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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
Spring Cloud Tutorial - Secure Secrets using Spring Cloud Config + Vault 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

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