We would build microservices that represents a school system. I would have four services:<\/p>\n
- \n
- Teachers service<\/li>\n
- Students service<\/li>\n
- Courses service<\/li>\n
- Departments service<\/li>\n<\/ul>\n
The architecture for the system we are building is given below:<\/p>\n
![\"Microservices](\"https:\/\/www.kindsonthegenius.com\/microservices\/wp-content\/uploads\/sites\/18\/2019\/11\/Microservices-With-Spring-Profiles.jpg\")
<\/a>Microservices With Spring Profiles<\/figcaption><\/figure>\n Follow the Steps Below<\/strong><\/p>\n
For these steps, the actual details are provided in the Video here.<\/p>\n
Step 1:<\/strong> Setup and start the Eureka Server<\/p>\n
You simply create a spring boot starter project and add the Eureka Server dependency.<\/p>\n
For some reason, I don’t see spring-boot-starter web dependency. In that case, you need to add the dependency to the pom.xml file.<\/p>\n
<dependency><\/span>\r\n <groupId><\/span>org.springframework.boot<\/groupId><\/span>\r\n <artifactId><\/span>spring-boot-starter-web<\/artifactId><\/span>\r\n<\/dependency><\/span>\r\n<\/pre>\n<\/p>\n
Also add the following to the application.properties file<\/p>\n
server.port=8761\r\neureka.client.register-with-eureka=false\r\neureka.client.fetch-registry=false\r\n<\/pre>\n
These lines tell the server not to search for other servers (we just have one server). It also tell the server to run on port 8761 instead of default port 8080.<\/p>\n
Also remember to add the @EnableEurekaServer annotation to the main application class.<\/p>\n
<\/p>\n
Step 2<\/strong>: Build a Eureka Client monolith application<\/p>\n
Create a spring boot starter project and add the Eureka Client dependency. Also add the spring-boot-starter-web dependency to to pom.xml.<\/p>\n
You can fire up the Eureka Server and visit http:\/\/localhost:8761<\/a> to make sure it’s up and running. The window is as shown below<\/p>\n
![\"\"](\"https:\/\/www.kindsonthegenius.com\/microservices\/wp-content\/uploads\/sites\/18\/2019\/11\/Eureka-Server-Window-2-1024x735.jpg\")
<\/a><\/p>\nNote<\/strong><\/span>: In your case, you’ll not see any services under the Application column. That would appear later.<\/p>\n
<\/p>\n
Step 3<\/strong>: Create the four packages<\/p>\n
Create the following four packages: students, courses, teachers and departments<\/p>\n
<\/p>\n
Step 4<\/strong>: Add the controller class<\/p>\n
For each of the package, add the controller class with the following content:
\n<\/p>\n@GetMapping<\/span>(<\/span>\"\/students\"<\/span>)<\/span>\r\npublic<\/span> String Home<\/span>()<\/span> {<\/span>\r\n\treturn<\/span> \"Welcome to Students Services\"<\/span>;<\/span>\r\n}<\/span>\r\n<\/pre>\nDo the same for all the other packages\/controllers.<\/p>\n
<\/p>\n
Step 5:<\/strong> Add the @EnableEurekaClient annotation to the the main application class<\/p>\n
<\/p>\n
Step 6:<\/strong> Add the @Profile annotation to all the Controller classes. For example, in the student controller, just below the @RestController annotation, add the annotation<\/p>\n
@Profile<\/span>(<\/span>\"students\"<\/span>)<\/span>\r\n<\/pre>\nRepeat the same for the other services changing the name of the profile accordingly.<\/p>\n
<\/p>\n
Step 7<\/strong>: Set the server.port=0 in the application.properties file.<\/p>\n
This setting tells spring boot to automatically assign a port (not the default 8080 port) to any of the service that starts up.<\/p>\n
<\/p>\n
Step 8:<\/strong> Set the application name in the application.properties file<\/p>\n
We need to set the application name to correspond to the profile name. So at startup, the active profile name is used to generated the application name. In this way, we ensure the four profiles run as four different application.<\/p>\n
To do this, add the following code to the\u00a0 application.properties file<\/p>\n
spring.<\/span>application<\/span>.<\/span>name<\/span> =<\/span> ${<\/span>spring.profiles.<\/span>active<\/span>}<\/span>\r\n<\/pre>\n<\/p>\n
Step 9:<\/strong> Set up the run configuration.<\/p>\n
This is a very important part. To do that, click on run in the menu and select ‘Run Configuration’. The Run Configurations window opens up as shown below:<\/p>\n
![\"Spring](\"https:\/\/www.kindsonthegenius.com\/microservices\/wp-content\/uploads\/sites\/18\/2019\/11\/Spring-Boot-Run-Configuration-Window-1.jpg\")
<\/a>Spring Boot Run Configuration Window<\/figcaption><\/figure>\n Step 10:<\/strong> Select Spring Boot App in the list and click on the Launch New Configuration button (circled in red)<\/p>\n
Step 11<\/strong>: Give the configuration a name and click on Apply. In this case students-config<\/p>\n
Step 12<\/strong>: Set the spring boot run configuration as shown in the figure below:<\/p>\n