In this session, I will take participants on a live journey of migrating an old Java EE 6 application running on GlassFish 3 and JSF to a modern Quarkus application.

Using a concrete legacy project as an example, I will demonstrate step by step how I automated and accelerated the migration process with the help of OpenRewrite. I will address typical challenges that arise during migration, such as outdated libraries, API incompatibilities, and configuration-related obstacles. During the live demonstration, I will share my experiences, highlight potential pitfalls, and explain how I successfully overcame them.

The goal of this session is to provide participants with practical insights into migrating legacy applications and to demonstrate how the transition to a modern stack can be achieved. This talk is aimed at anyone tasked with modernizing existing applications and offers valuable inspiration for their own migration process.