`typeHierarchyProvider` always returns null

[Hanatarou]

Environment

• Server: IntelliJ Language Server by JetBrains
• Version: LS-262.4739.0
• OS: Windows 11
• JDK: JBR 25.0.2+1-b432.38 (bundled)
• Client: CudaText with LSP plugin

Problem

typeHierarchyProvider is announced in server capabilities but always returns null for any symbol.

Steps to Reproduce

1. Open a Kotlin file with a simple hierarchy (see attached test file lsp_kotlin_test.kt)
2. Request textDocument/prepareTypeHierarchy on any class, interface, or enum
3. Server always returns null

Logs

Server capabilities announce typeHierarchy:
"typeHierarchyProvider": true

Server responds null to every prepareTypeHierarchy request:
{"jsonrpc":"2.0","id":3,"result":null}
{"jsonrpc":"2.0","id":4,"result":null}
{"jsonrpc":"2.0","id":5,"result":null}
{"jsonrpc":"2.0","id":6,"result":null}

Client log confirms:
Prepare type hierarchy: no result [49ms]
Prepare type hierarchy: no result [60ms]
Prepare type hierarchy: no result [31ms]
Prepare type hierarchy: no result [35ms]

Expected Behavior

textDocument/prepareTypeHierarchy should return supertypes and subtypes for Kotlin symbols.

Attachments

• lsp_kotlin_test.kt (test file): lsp_kotlin_test.kt.txt
• main.log (client log): main.log
• lsp_server_jetbrains-kotlin-lsp.log (server log): lsp_server_jetbrains-kotlin-lsp.log

[fedochet]

Hi there @Hanatarou!

Sorry for that inconsistency - unfortunately, the type hierarchy requests are not yet supported by the server

The fact that the server tells that this feature is supported is a bug

However, we plan on implementing type hierarchy in the future releases

Internal issue: LSP-505