WildFly 21: The Best Choice for Legacy JBoss Microcontainer and SAR Applications
How to Download and Install WildFly 21
If you are looking for a fast, lightweight, and powerful application server for your Java web applications, you might want to consider WildFly 21. WildFly 21 is the latest release in a series of open-source application server offerings from JBoss, now part of Red Hat. In this article, we will show you how to download and install WildFly 21 on your system, and how to verify the installation.
What is WildFly 21?
WildFly 21 is an exceptionally fast, lightweight, and powerful implementation of the Jakarta Platform specifications. The Jakarta Platform is the successor of the Java EE platform, which defines a set of APIs and features for developing enterprise applications. WildFly 21 supports both the Jakarta EE Full Platform and the Jakarta EE Web Profile, as well as the Eclipse MicroProfile platform, which provides a set of specifications for building cloud-native microservices.
download wildfly 21
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Features and benefits of WildFly 21
Some of the features and benefits of WildFly 21 are:
It is based on a modular service container architecture that enables services on-demand when your application requires them.
It supports hot deployment and dynamic reloading of applications, which means you can update your applications without restarting the server.
It provides high performance, scalability, and reliability for your applications, with features such as clustering, load balancing, caching, messaging, transactions, security, and management.
It offers a variety of ways to install and run the server, such as unzipping the traditional server zip, provisioning a customized server using the Galleon tool, or building and running a bootable JAR that contains both the server and your application.
It is compatible with popular development tools and frameworks, such as Maven, Gradle, Eclipse, IntelliJ IDEA, Spring Boot, Quarkus, etc.
It is free and open source, with an active community of developers and users.
WildFly 21 vs other application servers
How does WildFly 21 compare to other Java application servers? Here are some points to consider:
WildFly 21 is one of the few application servers that support both Jakarta EE Full Platform and Jakarta EE Web Profile. Other application servers may only support one or the other, or none at all.
WildFly 21 is also one of the few application servers that support Eclipse MicroProfile platform, which is a standard for building cloud-native microservices. Other application servers may have their own proprietary solutions for microservices.
WildFly 21 has a smaller footprint and faster startup time than most other application servers. This makes it ideal for cloud deployment scenarios where resources are limited and speed is essential.
WildFly 21 has more frequent releases than most other application servers. This means it can deliver new features and bug fixes more quickly to its users.
How to download WildFly 21
The first step to install WildFly 21 is to download it from its official website. There are different options for downloading WildFly 21 depending on your needs.
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Wildfly 21 batch-jberet galleon layer for jakarta batch
Wildfly 21 ejb galleon layer for jakarta enterprise beans
Wildfly 21 ejb-dist-cache galleon layer for infinispan distributed caching
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How to customize wildfly bootable jar using maven plugin parameters
How to provision a customized wildfly instance using galleon cli tool
How to run wildfly bootable jar as a service on linux or windows
How to debug wildfly bootable jar applications using eclipse or intellij idea
How to monitor wildfly bootable jar performance and metrics using prometheus and grafana
How to secure wildfly bootable jar applications using keycloak and openid connect
How to test wildfly bootable jar applications using arquillian and junit
How to build a microservice architecture using wildfly bootable jar and quarkus
How to use docker and kubernetes to deploy and scale wildfly bootable jar applications
How to use camel and kafka to integrate wildfly bootable jar applications with other systems
How to use hibernate and postgresql to persist data in wildfly bootable jar applications
How to use resteasy and jax-rs to expose restful web services in wildfly bootable jar applications
How to use cdi and weld to implement dependency injection in wildfly bootable jar applications
How to use bean validation and hibernate validator to validate data in wildfly bootable jar applications
How to use jpa and eclipselink to access relational databases in wildfly bootable jar applications
How to use jaxb and moxy to handle xml data in wildfly bootable jar applications
How to use jms and hornetq to send and receive messages in wildfly bootable jar applications
How to use jta and narayana to manage transactions in wildfly bootable jar applications
Download options for WildFly 21
You can download WildFly 21 from . You will see three main options:
WildFly Distribution: This is the traditional server zip file that contains the full server distribution. You can unzip it to any location on your system and run it as a standalone server or as a domain of servers. This option is suitable for most users who want to try out WildFly 21 or use it for development and testing purposes.
WildFly Galleon: This is a tool that allows you to provision a customized server based on your application needs. You can select the features and layers that you want to include in your server, and Galleon will create a tailored server for you. This option is suitable for users who want to optimize their server size and performance, or who want to use WildFly 21 as an embedded server.
WildFly Bootable JAR: This is a way to package your application and the server into a single executable JAR file that can be run with a simple java -jar command. This option is suitable for users who want to simplify their deployment process, or who want to use WildFly 21 as a microservice platform.
System requirements for WildFly 21
Before you download WildFly 21, you should check the system requirements for running it. The minimum system requirements are:
A Java Development Kit (JDK) version 8 or higher. You can download the JDK from .
A minimum of 128 MB of free memory for the server and 512 MB of free memory for the application.
A minimum of 100 MB of free disk space for the server and 500 MB of free disk space for the application.
A supported operating system, such as Windows, Linux, MacOS, or Solaris.
How to install WildFly 21
Once you have downloaded WildFly 21, you can install it on your system using one of the following methods:
Installing WildFly 21 from a zipped distribution
This is the easiest way to install WildFly 21. You just need to unzip the downloaded file to any location on your system. For example, if you downloaded the file wildfly-21.0.0.Final.zip to your Downloads folder, you can unzip it using the following command:
unzip /Downloads/wildfly-21.0.0.Final.zip -d /wildfly
This will create a folder named wildfly in your home directory, which contains the server files. You can rename or move this folder to any location you prefer.
Installing WildFly 21 with Galleon
This is a more advanced way to install WildFly 21. You need to download and install Galleon first, which is available from . You can download the latest version of Galleon, which is galleon-4.2.9.Final.zip at the time of writing, and unzip it to any location on your system. For example, if you downloaded the file galleon-4.2.9.Final.zip to your Downloads folder, you can unzip it using the following command:
unzip /Downloads/galleon-4.2.9.Final.zip -d /galleon
This will create a folder named galleon in your home directory, which contains the Galleon tool files. You can rename or move this folder to any location you prefer.
Next, you need to use Galleon to provision a customized server based on your application needs. You can