Micronaut Tutorial: Security

This is the third part of my tutorial to Micronaut Framework. This time we will discuss the most interesting Micronaut security features. I have already described core mechanisms for IoC and dependency injection in the first part of my tutorial, and I have also created a guide to building simple REST server-side application in the second part. For more details you may refer to:

• Part 1: Micronaut Tutorial: Beans and Scopes
• Part 2: Micronaut Tutorial: Server Application

Micronaut Tutorial: Server Application

In this part of my tutorial to Micronaut framework we are going to create simple HTTP server-side application running on Netty. We have already discussed the most interesting core features of Micronaut like beans, scopes or unit testing in the first part of that tutorial. For more details you may refer to my article Micronaut Tutorial: Beans and Scopes.

Assuming we have a basic knowledge about core mechanisms of Micronaut we may proceed to the key part of that framework and discuss how to build simple microservice application exposing REST API over HTTP.

Micronaut Tutorial: Beans and Scopes

Micronaut is a relatively new JVM-based framework. It is especially designed for building modular, easy testable microservice applications. Micronaut is heavily inspired by Spring and Grails frameworks, which is not a surprise, if we consider it has been developed by the creators of Grails framework. It is based on Java’s annotation processing, IoC (Inversion of Control) and DI (Dependency Injection).

Micronaut implements the JSR-330 (java.inject) specification for dependency injection. It supports constructor injection, field injection, JavaBean and method parameter injection. In this part of tutorial I’m going to give some tips on how to:

• define and register beans in the application context
• use built-in scopes
• inject configuration to your application
• automatically test your beans during application build with JUnit 5

Performance Comparison Between Spring Boot and Micronaut

Today we will compare two frameworks used for building microservices on the JVM: Spring Boot and Micronaut. First of them, Spring Boot is currently the most popular and opinionated framework in the JVM world. On the other side of the barrier is staying Micronaut, quickly gaining popularity framework especially designed for building serverless functions or low memory-footprint microservices. We will be comparing version 2.1.4 of Spring Boot with 1.0.0.RC1 of Micronaut. The comparison criteria are:

• memory usage (heap and non-heap)
• the size in MB of generated fat JAR file
• the application startup time
• the performance of application, in the meaning of average response time from the REST endpoint during sample load testing

The Future of Spring Cloud Microservices After Netflix Era

If somebody would ask you about Spring Cloud, the first thing that comes into your mind will probably be Netflix OSS support. Support for such tools like Eureka, Zuul or Ribbon is provided not only by Spring, but also by some other popular frameworks used for building microservices architecture like Apache Camel, Vert.x or Micronaut. Currently, Spring Cloud Netflix is the most popular project being a part of Spring Cloud. It has around 3.2k stars on GitHub, while the second best has around 1.4k. Therefore, it is quite surprising that Pivotal has announced that most of Spring Cloud Netflix modules are entering maintenance mode. You can read more about in the post published on the Spring blog by Spencer Gibb https://spring.io/blog/2018/12/12/spring-cloud-greenwich-rc1-available-now.