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Spring Cloud - Creating Eureaka Client

Quiz

In this chapter, you are going to learn in detail about how to register the Spring Boot Micro service application into the Eureka Server. Before registering the application, please make sure Eureka Server is running on the port 8761 or first build the Eureka Server and run it. For further information on building the Eureka server, you can refer to the previous chapter Spring Cloud - Creating Eureka Server

Example - Building a Eureka Client

Eureka Client comes with the bundle of Spring Cloud. For this, we need to develop the Eureka client and run it on the default port 8080.

Visit the Spring Initializer homepage https://start.spring.io/ and download the Spring Boot project with Eureka Client dependency. It is shown in the screenshot below −

After downloading the project in main Spring Boot Application class file, we need to add @EnableEurekaClient annotation. The @EnableEurekaClient annotation is used to make your Spring Boot application acts as a Eureka Client.

EurekaclientApplication.java

The code for main Spring Boot application class file is as shown below −

package com.tutorialspoint.eurekaclient;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class EurekaclientApplication {
   public static void main(String[] args) {
      SpringApplication.run(EurekaclientApplication.class, args);
   }
}

Make sure Spring cloud Eureka client dependency is added in your build configuration file.

The code for Maven user dependency is shown below −

<dependency>
<groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>

The code for Gradle user dependency is given below −

compile('org.springframework.cloud:spring-cloud-starter-netflix-eureka-client')

The complete build configuration file is given below −

Maven - pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>3.5.6</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.tutorialspoint</groupId>
   <artifactId>eurekaserver</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>eurekaserver</name>
   <description>Demo project for Spring Boot</description>
   <url/>
   <licenses>
      <license/>
   </licenses>
   <developers>
      <developer/>
   </developers>
   <scm>
      <connection/>
      <developerConnection/>
      <tag/>
      <url/>
   </scm>
   <properties>
      <java.version>21</java.version>
      <spring-cloud.version>2025.0.0</spring-cloud.version>
   </properties>
   <dependencies>
      <dependency>
         <groupId>org.springframework.cloud</groupId>
         <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
         <scope>test</scope>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-web</artifactId>
      </dependency>
   </dependencies>
   <dependencyManagement>
      <dependencies>
         <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>${spring-cloud.version}</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>

Gradle - build.gradle

buildscript {
   ext {
      springBootVersion = '3.5.6'
   }
   repositories {
      mavenCentral()
   }
   dependencies {
      classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
   }
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 21

repositories {
   mavenCentral()
}
ext {
   springCloudVersion = '2025.0.0'
}
dependencies {
   compile('org.springframework.cloud:spring-cloud-starter-eureka-client')
   testCompile('org.springframework.boot:spring-boot-starter-test')
}
dependencyManagement {
   imports {
      mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
   }
}

To register the Spring Boot application into Eureka Server we need to add the following configuration in our application.properties file or application.yml file and specify the Eureka Server URL in our configuration.

application.yml

The code for application.yml file is given below −

eureka:
   client:
      serviceUrl:
         defaultZone: http://localhost:8761/eureka
      instance:
      preferIpAddress: true
spring:
   application:
      name: eurekaclient

application.properties

The code for application.properties file is given below −

eureka.client.serviceUrl.defaultZone  = http://localhost:8761/eureka
eureka.client.instance.preferIpAddress = true
spring.application.name = eurekaclient

Now, add the Rest Endpoint to return String in the main Spring Boot application and the Spring Boot Starter web dependency in build configuration file. Observe the code given below −

EurekaclientApplication.java

package com.tutorialspoint.eurekaclient;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@EnableDiscoveryClient
@RestController
public class EurekaclientApplication {

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

   @GetMapping(value = "/")
   public String home() {
      return "Eureka Client application";
   }
}

Output

You can create an executable JAR file, and run the Spring Boot application by using the following Maven or Gradle commands −

For Maven, you can use the following command −

mvn clean install

After "BUILD SUCCESS", you can find the JAR file under the target directory.

For Gradle, you can use the following command −

gradle clean build

After "BUILD SUCCESSFUL", you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the command as shown −

java jar <JARFILE>

Now, the application has started on the Tomcat port 8080 and Eureka Client application is registered with the Eureka Server as shown below −


  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/

 :: Spring Boot ::                (v3.5.6)

