Scala

Databricks · Aug 11, 2026

Open-sourcing Metals v2: Databricks’ Java and Scala language server for multi‑million line codebases

Databricks open-sourced Metals v2, a Scala and Java language server designed to provide low-latency code intelligence for multi-million-line Bazel monorepos, including its 26M-line repository. The project extends Metals v1 by reworking three layers: a build-free, content-addressed mbt repository index; compiler-backed Scala and Java pipelines using a Metals-provided sourcepath; and metadata-first BSP integration that keeps build synchronization off the startup path. Its Java implementation uses javac APIs and a modified Turbine header compiler, which processes close to one million Java lines per second on one thread and supports interactive analysis at nearly 100,000 lines per second in benchmarks. Metals v2 is available in Cursor, VS Code, and Neovim under Apache 2.0, while Databricks reports Cursor’s share of Scala and Java file-open events rising from 40% to 78%.