Microservices with Micronaut

Name: Microservices with Micronaut
Rating: 4.0 (65 reviews)

Micronaut is a modern, JVM-based, full stack Java framework designed for building modular, easily testable JVM apps

Created byAmit Bhave

Last updated 11/2022

English

What you'll learn

Micronaut
Developing microservices using Micronaut
Persistence using micronaut-data
Interservice communication

Course content

4 sections • 20 lectures • 1h 52m total length

Micronaut launch tool1:32
Enable Annotation Processing0:34
Enable annotations processing in Intellij.
Create Hello World endpoint1:32
Creating our /hello endpoint, that will return "Hello World!" as a response.
Complete code for this section can be found over Github.

Dependency Injection and Beans in Micronaut1:40
Dependency injection and beans in Micronaut.
Bean Qualifiers(@Named, @Qualifier)9:27
Ways of qualifying among multiple possible beans of same interface instance to be injected.
@Named and @Qualifier annotations(as per JSR-330 specs)
Complete source code can be found over Github.
Bean Priority1:57
Micronaut - Bean Priority Complete source code can be found over Github.
@Primary annotation prioritizes the bean in case of multiple possible implementations.
@Secondary annotation de-prioritizes the bean.
Further bean concepts5:12
In this video, we will take a look at further bean concepts like Bean Scopes, Bean Factories, Conditional Beans and Bean Replacements.
Read further in detail from the Micronaut official documentation.
Bean lifecycle methods4:59
In this video, we will take a look at Bean life cycle methods in Micronaut:
1)@PostContruct
2)@PreDestroy

HTTP Server Concepts5:45
Micronaut HTTP Server, HTTP Methods, Binding Annotations, HTTP Response.
User Service - POST and GET API14:01
User Service - HTTP POST, GET
Create User
Fetch Users
User Service - PUT and DELETE API7:36
User Service - HTTP PUT, DELETE
Update User
Delete User
Bean Validations3:56
User Service - Bean Validations
Error Handler6:22
Error handling in Micronaut (at Global level)
Micronaut Data10:28
Introduction to Micronaut Data.
Database Migrations with Flyway7:24
Database Migrations with Flyway.
Micronaut - Scheduled tasks3:44
Scheduled tasks in Micronaut. @Scheduled annotation.
Problems with Scheduled tasks2:32
Generally, we have multiple instances running of our service to handle scale, and we don't want all of our instances to run the scheduled task.
Shedlock for Scheduled Tasks7:40
In this video, we will see how to solve the problem of scheduled tasks in distributed environment, that we discussed in last lecture.

HTTPClient - Part-15:53
In this lecture, we will create a separate service "Preference service" to store user preferences. And in the next lecture, we will see about inter-service communication between our user-service and preference-service using Micronaut's declarative httpclient API.
HTTPClient - Part-210:11
In this video, we will see Micronaut's declarative httpclient, that enables us to call other external APIs from the micronaut app.

Requirements

Basic knowledge of Java
REST APIs

Description

Micronaut is a modern, JVM-based, full-stack Java framework designed for building modular, easily testable JVM apps. It currently supports Java, Kotlin, and Groovy.
It has the following benefits over other available frameworks like Spring boot:
1. Fast startup time - Thanks to Micronaut AOT. It reduces application startup time and deployment size by executing a number of operations during the build. It can precompute bean requirements and perform substitutions at build time, so that only classes that are going to be used in production are included.
2. Reduced memory footprint
3. Minimal use of reflection - It does the dependency injection at compile time, so it doesn't make the use of reflection for dependency injection at run time.
4. Minimal use of proxies
5. No runtime bytecode generation
6. Easy Unit Testing

In this course, you will learn the following topics:
1. Creating a hello world application with Micronaut.
2. Dependency Injection and Bean concepts in Micronaut - Bean qualifiers, Bean priority, Bean lifecycle methods.
3. REST APIs with Micronaut - GET, POST, PUT, DELETE.
4. Micronaut Data - a database access toolkit that uses Ahead of Time (AoT) compilation to pre-compute queries for repository interfaces that are then executed by a thin, lightweight runtime layer.
5. Error handling
6. Flyway integration with micronaut for easy database migrations(production ready).
7. Shedlock integration with Micronaut for running scheduled tasks in distributed environment.
8. Interservice communication using HTTPClient.

Who this course is for:

Developers building microservices with Java
Learning about micronaut

Microservices with Micronaut

What you'll learn

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Course content

Introduction3 lectures • 4min

Micronaut - Dependency Injection5 lectures • 23min