Gain insights into Quarkus, a modern Java framework. Learn about creating and configuring applications, REST endpoints, WebSockets, GraphQL, fault tolerance, and database connections for robust microservices.

quarkus.tar.gz

Quarkus run dev application

Quarkus test application

Quarkus run dev application + MongoDB

Quarkus run dev application + PostgreSQL

Quarkus is a modern Java framework that simplifies the creation of web applications. With the help of Quarkus, you can create modern applications and deploy them easily on the cloud.

You’ll begin the course with an introduction to Quarkus and the different features that make it a great Java framework. Next, you’ll explore the basics of Quarkus, such as creating and configuring an application, adding plugins, and testing your code. You’ll learn how to build modern web applications using Quarkus by creating and consuming REST endpoints and documenting them. You’ll also learn how to create a WebSocket server and a GraphQL endpoint and ensure fault tolerance for your application. Lastly,  you’ll add different kinds of database connections to your Quarkus application.

After completing this course, you’ll be equipped to create various applications and microservices using Quarkus, a must-have knowledge for any developer.

Developing Microservices with Quarkus

**Hibernate Reactive** is the reactive API for the Hibernate ORM. It adds support for non-blocking database drivers to enable a reactive style of interaction with the database.

# Adding the extensions

To use the Hibernate Reactive extension, we need to add a couple of dependencies, the first being the extension itself, called `quarkus-hibernate-reactive`. The second dependency is the reactive JDBC driver for the chosen database. Quarkus offers a list of extensions to handle different types of databases, which include:

* `quarkus-reactive-mysql-client` used for MySQL.
* `quarkus-reactive-oracle-client` used for Oracle Database.
* `quarkus-reactive-pg-client` used for PostgreSQL.

> **Note:** In the rest of the course, we’ll use PostgreSQL as the reactive SQL database.

After adding the dependencies, we should have the below new lines in our `pom.xml` (or `build.gradle`) file.

// Hibernate Reactive dependency
implementation("io.quarkus:quarkus-hibernate-reactive")

Reactive SQL client for PostgreSQL
implementation("io.quarkus:quarkus-reactive-pg-client")

<dependency>
    <groupId>io.quarkus</groupId>
    <artifactId>quarkus-hibernate-reactive</artifactId>
</dependency>


<dependency>
    <groupId>io.quarkus</groupId>
    <artifactId>quarkus-reactive-pg-client</artifactId>
</dependency>

# Using Hibernate Reactive

Using the Reactive Hibernate API is no different. We still need to create our entities and services to access the data.

In the code below, we define the to-do example by using the reactive API:

Learn how to use a SQL database with Quarkus and Hibernate Reactive.


Hibernate Reactive

Learn how to use a SQL database with Quarkus and Hibernate Reactive.

Introduction to Quarkus

Quarkus Basics

Quarkus Web

Quarkus Data

Epilogue

Appendix

Hibernate Reactive

Adding the extensions

Using Hibernate Reactive