# Wildfly (JBoss AS) to SpringBoot Application Conversion

# Introduction

The purpose of article is to provide developers and software engineers with a structured guide for converting an application from [WildFly formerly known as JBoss AS](https://cloudtuned.hashnode.dev/wildfly-formerly-known-as-jboss-as) to Spring Boot

# High Level Steps

In this guide, we will cover various aspects of the conversion process steps required to convert your Wildfly application to Spring Boot, including:

-   Evaluating the existing Wildfly application architecture and dependencies.
-   Identifying and replacing Wildfly-specific dependencies with Spring Boot equivalents.
-   Migrating configuration files and settings to Spring Boot's conventions.
-   Refactoring enterprise components, such as Enterprise Java Beans (EJBs), to Spring components.
-   Rewriting integration points with Wildfly-specific features to use Spring Boot's integration mechanisms.
-   Updating the build configuration and deployment process to align with Spring Boot practices.
-   Testing, debugging, and deploying the migrated application in a Spring Boot-compatible environment.
-   Providing documentation and training resources to ensure a smooth transition for the development team.

Migration Process
=================

Converting an application from Wildfly to Spring Boot involves migrating configurations, dependencies, and codebase to align with Spring Boot's conventions and best practices. Here's a high-level overview of the conversion process:

### 1\. Evaluate Current Application:

-   Understand the architecture, dependencies, and configurations of the existing Wildfly application.

### 2\. Identify Dependencies:

-   Review and identify dependencies specific to Wildfly, such as JBoss modules or proprietary APIs, and find equivalent libraries or frameworks compatible with Spring Boot.

### 3\. Convert Configuration:

-   Migrate Wildfly-specific configuration files (e.g., **standalone.xml**, **persistence.xml**) to Spring Boot's configuration format (**application.properties** or **application.yml**).

### 4\. Refactor Enterprise Components:

-   Convert **Enterprise Java Beans** (EJBs) to Spring components (e.g., **Spring beans**, **Spring Data** repositories) using Spring's annotations and programming model.

### 5\. Rewrite Integration Points:

-   If applicable rewrite integration points with Wildfly-specific features (e.g., **JMS messaging**, **JNDI lookup**) to use Spring Boot's integration mechanisms (e.g., **Spring JMS**, **Spring Data JPA**, Spring Boot Starter for JNDI).

### 6\. Update Build Configuration:

-   Update the build configuration (e.g., **Maven**, **Gradle**) to include Spring Boot dependencies and plugins required for packaging and running the application as well as removing all of the **Wildfly** dependencies.

### 7\. Test and Debug:

-   Thoroughly test the migrated application to ensure that all functionalities work as expected.
-   Debug any issues that arise during the migration process and address them accordingly.

### 8\. Deployment:

-   Deploy the migrated application to a Spring Boot-compatible environment (e.g., **Tomcat**, **Jetty**) and verify its functionality in the new environment. 

### 9\. Continuous Integration/Continuous Deployment (CI/CD):

-   Integrate the migrated project into your CI/CD pipeline to automate the build, test, and deployment processes.

### 10\. Documentation and Training:

-   Document the migration process and any changes made to the project's architecture, configuration, and codebase.
-   Provide training or knowledge transfer sessions to team members to familiarize them with the new Spring Boot-based architecture.

# Conclusion

By following the outlined steps we are able to migrate an application from one engine (Wildfly) to another (Spring Boot) leveraging the benefits of Spring Boot's lightweight architecture.