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Spring Cloud- Microservice Registration and Discovery using Netflix Eureka | JavaInUse



Spring Cloud- Microservice Registration and Discovery using Netflix Eureka

In this series we learn how to use Netflix Spring Cloud Components. In these posts we make use of Netflix component Eureka for service registry and discovery.

Spring Cloud - Table Of Contents

Microservice Registration and Discovery with Spring cloud using Netflix Eureka- Part 1. Microservice Registration and Discovery with Spring cloud using Netflix Eureka - Part 2. Microservice Registration and Discovery with Spring cloud using Netflix Eureka - Part 3. Microservice Registration and Discovery with Spring cloud using Netflix Eureka - Part 4. Spring Cloud- Netflix Eureka + Ribbon Simple Example Spring Cloud- Netflix Eureka + Ribbon + Hystrix Fallback Simple Example Spring Cloud- Netflix Hystrix Circuit Breaker Simple Example Spring Cloud- Netflix Feign REST Client Simple Example Spring Cloud- Netflix Zuul +Eureka Simple Example Spring Cloud Config Server using Native Mode Simple Example Spring Cloud Config Server Using Git Simple Example Spring Boot Admin Simple Example Spring Cloud Stream Tutorial - Publish Message to RabbitMQ Simple Example Spring Cloud Stream Tutorial - Consume Message from RabbitMQ Simple Example Spring Cloud Tutorial - Publish Events Using Spring Cloud Bus Spring Cloud Tutorial - Stream Processing Using Spring Cloud Data Flow Spring Cloud Tutorial - Distributed Log Tracing using Sleuth and Zipkin Example Spring Cloud Tutorial - Spring Cloud Gateway Hello World Example Spring Cloud Tutorial - Spring Cloud Gateway Filters Example Spring Cloud Tutorial - Spring Cloud Gateway + Netflix Eureka Example Spring Cloud Tutorial - Spring Cloud Gateway + Netflix Eureka + Netflix Hystrix Example
In previous post we registered the employee-producer to Eureka Service. This post we do service discovery using the employee-consumer module.

sprcloud_3-5

Video

This tutorial is explained in the below Youtube Video.


Lets Begin-

  • Develop the Eureka server Service as follows-

    The maven project we will be creating is as follows-

    sprcloud_3-2
    The pom.xml with spring cloud dependencies is as follows-
    <?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	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.javainuse</groupId>
    	<artifactId>eureka-server</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>jar</packaging>
    
    	<name>eureka-server</name>
    	<description>Demo project for Spring Boot</description>
    
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>1.5.2.RELEASE</version>
    		<relativePath/> <!-- lookup parent from repository -->
    	</parent>
    
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    		<java.version>1.8</java.version>
    	</properties>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.cloud</groupId>
    			<artifactId>spring-cloud-starter-eureka-server</artifactId>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    	</dependencies>
    
    	<dependencyManagement>
    		<dependencies>
    			<dependency>
    				<groupId>org.springframework.cloud</groupId>
    				<artifactId>spring-cloud-dependencies</artifactId>
    				<version>Camden.SR6</version>
    				<type>pom</type>
    				<scope>import</scope>
    			</dependency>
    		</dependencies>
    	</dependencyManagement>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    			</plugin>
    		</plugins>
    	</build>
    
    
    </project>
    

Define the Spring Boot class with annotations @SpringBootApplication and @EnableEurekaServer.
package com.javainuse;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {

	public static void main(String[] args) {
		SpringApplication.run(EurekaServerApplication.class, args);
	}
}

Finally specify the port on which the eureka application will get started -
Next define the batch configuration for creating the tasklet as follows-
server.port=8090

Run this as java application. Go to URL-
http://localhost:8090/
We can see the Eureka Server page as follows-

sprcloud_3-3
  • Next we modify the employee-producer module we defined previously to register to the Eureka server.

    Add the Spring cloud dependencies to the pom.xml as follows-

    <?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	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.javainuse</groupId>
    	<artifactId>employee-producer</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>jar</packaging>
    
    	<name>SpringBootHelloWorld</name>
    	<description>Demo project for Spring Boot</description>
    
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>1.4.1.RELEASE</version>
    		<relativePath /> <!-- lookup parent from repository -->
    	</parent>
    
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    		<java.version>1.8</java.version>
    	</properties>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework.cloud</groupId>
    			<artifactId>spring-cloud-starter-eureka</artifactId>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    
    	</dependencies>
    
    	<dependencyManagement>
    		<dependencies>
    			<dependency>
    				<groupId>org.springframework.cloud</groupId>
    				<artifactId>spring-cloud-dependencies</artifactId>
    				<version>Camden.SR6</version>
    				<type>pom</type>
    				<scope>import</scope>
    			</dependency>
    		</dependencies>
    	</dependencyManagement>
    
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    			</plugin>
    		</plugins>
    	</build>
    
    </project>
    

    Next define the Spring Boot class with annotations @SpringBootApplication and @EnableDiscoveryClient.
    package com.javainuse;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    
    @SpringBootApplication
    @EnableDiscoveryClient
    public class SpringBootHelloWorldApplication {
    
    	public static void main(String[] args) {
    		SpringApplication.run(SpringBootHelloWorldApplication.class, args);
    	}
    }
    

    In the application.properties specify the url on which the Eureka server is up and running.
    eureka.client.serviceUrl.defaultZone=http://localhost:8090/eureka
    

    Now start this employee-producer by running this as a Java Application and go to url.
    http://localhost:8090/
    We can see the Eureka Server page with the employee-producer module registered as follows-

    sprcloud_3-4
    We can see here that the registered application name is coming as UNKNOWN. To change this create in resources a file named bootstrap.properties
    spring.application.name=employee-producer
    

    We can now see the sevice registered as-

    sprcloud_3-6
  • Download Source Code

    Download it -
    Employee Producer Service with Eureka Registration
    Eureka Server Service

    See Also

    Spring Boot Hello World Application- Create simple controller and jsp view using Maven Spring Boot Tutorial-Spring Data JPA Spring Boot + Simple Security Configuration Pagination using Spring Boot Simple Example Spring Boot + ActiveMQ Hello world Example Spring Boot + Swagger Example Hello World Example Spring Boot + Swagger- Understanding the various Swagger Annotations Spring Boot Main Menu Spring Boot Interview Questions