How Do Developers Use Migration Guides? A Case Study of Log4j

2026-04-27

AI Summary

This study addresses the limited understanding of how migration guides are actually provided and utilized by developers, a gap that undermines their effectiveness in managing breaking changes in software libraries. Focusing on real-world usage practices, the work presents an empirical investigation centered on libraries with incompatible updates—such as Log4j—by analyzing pull request data and patterns of documentation referencing. The findings reveal that 82.81% of references point to entire migration guides rather than specific sections, and that these guides serve not only during major version upgrades but also play a sustained role in long-term maintenance. These insights offer empirically grounded recommendations for improving the design and utility of API migration documentation.

Technology Category

• Data Mining & Knowledge Management: Representing, Reasoning, and Using Provenance, Trust
• Application Domains: Mobility, Driving & Flight
• Multiagent Systems: Applications

Application Category

• User Modeling, Personalization and Recommendation: Practical large-scale studies of user experience
• Responsible Web: Consent frameworks and practices on the web
• Web Mining and Content Analysis: Bridging structured and unstructured data

Abstract

Migration guides are a form of software documentation that helps developers address breaking changes introduced in library version updates. Prior studies have examined documents such as release notes, API reference manuals, and patch notes. However, research that focuses specifically on migration guides remains limited. Improving the usability and coverage of migration guides is essential for helping developers resolve breaking changes efficiently. Yet, we still lack a clear understanding of how migration guides are currently provided and how developers use them in practice. To fill this gap, we first investigate whether libraries known to introduce incompatibilities provide migration guides. We then conduct a detailed case study on Log4j, a library that has experienced large-scale breaking updates in the past. We empirically analyze how developers refer to and use the official migration guide in real-world projects. We find that pull request authors most frequently reference the migration guide in the pull request description, and that most references (82.81\%) link to the entire guide rather than specific sections. We also find that developers use migration guides not only during major version updates but also during subsequent maintenance tasks, suggesting that the guides serve as a resource throughout the entire migration process.

Problem

• migration guides
• breaking changes
• software documentation
• library updates
• developer practices

Innovation

• migration guides
• breaking changes
• empirical study
• Log4j
• software documentation