Feature Request: Add Maven Project Support

[oscarvarto]

Feature Request: Add Maven Project Support

Add Maven project import support to kotlin-lsp, enabling the Language Server to work with Maven-based Kotlin/Java projects in addition to the currently supported Gradle projects.

Currently, kotlin-lsp only supports Gradle JVM projects out-of-the-box (as noted in the README). Many JVM projects, use Maven as their build system.

Key Use Cases:

• Enterprise projects with established Maven infrastructure
• Mixed Java/Kotlin codebases using Maven
• Java projects migrating to Kotlin incrementally
• Projects that prefer Maven's declarative approach
• Legacy Java codebases adding Kotlin support

Trying to fill a need (knowing the repo doesn't accept direct contributions now)

See oscarvarto@cf800ad

1. Leverages Existing IntelliJ APIs

• Uses org.jetbrains.idea.maven.project.MavenProjectReader for POM parsing
• Adapts patterns from IntelliJ's KotlinMavenImporter and KotlinMavenImporterEx
• Ensures compatibility with IntelliJ Platform's Maven support

2. Follows GradleWorkspaceImporter Pattern

• Same entity structure (ModuleEntity, LibraryEntity, KotlinSettingsEntity)
• Same naming convention (.main and .test modules)
• Same error handling approach (WorkspaceImportException)

3. Importer Order

Placed before GradleWorkspaceImporter because:

• Some projects have both pom.xml and Gradle files
• If Maven is present, it's typically the primary build system
• Users can override with workspace.json if needed

4. Testing Approach

Follows existing test pattern:

• Imports Maven project → converts to WorkspaceData
• Compares with expected workspace.json
• Validates round-trip conversion

Related Issues/PRs

This addresses the roadmap item from README.md:

* [ ] Project import
  * [x] Gradle JVM project import
  * [ ] Maven/Amper import  <-- This feature request

[strangepleasures]

Thanks for your input. Maven support is definitely in our plans.