Sample Hystrix implementation

spring-cloud-hystrix/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.baeldung.spring.cloud</groupId>
+    <artifactId>spring-cloud-hystrix</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <modules>
+        <module>spring-cloud-hystrix-rest-producer</module>
+        <module>spring-cloud-hystrix-rest-consumer</module>
+    </modules>
+    <packaging>pom</packaging>
+
+    <name>Spring Cloud Hystrix</name>
+    <description>Spring Cloud Hystrix Demo</description>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>..</relativePath>
+    </parent>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <build>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-compiler-plugin</artifactId>
+                    <version>3.5.1</version>
+                    <configuration>
+                        <source>1.8</source>
+                        <target>1.8</target>
+                    </configuration>
+                </plugin>
+                <plugin>
+                    <groupId>org.springframework.boot</groupId>
+                    <artifactId>spring-boot-maven-plugin</artifactId>
+                    <version>1.4.0.RELEASE</version>
+                </plugin>
+            </plugins>
+        </pluginManagement>
+    </build>
+</project>

spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>spring-cloud-hystrix-rest-consumer</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>Spring Cloud Hystrix REST Consumer</name>
+    <description>Spring Cloud Hystrix Sample Implementation</description>
+
+    <parent>
+        <groupId>com.baeldung.spring.cloud</groupId>
+        <artifactId>spring-cloud-hystrix</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>..</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-hystrix</artifactId>
+            <version>1.1.5.RELEASE</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+            <version>1.4.0.RELEASE</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-thymeleaf</artifactId>
+            <version>1.4.0.RELEASE</version>
+        </dependency>
+    </dependencies>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.cloud</groupId>
+                <artifactId>spring-cloud-starter-parent</artifactId>
+                <version>Brixton.SR4</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+            </plugin>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/consumer/GreetingService.java

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+package com.baeldung.spring.cloud.hystrix.rest.consumer;
+
+import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+@Service
+public class GreetingService {
+    @HystrixCommand(fallbackMethod = "defaultGreeting")
+    public String getGreeting(String username) {
+        return new RestTemplate().getForObject("http://localhost:9090/greeting/{username}", String.class, username);
+    }
+
+    private String defaultGreeting(String username) {
+        return "Hello User!";
+    }
+}

spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/consumer/RestConsumerApplication.java

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+package com.baeldung.spring.cloud.hystrix.rest.consumer;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@SpringBootApplication
+@EnableCircuitBreaker
+@Controller
+public class RestConsumerApplication {
+    @Autowired
+    private GreetingService greetingService;
+
+    public static void main(String[] args) {
+        SpringApplication.run(RestConsumerApplication.class, args);
+    }
+
+    @RequestMapping("/get-greeting/{username}")
+    public String getGreeting(Model model, @PathVariable("username") String username) {
+        model.addAttribute("greeting", greetingService.getGreeting(username));
+        return "greeting-view";
+    }
+}

spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/src/main/resources/templates/greeting-view.html

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+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+    <head>
+        <title>Greetings from Hystrix</title>
+    </head>
+    <body>
+        <h2 th:text="${greeting}"/>
+    </body>
+</html>

spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>spring-cloud-hystrix-rest-producer</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>Spring Cloud Hystrix REST Producer</name>
+    <description>Spring Cloud Hystrix Sample REST Producer Implementation</description>
+
+    <parent>
+        <groupId>com.baeldung.spring.cloud</groupId>
+        <artifactId>spring-cloud-hystrix</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>..</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+            <version>1.4.0.RELEASE</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+            </plugin>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/producer/GreetingController.java

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+package com.baeldung.spring.cloud.hystrix.rest.producer;
+
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+public interface GreetingController {
+    @RequestMapping("/greeting/{username}")
+    String greeting(@PathVariable("username") String username);
+}

spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/producer/RestProducerApplication.java

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+package com.baeldung.spring.cloud.hystrix.rest.producer;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@SpringBootApplication
+@RestController
+public class RestProducerApplication implements GreetingController {
+    public static void main(String[] args) {
+        SpringApplication.run(RestProducerApplication.class, args);
+    }
+
+    @Override
+    public String greeting(@PathVariable("username") String username) {
+        return String.format("Hello %s!\n", username);
+    }
+}

spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/src/main/resources/application.properties

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+server.port=9090