Practitioner (own blog/paper) Library migration
Google estimates ~89% time saved on Joda-Time → java.time migration clusters
Google clustered Joda-Time usages via Kythe cross-references so related files could be migrated in one prompt, then built, tested and fixed failures automatically. The migration was still ongoing at the time of writing.
The numbers (as reported)
| Time saved on small clusters (estimate) | ~89% |
|---|
Facts
- Company / subject
- Tools
- Gemini (fine-tuned, internal toolkit)
- Codebase
- brownfield
- Work type
- Library migration
- Stack
- Java
- Published
- 2025-01
- Last checked
- 2026-10-17
Caveats
Ongoing migration; estimate comes from tech leads comparing against the manual approach, extrapolated from a sample of changelists.