LSP4J를 사용하여 JDTLS (Eclipse JDT Language Server)를 감싸는 Java MCP (모델 Context Protocol) 서버는 Claude와 같은 AI 조수에 Java IDE 기능을 제공합니다.

특징

이 MCP 서버는 다음과 같은 도구를 노출:

필수품

• 자바 21+
• 평균 3.8+
• JDTLS 설치 (예 : Homebrew를 통해 : brew install jdtls)

빌드

이것은 target/lsp4j-mcp-1.0.0-SNAPSHOT.jar]에서 그늘진 JAR를 만듭니다.

사용법

옵션 1: 스크립트 실행

옵션 2: Java 명령을 지시

예:

옵션 3: 클로드 코드 MCP 구성

.mcp.json에 추가:

옵션 4: 도커

다단계 이미지를 만듭니다. 그것은 포함 자바 21, 그늘 MCP 서버, 그리고 Pinned Eclipse JDTLS 배급:

stdio를 실행하고 /workspace]에서 Java 프로젝트를 마운트:

LSP4J-MCP Server

A Java MCP (Model Context Protocol) server that wraps JDTLS (Eclipse JDT Language Server) using LSP4J to provide Java IDE features to AI assistants like Claude.

Features

This MCP server exposes the following tools:

Prerequisites

• Java 21+
• Maven 3.8+
• JDTLS installed (e.g., via Homebrew: brew install jdtls)

Build

mvn clean package

This creates a shaded JAR at target/lsp4j-mcp-1.0.0-SNAPSHOT.jar.

Usage

Option 1: Run Script

./run.sh /path/to/your/java/project

Option 2: Direct Java Command

java -jar target/lsp4j-mcp-1.0.0-SNAPSHOT.jar  

Example:

java -jar target/lsp4j-mcp-1.0.0-SNAPSHOT.jar /Users/me/projects/myapp jdtls

Option 3: Claude Code MCP Configuration

Add to your .mcp.json:

{
  "mcpServers": {
    "java-lsp": {
      "command": "java",
      "args": [
        "-jar",
        "/path/to/LSP4J-MCP/target/lsp4j-mcp-1.0.0-SNAPSHOT.jar",
        "/path/to/your/java/project",
        "jdtls"
      ],
      "env": {
        "LOG_FILE": "/tmp/lsp4j-mcp.log"
      }
    }
  }
}

Option 4: Docker

Build the multi-stage image. It includes Java 21, the shaded MCP server, and a pinned Eclipse JDTLS distribution:

docker build -t lsp4j-mcp:local .

Run it over stdio and mount the Java project at /workspace:

docker run --rm -i \
  --mount type=bind,source=/absolute/path/to/java/project,target=/workspace \
  lsp4j-mcp:local

On Linux, use the host UID/GID when the language server needs to write project metadata into the mounted workspace:

docker run --rm -i \
  --user "$(id -u):$(id -g)" \
  --mount type=bind,source=/absolute/path/to/java/project,target=/workspace \
  lsp4j-mcp:local

Example MCP configuration:

{
  "mcpServers": {
    "java-lsp-docker": {
      "command": "docker",
      "args": [
        "run",
        "--rm",
        "-i",
        "--mount",
        "type=bind,source=/absolute/path/to/java/project,target=/workspace",
        "lsp4j-mcp:local"
      ]
    }
  }
}

The server uses stdio, so the image exposes no network port. Container logs are written to stderr while stdout remains reserved for the MCP protocol. The image runs as UID/GID 10001 by default and expects at least 1 GB of container memory.

Project Structure

LSP4J-MCP/
├── pom.xml                              # Maven build configuration
├── run.sh                               # Startup script