2025-10-07T14:30:11.544+05:30  INFO 46404 --- [eurekaserver] [           main] c.t.e.EurekaserverApplication            : Starting EurekaserverApplication using Java 21.0.6 with PID 46404 (D:\Projects\eurekaserver\target\classes started by mahes in D:\Projects\eurekaserver)
2025-10-07T14:30:11.546+05:30  INFO 46404 --- [eurekaserver] [           main] c.t.e.EurekaserverApplication            : No active profile set, falling back to 1 default profile: "default"
2025-10-07T14:30:12.957+05:30  INFO 46404 --- [eurekaserver] [           main] o.s.cloud.context.scope.GenericScope     : BeanFactory id=37b0aecd-4feb-3fa0-b028-b62a23271b1d
2025-10-07T14:30:13.383+05:30  INFO 46404 --- [eurekaserver] [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port 8761 (http)
2025-10-07T14:30:13.399+05:30  INFO 46404 --- [eurekaserver] [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2025-10-07T14:30:13.399+05:30  INFO 46404 --- [eurekaserver] [           main] o.apache.catalina.core.StandardEngine    : Starting Servlet engine: [Apache Tomcat/10.1.46]
2025-10-07T14:30:13.459+05:30  INFO 46404 --- [eurekaserver] [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2025-10-07T14:30:13.459+05:30  INFO 46404 --- [eurekaserver] [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1789 ms
2025-10-07T14:30:14.623+05:30  INFO 46404 --- [eurekaserver] [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON encoding codec LegacyJacksonJson
2025-10-07T14:30:14.624+05:30  INFO 46404 --- [eurekaserver] [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON decoding codec LegacyJacksonJson
2025-10-07T14:30:14.878+05:30  INFO 46404 --- [eurekaserver] [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using XML encoding codec XStreamXml
2025-10-07T14:30:14.878+05:30  INFO 46404 --- [eurekaserver] [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using XML decoding codec XStreamXml
2025-10-07T14:30:15.173+05:30  INFO 46404 --- [eurekaserver] [           main] o.s.v.b.OptionalValidatorFactoryBean     : Failed to set up a Bean Validation provider: jakarta.validation.NoProviderFoundException: Unable to create a Configuration, because no Jakarta Bean Validation provider could be found. Add a provider like Hibernate Validator (RI) to your classpath.
2025-10-07T14:30:15.985+05:30  WARN 46404 --- [eurekaserver] [           main] iguration$LoadBalancerCaffeineWarnLogger : Spring Cloud LoadBalancer is currently working with the default cache. While this cache implementation is useful for development and tests, it's recommended to use Caffeine cache in production.You can switch to using Caffeine cache, by adding it and org.springframework.cache.caffeine.CaffeineCacheManager to the classpath.
2025-10-07T14:30:16.010+05:30  INFO 46404 --- [eurekaserver] [           main] o.s.c.n.eureka.InstanceInfoFactory       : Setting initial instance status as: STARTING
2025-10-07T14:30:16.064+05:30  INFO 46404 --- [eurekaserver] [           main] com.netflix.discovery.DiscoveryClient    : Initializing Eureka in region us-east-1
2025-10-07T14:30:16.064+05:30  INFO 46404 --- [eurekaserver] [           main] com.netflix.discovery.DiscoveryClient    : Client configured to neither register nor query for data.
2025-10-07T14:30:16.069+05:30  INFO 46404 --- [eurekaserver] [           main] com.netflix.discovery.DiscoveryClient    : Discovery Client initialized at timestamp 1759827616067 with initial instances count: 0
2025-10-07T14:30:16.154+05:30  INFO 46404 --- [eurekaserver] [           main] c.n.eureka.DefaultEurekaServerContext    : Initializing ...
2025-10-07T14:30:16.156+05:30  INFO 46404 --- [eurekaserver] [           main] c.n.eureka.cluster.PeerEurekaNodes       : Adding new peer nodes [http://localhost:8761/eureka/]
2025-10-07T14:30:16.379+05:30  INFO 46404 --- [eurekaserver] [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON encoding codec LegacyJacksonJson
2025-10-07T14:30:16.379+05:30  INFO 46404 --- [eurekaserver] [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON decoding codec LegacyJacksonJson
2025-10-07T14:30:16.379+05:30  INFO 46404 --- [eurekaserver] [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using XML encoding codec XStreamXml
2025-10-07T14:30:16.379+05:30  INFO 46404 --- [eurekaserver] [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using XML decoding codec XStreamXml
2025-10-07T14:30:16.424+05:30  INFO 46404 --- [eurekaserver] [           main] c.n.eureka.cluster.PeerEurekaNodes       : Replica node URL:  http://localhost:8761/eureka/
