuth2AuthorizedClientService oAuth2AuthorizedClientService,
+            ClientRegistrationRepository clientRegistrationRepository) {
+        this.oAuth2AuthorizedClientService = oAuth2AuthorizedClientService;
+        this.clientRegistrationRepository = clientRegistrationRepository;
+    }
+
+    @Bean
+    public RequestInterceptor requestInterceptor() {
+        ClientRegistration clientRegistration = clientRegistrationRepository.findByRegistrationId(CLIENT_REGISTRATION_ID);
+        OAuthClientCredentialsFeignManager clientCredentialsFeignManager =
+            new OAuthClientCredentialsFeignManager(authorizedClientManager(), clientRegistration);
+        return requestTemplate -> {
+            requestTemplate.header("Authorization", "Bearer " + clientCredentialsFeignManager.getAccessToken());
+        };
+    }
+
+    @Bean
+    OAuth2AuthorizedClientManager authorizedClientManager() {
+        OAuth2AuthorizedClientProvider authorizedClientProvider = OAuth2AuthorizedClientProviderBuilder.builder()
+            .clientCredentials()
+            .build();
+
+        AuthorizedClientServiceOAuth2AuthorizedClientManager authorizedClientManager =
+            new AuthorizedClientServiceOAuth2AuthorizedClientManager(clientRegistrationRepository, oAuth2AuthorizedClientService);
+        authorizedClientManager.setAuthorizedClientProvider(authorizedClientProvider);
+        return authorizedClientManager;
+    }
+
+}
@@ -0,0 +1,12 @@
+package com.baeldung.cloud.openfeign.service;
+
+import com.baeldung.cloud.openfeign.model.Post;
+
+import java.util.List;
+
+public interface JSONPlaceHolderService {
+
+    List<Post> getPosts();
+
+    Post getPostById(Long id);
+}
@@ -0,0 +1,26 @@
+package com.baeldung.cloud.openfeign.service.impl;
+
+import com.baeldung.cloud.openfeign.client.JSONPlaceHolderClient;
+import com.baeldung.cloud.openfeign.model.Post;
+import com.baeldung.cloud.openfeign.service.JSONPlaceHolderService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class JSONPlaceHolderServiceImpl implements JSONPlaceHolderService {
+
+    @Autowired
+    private JSONPlaceHolderClient jsonPlaceHolderClient;
+
+    @Override
+    public List<Post> getPosts() {
+        return jsonPlaceHolderClient.getPosts();
+    }
+
+    @Override
+    public Post getPostById(Long id) {
+        return jsonPlaceHolderClient.getPostById(id);
+    }
+}
@@ -0,0 +1,10 @@
+server.port=8085
+spring.main.allow-bean-definition-overriding=true
+spring.application.name= openfeign
+logging.level.com.baeldung.cloud.openfeign.client: DEBUG
+feign.hystrix.enabled=true
+
+spring.security.oauth2.client.registration.keycloak.authorization-grant-type=client_credentials
+spring.security.oauth2.client.registration.keycloak.client-id=payment-app
+spring.security.oauth2.client.registration.keycloak.client-secret=863e9de4-33d4-4471-b35e-f8d2434385bb
+spring.security.oauth2.client.provider.keycloak.token-uri=http://localhost:8083/auth/realms/master/protocol/openid-connect/token
@@ -0,0 +1,50 @@
+package com.baeldung.cloud.openfeign;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+
+import org.apache.commons.io.IOUtils;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.mock.web.MockMultipartFile;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.web.multipart.MultipartFile;
+
+import com.baeldung.cloud.openfeign.fileupload.service.UploadService;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class OpenFeignFileUploadLiveTest {
+    
+    @Autowired
+    private UploadService uploadService;
+    
+    private static String FILE_NAME = "fileupload.txt";
+    
+    @Test
+    public void whenFeignBuilder_thenFileUploadSuccess() throws IOException {
+        ClassLoader classloader = Thread.currentThread().getContextClassLoader();
+        File file = new File(classloader.getResource(FILE_NAME).getFile());
+        Assert.assertTrue(file.exists());
+        FileInputStream input = new FileInputStream(file);
+        MultipartFile multipartFile = new MockMultipartFile("file", file.getName(), "text/plain",
+                IOUtils.toByteArray(input));
+        Assert.assertTrue(uploadService.uploadFileWithManualClient(multipartFile));
+    }
+    
+    @Test
+    public void whenAnnotatedFeignClient_thenFileUploadSuccess() throws IOException {
+        ClassLoader classloader = Thread.currentThread().getContextClassLoader();
+        File file = new File(classloader.getResource(FILE_NAME).getFile());
+        Assert.assertTrue(file.exists());
+        FileInputStream input = new FileInputStream(file);
+        MultipartFile multipartFile = new MockMultipartFile("file", file.getName(), "text/plain",
+                IOUtils.toByteArray(input));
+        String uploadFile = uploadService.uploadFile(multipartFile);
+        Assert.assertNotNull(uploadFile);
+    }
+}
@@ -0,0 +1,43 @@
+package com.baeldung.cloud.openfeign;
+
+import com.baeldung.cloud.openfeign.model.Post;
+import com.baeldung.cloud.openfeign.service.JSONPlaceHolderService;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.util.List;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class OpenFeignManualTest {
+
+    @Autowired
+    private JSONPlaceHolderService jsonPlaceHolderService;
+
+    @Test
+    public void whenSpringContextIsBootstrapped_thenNoExceptions() {
+    }
+
+    @Test
+    public void whenGetPosts_thenListPostSizeGreaterThanZero() {
+
+        List<Post> posts = jsonPlaceHolderService.getPosts();
+
+        assertFalse(posts.isEmpty());
+    }
+
+    @Test
+    public void whenGetPostWithId_thenPostExist() {
+
+        Post post = jsonPlaceHolderService.getPostById(1L);
+
+        assertNotNull(post);
+    }
+
+}
@@ -0,0 +1,44 @@
+package com.baeldung.cloud.openfeign;
+
+import com.baeldung.cloud.openfeign.client.PaymentClient;
+import com.baeldung.cloud.openfeign.model.Payment;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.util.List;
+
+import static org.junit.Assert.assertFalse;
+
+/**
+ * This test can be used to verify OAuth2 Token functionality with Feign client
+ * (https://www.baeldung.com/spring-cloud-feign-oauth-token).
+ *
+ * The following components should be setup and running, as described in the article, prior to running this test.
+ *
+ * Authorization Server - embedded Keycloak server with the correct client and client-secret defined in the master realm.
+ * This will issue the auth tokens used by Feign client.
+ * Further details are available at: https://www.baeldung.com/keycloak-embedded-in-spring-boot-app
+ *
+ * Resource Server - OAuth resource server requiring valid JWT token (issued by the Authorization Server).
+ * Further details are available at: https://www.baeldung.com/spring-security-oauth-resource-server
+ *
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class OpenFeignOAuth2ManualTest {
+
+    @Autowired
+    private PaymentClient paymentClient;
+
+    @Test
+    public void whenGetPayment_thenListPayments() {
+
+        List<Payment> payments = paymentClient.getPayments();
+
+        assertFalse(payments.isEmpty());
+    }
+
+}
@@ -0,0 +1,16 @@
+package com.baeldung.cloud.openfeign;
+
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = ExampleApplication.class)
+public class SpringContextTest {
+    
+    @Test
+    public void whenSpringContextIsBootstrapped_thenNoExceptions() {
+    }
+}