# LSN-0037: Gradle Version Catalog for Dependency Management

## Original Problem
Dependency versions were scattered across the project, including hardcoded strings in `buildSrc` conventions and `build.gradle.kts` files. This fragmentation made maintenance difficult and prevented a clear overview of external dependencies.

## Consolidated Decision
Adopt `gradle/libs.versions.toml` (Version Catalog) as the single source of truth for all external dependencies and versions in the `prometeu-studio` repository.

## Final Implementation
1.  **Version Catalog Definition**: Centralized all external libraries in `gradle/libs.versions.toml` under the `[versions]` and `[libraries]` sections.
2.  **buildSrc Access**: Configured `buildSrc` to consume the same catalog by using the `VersionCatalogsExtension` in the `gradle.java-common-conventions.gradle.kts` file.
3.  **Convention Refactoring**: Updated Java common conventions to use `libs.findLibrary(...).get()` for resolving dependencies from the catalog.

### Example: Using Catalog in buildSrc (Kotlin DSL)
Since `buildSrc` is a separate build, the type-safe accessors (like `libs.lombok`) are not automatically generated in the same way as in the main project modules. We use the following pattern:

```kotlin
val libs = extensions.getByType<VersionCatalogsExtension>().named("libs")

dependencies {
    implementation(libs.findLibrary("lombok").get())
}
```

## Examples and Usage
In standard modules (`build.gradle.kts`), use the type-safe accessors provided by Gradle:

```kotlin
dependencies {
    implementation(libs.javafx.controls)
}
```

## Common Pitfalls
- **buildSrc Visibility**: Direct access like `libs.libraryName` might fail in `buildSrc` if the catalog isn't properly shared or if the accessor isn't generated for the `buildSrc` context. Using `VersionCatalogsExtension` is the most robust way to share it.
- **Naming Consistency**: Ensure library aliases in TOML follow a clear pattern (e.g., `slf4j-api` vs `slf4jApi`) to keep the build scripts readable.

## References
- [DEC-0023-gradle-version-catalog-adoption.md](../../workflow/decisions/DEC-0023-gradle-version-catalog-adoption.md)
- [PLN-0046-implement-gradle-version-catalog.md](../../workflow/plans/PLN-0046-implement-gradle-version-catalog.md)
