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Spring Boot Microservices

Spring Boot Microservices

Definition of Spring Boot Microservices

In Spring boot-microservices, as the name suggests it is the group of micro or small services altogether. By the use of microservices we can distribute the large application into the smaller process, it works at the process level, but our spring boot work at the component level. By the use of it, we can make the spring boot application or the service loosely coupled process. To make this enable into our project we have to make the required configurations else it will not work as expected. We have so many benefits of using microservices like they are very independent, have their own database, can be written in any programming language irrespective of the core application. In the coming section of the tutorial, we will see its internal working and the full configuration to make the normal spring boot to microservices for beginners.

Syntax:

As we know it is making our application an independent service, so we have to make some changes to the configuration, then we can continue writing the code as per the requirement. Let’s take a closer look at the syntax to see below;

@EnableEurekaServer

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We are using the spring eureka server in the syntax we have to add the dependency and annotate the main class with this annotation. Let’s take a practice look at the syntax to understand it better see below;

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e.g. :

@SpringBootApplication
@EnableEurekaServer
public class TradersApplication {
//
}

As you can see in the above piece of syntax we have used this annotation in the mainspring boot class to enable the configuration for microservice. In the coming section of the tutorial, we will see its internal working and also the practice code using the eureka server with spring boot for beginners to get a better understanding.

How do Spring boot-microservices works?

As of now we already know that microservices is an architecture that allows us to create and build the application into a smaller piece of services. Also, it makes our project a loosely coupled process, it has many benefits like it is very independent of its core application, and if in the future any other third party uses our service to consume data they can easily use this without making any changes to it. In this section, we will see one practice example of how we can make this happen and start using it. Let’s get started.

1) Suppose we have one shopping web application that has different modules like order server, cart server, account server, and item server. without microservices, we have a monolithic architecture where all the functions are build up into one single project. That means if one part of the application break which will stop the whole application to access but this is not the scenario in the case of microservices architecture we have sorted services for all these which will be independent of each other and run independently without interfering with other application.

2) So in this we will see how we can make the service as microservices using this example see below;

3) First we have to make the spring boot project from scratch, also for this we can use the spring initializer to do so. follow the below link and make the required application.

URL: https://start.spring.io/

Spring boot 1

4) Now we have to add the required dependency to our project like below; Add this into the build file you have,

e.g.:

org.springframework.cloud
spring-cloud-starter-netflix-eureka-server

5) After this we have to make the main spring boot application with this annotation but remember we have to have the required dependency into place in order to treat our service as microservices see below;

code for main class:

import com. test.Traders. entity.Student;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;
import java.util.*;
@SpringBootApplication
@EnableEurekaServer
public class TradersApplication {
public static void main(String[] args)
{
SpringApplication.run(TradersApplication.class, args);
System.out.println(" ");
}
}

As you can see in the above piece of code w have added the @EnableEurekaServer dependency to the main class which will enable the eureka-server for us in spring boot. Mentioned the below configuration into the application file, this is necessary;

code for application. properties :

eureka.client.register-with-eureka=false

6) Now we have to make one more project from the spring initializer and named it as Item service this will be the independent service for the core application which will be responsible to handle the item-related things for the service.

7) now give a name to service item into the application property file like below;
code for item application property file :

spring. application.name=item-service

8) Always remember the port for other the property should be different otherwise it won’t run and will create a problem for us.

9) After making all the change we can start running both the application together, and monitor the logs for each of them if they are running fine after running you will see the below logs on the console of the spring boot application see below;

Output:

Spring boot 2

These should be the outputs for both the app.

Points to remember while running the application and using it;

1) Microservices is an independent architecture.

2) It allows us to distribute the application, also we can make the small modules for a different part of the application.

3) but it has a disadvantage also because as we make the different services in the application we have to maintain and monitor each of the services. If the service is not working it will impact the respective service and others who are consuming data from it.

4) We can divide our application, and create different instances for each of them.

Conclusion

As we have seen it is very useful for us to treat our application as an independent module with all the code is separate, we can reuse the microservices at other places if required. There is dependency, it makes the development process very fast, and easy to handle by the developers also. If we skip any of the configurations in the application, then the application will not work and throw exceptions for us.

Recommended Articles

This is a guide to Spring Boot Microservices. Here we discuss definition, syntax, and parameters, How Spring boot microservices work? examples with code implementation. You may also have a look at the following articles to learn more –

  1. Spring AOP
  2. Spring Boot DevTools
  3. Spring Boot Actuator
  4. Spring Boot Starter Web
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