ABuarque / SpringCloudWithZuulAndEureka

Using Spring Cloud to create Microservices

SpringCloudWithZuulAndEureka

Using Eureka Discovery service and Zuul as proxy

Eureka

To enable service discovery, in your microservices add the following dependencia:

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

And then, add the anotion to driver class:

@EnableEurekaClient

Configure the application.yml file:

spring:
  application:
    name: api-client

server:
  port: 8501

eureka:
  client:
    registerWithEureka: true
    fetchRegistry: true
    serviceUrl:
      defaultZone: http://localhost:8502/eureka/
  instance:
    hostname: localhost

In the Discovery microservice add the following dependency:

implementation('org.springframework.cloud:spring-cloud-starter-netflix-eureka-server')

Enable Eureka server in driver class:

@EnableEurekaServer

Configure the application.yml:

eureka:
  dashboard:
    enabled: true
  client:
    registerWithEureka: false
    fetchRegistry: false
    server:
      waitTimeInMsWhenSyncEmpty: 0

To open up the Eureka dashboard

http://localhost:8502/

Zuul

Add the following dependencie to the gateway microservice:

implementation('org.springframework.cloud:spring-cloud-starter-netflix-zuul')

Add the Enable zuul proxy anotation to driver class:

@EnableZuulProxy

Configure the application.yml:

zuul:
  #Service will be mapped under the /api URI
  prefix: /api
  routes:
    api-server:
      stripPrefix: false
      path: /users/**
      url: http://localhost:8500
    api-client:
      stripPrefix: false
      path: /analysis/**
      url: http://localhost:8501

Fixing problems with JAXB

About: http://blog.caelum.com.br/erros-com-jaxb-no-java-9/

To fix it, add these dependecies to the build.gradle in your gateway project

compile group: 'javax.xml.bind', name: 'jaxb-api', version: '2.2.4'
compile group: 'com.sun.xml.bind', name: 'jaxb-core', version: '2.2.7'
compile group: 'com.sun.xml.bind', name: 'jaxb-impl', version: '2.2.3-1'