Microservice Ribbon Load balancer Not working - load-balancing

Question

I try to create one service which consume multiple the same instance of another microservice service.
client microservice pom:
<?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.demotest</groupId>
<artifactId>demotest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>happpredictservice</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</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-feign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-ribbon</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>Dalston.RC1</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>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
</project>
//bootstrap.properties file:
spring.application.name=predict_service
spring.cloud.config.uri=http://localhost:8888 //this is my configuration //service path not related to my question here
registration_service.ribbon.eureka.enabled=false
registration_service.ribbon.listOfServers= localhost:8083,localhost:8084
registration_service.ribbon.ServerListRefreshInterval=15000
eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/
//application main class:
package com.demotest;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
#SpringBootApplication
#EnableDiscoveryClient
#EnableFeignClients
public class HapppredictserviceApplication {
public static void main(String[] args) {
SpringApplication.run(HapppredictserviceApplication.class, args);
}
}
//clinte service controller class:
package com.demotest.controllers;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.ribbon.RibbonClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import com.demotest.fiegns.Patient;
import com.demotest.fiegns.RegistrationServiceClient;
//registration_service is application to be called
#SpringBootApplication
#RestController
#RibbonClient(name="registration_service",configuration=Registration_Service_Ribbon_Config.class) //added for ribbon client
public class PredictController {
// it is feign client instantiation
#Autowired
RegistrationServiceClient regClient;
#LoadBalanced
#Bean
RestTemplate restTemplate(){
return new RestTemplate();
}
#Autowired
RestTemplate restTemplate;
#RequestMapping("/hi")
public String gussHi(){
final String serviceURL="http://registration_service";
String existingAge=restTemplate.getForObject(serviceURL+"/hi", String.class);
System.out.println("exisiting age:"+existingAge);
return existingAge;
}
}
//ribbon configuration:
package com.demotest.controllers;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import com.netflix.client.config.IClientConfig;
import com.netflix.loadbalancer.AvailabilityFilteringRule;
import com.netflix.loadbalancer.IPing;
import com.netflix.loadbalancer.IRule;
import com.netflix.loadbalancer.PingUrl;
public class Registration_Service_Ribbon_Config {
#Autowired
IClientConfig iClientConfig;
#Bean
public IPing ribbonPing(IClientConfig config){
return new PingUrl();
}
#Bean
public IRule ribbonRule(IClientConfig config){
return new AvailabilityFilteringRule();
}
}
//now I have other microservice to be consumed by the above client. its pom:
<?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.demotest</groupId>
<artifactId>demotest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>happregservice</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</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-gemfire</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</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>Dalston.RC1</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>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
</project>
//the bootstrap.properties file of microservice to be consumed:
spring.application.name=registration_service
spring.cloud.config.uri=http://localhost:8888
server.port=8083
//main class of the microservice to be consumed:
package com.demotest;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScans;
import org.springframework.data.gemfire.repository.config.EnableGemfireRepositories;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
#SpringBootApplication
#EnableDiscoveryClient
#EnableFeignClients
#EnableGemfireRepositories//this is for gemfire it works perfect not releted to //my question here
public class HappregserviceApplication {
public static void main(String[] args) {
SpringApplication.run(HappregserviceApplication.class, args);
}
}
//the controller class of the microservice to be consumed:
package com.demotest.controllers;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.UUID;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.demotest.entities.Patient;
import com.demotest.repositories.PatientRepo;
import com.netflix.discovery.DiscoveryClient;
#RestController
public class registrationcontroller {
#RequestMapping("/hi")
private String getHi(){
return "hi from original";
}
}
/*I copy and paste the same microservice(the second one) to be consumed and only I changed the port to 8084. for some reason I Iam getting error due to unable to access the service to be consumed by its name. When I try to access the service using localhost: it works. as soon as I chaged to the service name in the RsetTemplate call I am getting the following error:
java.lang.IllegalStateException: Request URI does not contain a valid hostname: http://registration_service/hi */

Answer 1

do not use "_" in "spring.application.name".you can change to "registration-service"