Spring Boot Migrator (SBM)

❗	We’re revamping Spring Boot Migrator. Read more here.

Spring Boot Migrator (SBM) aims to help developers upgrade or migrate to Spring Boot by providing recipes for automated migrations.

Support and Requirements

✅ Java, JDK 17 ✅ Maven ❌ Kotlin ❌ Gradle

Documentation

• User documentation

• Developer documentation

Spring Boot 3.0 Upgrade - Interactive Web UI

We are working on automated upgrade from Spring Boot 2.7 to Spring Boot 3.0.

Click the image to watch a demo video [2:26]

Try the Spring Boot Upgrade Tool

ℹ️	Use JDK 17

1. Download the spring-boot-upgrade.jar

2. Run java -jar --add-opens java.base/sun.nio.ch=ALL-UNNAMED --add-opens java.base/java.io=ALL-UNNAMED spring-boot-upgrade.jar <path-to-application>

If any of your applications is on 2.7 and uses Maven (Gradle is currently not supported), we’d be happy if you could give SBM a try and provide feedback of how it worked out. It is very hard to come up with all the possible setups found in the wild and therefor we need you - the community - to provide feedback to stabilize the recipe.

Thank you!

Contributing

Any contribution is appreciated! If you want to get involved, please have a look at Spring Boot 3 Upgrade Report Contribution Guideline where we provide information related to contributing to the Spring Boot 3 Upgrade. Please don’t hesitate to ask questions and provide feedback.

Find the list of Spring Boot 3 Upgrade related issues labeled as good first issue here

If you decided you want to work on an issue, leave a comment letting us know that you want to work on it and we go from there.

Thank you!

JEE to Spring Boot Migration

Spring Boot Migrator offers recipes to migrate JEE applications to Spring Boot.

These specifications are covered (to some extent and varying completeness)

• Servlet

• JAX-RS

• SOAP

• JMS

• EJB

• JPA

• ejb-jar.xml

• weblogic-ejb-jar.xml

Click the image to watch a demo video [16:57]

How SBM works

Spring Boot Migrator uses and is compatible with OpenRewrite, a powerful mass refactoring ecosystem for Java and other source code.

Spring Boot Migrator offers a CLI to run recipes to migrate or upgrade a given application to Spring Boot. For developing new and custom recipes, SBM provides an opinionated API compatible with OpenRewrite recipes and a set of specialized resource representations to simplify recipe development for Spring Boot.

Scan application

A given codebase is scanned and a set of recipes gets evaluated against the codebase.

Apply a recipe

The list of applicable recipes is displayed and recipes can be selected from the list to be run against the codebase.
The recipes either apply automated migrations or guide users on their migration journey.

Spring Boot 3.0 Migrator - Java CLI

• Download the latest release from here: Spring Boot Migrator Releases

• Start the application: java -jar spring-boot-migrator.jar

• In the CLI start by scanning the application scan <path-to-application>

• From the list of applicable recipes select the one you want to apply,
  e.g.: apply initialize-spring-boot-migration
  Spring Boot Migrator will now apply the migrations defined in the recipe to the codebase.

• To get help when using SBM use the help command

ℹ️	When using Windows you must either escape \ or use / as path separator, e.g. C:\\my\\app or C:/my/app

ℹ️	SBM requires a JDK 17.

Building from source

• Clone the repository

• Change into root dir

• Run mvn clean install

• Find the jar in applications/spring-shell/spring-boot-migrator.jar

⚠️	Some integration tests use Docker so you’ll need Docker to run them. You can pass the -DskipTests flag to the mvn command to ignore tests.

Contributing

If you have not previously done so, please sign the Contributor License Agreement. You will be reminded automatically when you submit the pull request.

All contributions are welcome.

Please refer to the CONTRIBUTING.adoc for more details.

This project requires Java 17.

License

Apache License v2.0