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18:00 Networking, food, and drinks
18:30 Presentation
20:00 Beers!

Automated Refactoring for Java-Based Applications

2021-05-18 18:00 @ Online event – ,
55 attending

This talk will focus on how engineering teams can leverage automated refactoring tools that originated at Netflix to greatly reduce the time and effort required when migrating to new versions of frameworks like Spring and JUnit and between language versions.

Does this Scenario sound familiar?
Your organization has many Spring-based microservices and applications that are critical for the day-to-day operation of your business. Over time, you find that your applications have a large number of dependencies on third-party technologies and libraries that have different release cadences. Invariably, your organization encounters pressures to upgrade those dependencies for any number of the following reasons: critical bug fixes, security updates, expiring support, "modernization", or technical enablement. Refactoring a single application to update its third-party dependencies can be tricky and often requires manual intervention when there are breaking changes. At the organization level, performing the same refactoring operation across all of your applications can result in weeks of effort.
This talk introduces OpenRewrite, an open source ecosystem that specializes in mass, automated refactoring with a focus on on Java source code, Maven build files, XML, YAML, and property files. We will discuss how the framework enables the creation of composable, prepackaged recipes that can be used to automate common framework migration and how these recipes can be integrated into both Maven and Gradle builds.
This talk will include some live demonstrations of Rewrite's tools to perform automated migrations on real-world, Spring applications and libraries.

Speaker: Jonathan Schneider
Jonathan is co-founder and CEO of Moderne, a venture-backed enterprise software company delivering automated source code transformation. Moderne works to liberate engineers from tedious software maintenance tasks so they can do what they love: create! Previously, Jonathan was a member of the Spring Team where he founded Micrometer and at Netflix where he worked on Engineering Tools. Jonathan is the author of the O'Reilly book "SRE with Java Microservices", released in 2020.


The Seattle Java User’s group has been meeting since the mid-90s in the Seattle and Eastside area. It is geared towards topics related to the Java Virtual Machine and languages which run on it such as Java, etc. You can find us on

SeaJUG is an all volunteer effort – which means items such as the website and mailing list are updated as schedules afford. We meet on the 3rd Tuesday of every month. We need suggestions/volunteers for topics! If you’d like to donate your time/skills to the cause, please contact Nimret Sandhu.

Chair: Nimret Sandhu
Leadership Team: Samantha Berk, Freddy Guime, Ben Garnaat, Jonatan Ivanov
Founder: Jayson Raymond