[BUG] LSP tool returns "No LSP server available for file type: .java" despite jdtls-lsp plugin enabled and jdtls installed

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Environment

| Component | Version |
|--------------|----------------------------|
| Claude Code | 2.0.76 |
| macOS | 26.1 (Build 25B78) |
| Architecture | Apple Silicon (aarch64) |
| Java | Oracle GraalVM 25+37.1 LTS |
| jdtls | 1.54.0 (via Homebrew) |
| jdtls path | /opt/homebrew/bin/jdtls |

Plugin Configuration

~/.claude/settings.json:
{
"enabledPlugins": {
"typescript-lsp@claude-plugins-official": true,
"jdtls-lsp@claude-plugins-official": true
}
}

~/.claude/plugins/installed_plugins.json confirms jdtls-lsp@claude-plugins-official is installed at version 1.0.0.

Steps to Reproduce

Actual Behavior

No LSP server available for file type: .java

Additional Context

• The plugin cache directory (~/.claude/plugins/cache/claude-plugins-official/jdtls-lsp/1.0.0/) only contains a README.md file, no actual plugin code
• TypeScript LSP plugin has the same structure (only README.md) but TypeScript LSP may work differently
• jdtls --help works correctly from terminal
• The Java project is a standard Maven multi-module project with pom.xml files

What Should Happen?

LSP tool should connect to jdtls and return references/definitions/hover info for Java files.

Error Messages/Logs

Steps to Reproduce

1. Install jdtls via Homebrew: brew install jdtls
2. Enable jdtls-lsp plugin in Claude Code
3. Open a Java project (Maven/Quarkus multi-module project)
4. Use the LSP tool with any operation on a .java file:

LSP findReferences on ApplicationService.java line 119

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.0.76

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_