amartya-dev/spring_microservices_sample

Java Microservices with spring boot and spring cloud

This example is a very basic implementation of microservices architecture built with Spring Boot, Spring Cloud, Eureka Server.

The repository consists of three services:

1. The Eureka Server (aka discovery-service) that scans for the attached clients (the other microservices) that can easily communicate with one another.
2. The queue-service with JPA, H2 for database persistence, that uses Cipher for decrypting the transaction data we receive from api-gateway and
3. The api-gateway which is responsible for the main interaction, i.e. it will be used to encrypt and send transactions data / retrieve the decrypted data from the queue-service.

Running the project

The project basically consists of three different micro services which are individual spring boot projects which depend on each other (linked using eureka).

1. Create a security key using AES algorithm and save it to a file called security.key, the same file needs to exist in queue-service and api-gateway. The contents of the file have to be string.

   import java.io.FileWriter;
   import java.util.Base64;
   import javax.crypto.KeyGenerator;   
   import javax.crypto.SecretKey;
   
   public class SomeClass {
       public static void main (String[] args) {
           KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
           keyGenerator.init(128); // block size is 128bits
           SecretKey secretKey = keyGenerator.generateKey();
           byte[] encoded = secretKey.getEncoded();
           String output = Base64.getEncoder().withoutPadding().encodeToString(encoded);
           FileWriter fw = new FileWriter("security.key");
           fw.append(output);
           fw.flush();
           fw.close();
       }
   }

2. Go to each folder and run mvn spring-boot:run