# ci

Continues Integration is the process of building and testing code changes automatically, whenever a developer pushes changes to a code repository.
Automated [GitHub workflows](/reference/code.md) compile code using a toolchain definition set in each respective workflow.

Some scenarios may require non-default versions of a toolchain, which is supported using standard tools.

## Scala
Scala projects may use [jenv](https://github.com/jenv/jenv) to manage a local JDK version that is different from the system version.

This allows setting a specific JDK version per repository, managed in a `.java-version` file.

## Javascript

NodeJS projects typically use [Volta](https://volta.sh/) to manage a local Node/NPM/Yarn version that is different from the system version.

This allows setting a specific version per repository, managed in the `package.json` file.