Migrating Large-scale Scala Projects to Explicit-nulls with the Help from LLMs (The Scala Workshop 2025) - The Scala Workshop 2025

Mon 13 - Tue 14 October 2025 Singapore

co-located with ICFP/SPLASH 2025

Track

The Scala Workshop 2025

This program is tentative and subject to change.

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When

Mon 13 Oct 2025 15:00 - 15:20 at Peony West - Noon Chair(s): Oliver Bračevac, Hamza Remmal

Abstract

This talk presents our experience using Large Language Models (LLMs) to migrate large Scala projects to Scala 3’s explicit nulls feature. We discuss challenges from previous migration attempts, enhancements we made to migration tooling, and a practical LLM-powered workflow tested on the Scala standard library, a large codebase with extensive null usage.

File attachments

Paper (migration_with_LLMs.pdf)	299KiB

This program is tentative and subject to change.

Time Zone

The program is currently displayed in (GMT+08:00) Perth.

Use conference time zone: (GMT+08:00) PerthSelect other time zone

The GMT offsets shown reflect the offsets at the moment of the conference.

Time Band

By setting a time band, the program will dim events that are outside this time window. This is useful for (virtual) conferences with a continuous program (with repeated sessions).
The time band will also limit the events that are included in the personal iCalendar subscription service.

Display full programSpecify a time band

Session Program

Mon 13 Oct
Displayed time zone: Perth change

	13:40 - 15:20	NoonThe Scala Workshop 2025 at Peony West Chair(s): Oliver Bračevac EPFL, LAMP, Hamza Remmal EPFL, LAMP

	13:40 20m Talk		The Quest for Mutable Value Semantics in Scala The Scala Workshop 2025 Dimi Racordon EPFL, LAMP File Attached
	14:00 20m Talk		How Functional is Direct-Style? The Scala Workshop 2025 Adam Warski SoftwareMill File Attached
	14:20 20m Talk		ScalaF: Functional Refactoring Suggestions for Scala The Scala Workshop 2025 Shiv Kiran Bagathi Indian Institute of Technology Bombay, Shrikha Mahanty Indian Institute of Technology Mandi, Dasari Gnana Heemmanshuu Indian Institute of Technology Bombay, Manas Thakur IIT Bombay File Attached
	14:40 20m Talk		Debugging for Scala Control Flow DSLs The Scala Workshop 2025 Finn Hackett University of British Columbia, Ivan Beschastnikh The University of British Columbia
	15:00 20m Talk		Migrating Large-scale Scala Projects to Explicit-nulls with the Help from LLMs The Scala Workshop 2025 Yaoyu Zhao EPFL, LAMP File Attached

Yaoyu Zhao

EPFL, LAMP