2025-10-07T14:30:16.435+05:30  INFO 46404 --- [eurekaserver] [           main] c.n.e.registry.AbstractInstanceRegistry  : Finished initializing remote region registries. All known remote regions: []
2025-10-07T14:30:16.436+05:30  INFO 46404 --- [eurekaserver] [           main] c.n.eureka.DefaultEurekaServerContext    : Initialized
2025-10-07T14:30:16.453+05:30  INFO 46404 --- [eurekaserver] [           main] o.s.b.a.e.web.EndpointLinksResolver      : Exposing 1 endpoint beneath base path '/actuator'
2025-10-07T14:30:16.536+05:30  INFO 46404 --- [eurekaserver] [           main] o.s.c.n.e.s.EurekaServiceRegistry        : Registering application EUREKASERVER with eureka with status UP
2025-10-07T14:30:16.550+05:30  INFO 46404 --- [eurekaserver] [       Thread-9] o.s.c.n.e.server.EurekaServerBootstrap   : isAws returned false
2025-10-07T14:30:16.550+05:30  INFO 46404 --- [eurekaserver] [       Thread-9] o.s.c.n.e.server.EurekaServerBootstrap   : Initialized server context
2025-10-07T14:30:16.550+05:30  INFO 46404 --- [eurekaserver] [       Thread-9] c.n.e.r.PeerAwareInstanceRegistryImpl    : Got 1 instances from neighboring DS node
2025-10-07T14:30:16.550+05:30  INFO 46404 --- [eurekaserver] [       Thread-9] c.n.e.r.PeerAwareInstanceRegistryImpl    : Renew threshold is: 1
2025-10-07T14:30:16.550+05:30  INFO 46404 --- [eurekaserver] [       Thread-9] c.n.e.r.PeerAwareInstanceRegistryImpl    : Changing status to UP
2025-10-07T14:30:16.553+05:30  INFO 46404 --- [eurekaserver] [       Thread-9] e.s.EurekaServerInitializerConfiguration : Started Eureka Server
2025-10-07T14:30:16.576+05:30  INFO 46404 --- [eurekaserver] [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port 8761 (http) with context path '/'
2025-10-07T14:30:16.578+05:30  INFO 46404 --- [eurekaserver] [           main] .s.c.n.e.s.EurekaAutoServiceRegistration : Updating port to 8761
2025-10-07T14:30:16.604+05:30  INFO 46404 --- [eurekaserver] [           main] c.t.e.EurekaserverApplication            : Started EurekaserverApplication in 5.669 seconds (process running for 6.405)
2025-10-07T14:30:57.836+05:30  INFO 46404 --- [eurekaserver] [nio-8761-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2025-10-07T14:30:57.836+05:30  INFO 46404 --- [eurekaserver] [nio-8761-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2025-10-07T14:30:57.842+05:30  INFO 46404 --- [eurekaserver] [nio-8761-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 6 ms
2025-10-07T14:31:16.552+05:30  INFO 46404 --- [eurekaserver] [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 0ms
2025-10-07T14:32:16.553+05:30  INFO 46404 --- [eurekaserver] [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 13ms
2025-10-07T14:33:16.553+05:30  INFO 46404 --- [eurekaserver] [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 9ms
2025-10-07T14:34:16.560+05:30  INFO 46404 --- [eurekaserver] [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 15ms
2025-10-07T14:35:16.560+05:30  INFO 46404 --- [eurekaserver] [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 9ms
2025-10-07T14:36:16.561+05:30  INFO 46404 --- [eurekaserver] [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 9ms
2025-10-07T14:37:16.562+05:30  INFO 46404 --- [eurekaserver] [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 9ms
2025-10-07T14:38:16.564+05:30  INFO 46404 --- [eurekaserver] [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 11ms
2025-10-07T14:39:16.564+05:30  INFO 46404 --- [eurekaserver] [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 8ms
2025-10-07T14:40:16.565+05:30  INFO 46404 --- [eurekaserver] [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 9ms
2025-10-07T14:41:16.567+05:30  INFO 46404 --- [eurekaserver] [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 11ms
2025-10-07T14:42:16.573+05:30  INFO 46404 --- [eurekaserver] [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 14ms
2025-10-07T14:43:16.578+05:30  INFO 46404 --- [eurekaserver] [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 14ms
2025-10-07T14:43:22.871+05:30  INFO 46404 --- [eurekaserver] [io-8761-exec-10] c.n.e.registry.AbstractInstanceRegistry  : Registered instance EUREKACLIENT/Home:eurekaclient with status UP (replication=false)
2025-10-07T14:43:23.509+05:30  INFO 46404 --- [eurekaserver] [nio-8761-exec-1] c.n.e.registry.AbstractInstanceRegistry  : Registered instance EUREKACLIENT/Home:eurekaclient with status UP (replication=true)

Hit the URL http://localhost:8761/ in your web browser and you can see the Eureka Client application is registered with Eureka Server.

Now hit the URL http://localhost:8080/ in your web browser and see the Rest Endpoint output.

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