[jdtls] Equinox launcher JAR missing version in filename causes "Cannot find equinox launcher" error

[naxvan]

I've searched open issues for similar requests

• Yes

I've recently downloaded the latest plugin version of mason.nvim

• Yes

Problem description

Troubleshooting jdtls Installation in Neovim

Problem

• jdtls server fails to start after Mason installation
• Missing version suffix in org.eclipse.equinox.launcher.jar

Verification

ls ~/.local/share/nvim/mason/packages/jdtls/plugins/org.eclipse.equinox.launcher*

Error Details

• Exception: Cannot find equinox launcher
• Visible in :LspLog

Reference

Mason.nvim Issue #1849

Solution

Ensure Equinox launcher JAR has complete filename with version suffix.

Expected behavior

jdtls Mason Installation Issue

Problem

• jdtls server fails to start due to incorrectly named Equinox launcher JAR
• Missing version suffix prevents detection by jdtls.py

Diagnostic Commands

# Get JAR version from manifest
unzip -p ~/.local/share/nvim/mason/packages/jdtls/plugins/org.eclipse.equinox.launcher.jar META-INF/MANIFEST.MF | grep "Bundle-Version"

# Rename JAR with version (example)
mv ~/.local/share/nvim/mason/packages/jdtls/plugins/org.eclipse.equinox.launcher.jar \
   ~/.local/share/nvim/mason/packages/jdtls/plugins/org.eclipse.equinox.launcher_1.6.900.v20240613-2009.jar

Proposed Solutions

1. Mason packaging script should:
   • Download Equinox launcher JAR with correct versioned filename
   • Modify jdtls.py to accept both versioned and unversioned filenames

Environment Details

• Neovim: v0.9.5
• Mason.nvim: commit abc123
• Java: openjdk 17.0.11

Error Log

[ERROR] .../lsp/rpc.lua:770 "Cannot find equinox launcher"

Impact

Blocks Java development workflows for users relying on Mason-installed jdtls.

Affected packages

jdtls.py

Mason output

/home/user/.local/share/nvim/mason/packages/jdtls/bin/jdtls.py

Installation log

[ERROR][2025-01-25 14:49:03] .../vim/lsp/rpc.lua:770	"rpc"	"/home/naxvan/.local/share/nvim/mason/bin/jdtls"	"stderr"	'Traceback (most recent call last):\n  File "/home/naxvan/.local/share/nvim/mason/packages/jdtls/bin/jdtls", line 17, in <module>\n    jdtls.main(sys.argv[1:])\n    ~~~~~~~~~~^^^^^^^^^^^^^^\n  File "/home/naxvan/.local/share/nvim/mason/packages/jdtls/bin/jdtls.py", line 91, in main\n    jar_path = find_equinox_launcher(jdtls_base_path)\n  File "/home/naxvan/.local/share/nvim/mason/packages/jdtls/bin/jdtls.py", line 56, in find_equinox_launcher\n    raise Exception("Cannot find equinox launcher")\nException: Cannot find equinox launcher\n'

Neovim version (>= 0.7)

NVIM v0.10.3
Build type: Release
LuaJIT 2.1.1736781742

Operating system/version

Linux naxvan 6.8.0-51-generic #52-Ubuntu SMP PREEMPT_DYNAMIC Thu Dec 5 13:09:44 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

Healthcheck

==============================================================================
mason: require("mason.health").check()

mason.nvim ~
- OK mason.nvim version v1.10.0
- OK PATH: prepend
- OK Providers: 
    mason.providers.registry-api
    mason.providers.client
- OK neovim version >= 0.7.0

mason.nvim [Registries] ~
- OK Registry `github.com/nvim-java/mason-registry version: 2024-12-24-graceful-raft` is installed.
- OK Registry `github.com/mason-org/mason-registry version: 2025-01-25-sheer-datum` is installed.

mason.nvim [Core utils] ~
- OK unzip: `UnZip 6.00 of 20 April 2009, by Debian. Original by Info-ZIP.`
- OK wget: `GNU Wget 1.21.4 built on linux-gnu.`
- OK curl: `curl 8.11.1 (x86_64-pc-linux-gnu) libcurl/8.11.1 OpenSSL/3.4.0 zlib/1.3.1 brotli/1.1.0 zstd/1.5.6 libidn2/2.3.7 libssh2/1.11.1 nghttp2/1.64.0 librtmp/2.3 OpenLDAP/2.6.9`
- OK gzip: `gzip 1.12`
- OK tar: `tar (GNU tar) 1.35`
- OK bash: `GNU bash, version 5.2.21(1)-release (x86_64-pc-linux-gnu)`
- OK sh: `Ok`

mason.nvim [Languages] ~
- WARNING luarocks: not available
  - ADVICE:
    - spawn: luarocks failed with exit code - and signal -. luarocks is not executable
- WARNING Composer: not available
  - ADVICE:
    - spawn: composer failed with exit code - and signal -. composer is not executable
- WARNING PHP: not available
  - ADVICE:
    - spawn: php failed with exit code - and signal -. php is not executable
- WARNING Ruby: not available
  - ADVICE:
    - spawn: ruby failed with exit code - and signal -. ruby is not executable
- WARNING RubyGem: not available
  - ADVICE:
    - spawn: gem failed with exit code - and signal -. gem is not executable
- OK node: `v23.6.1`
- OK java: `java version "21.0.6" 2025-01-21 LTS`
- WARNING julia: not available
  - ADVICE:
    - spawn: julia failed with exit code - and signal -. julia is not executable
- OK python: `Python 3.13.1`
- OK cargo: `cargo 1.84.0 (66221abde 2024-11-19)`
- OK npm: `10.9.2`
- OK javac: `javac 21.0.6`
- OK pip: `pip 24.3.1 from /home/linuxbrew/.linuxbrew/Cellar/[email protected]/3.13.1/lib/python3.13/site-packages/pip (python 3.13)`
- OK python venv: `Ok`
- OK Go: `go version go1.23.5 linux/amd64`

mason.nvim [GitHub] ~
- OK GitHub API rate limit. Used: 0. Remaining: 60. Limit: 60. Reset: Sat 25 Jan 2025 05:15:45 PM -05.
  Install and authenticate via gh-cli to increase rate limit.

Screenshots

#1849 (comment)