JavaLens MCP

JavaLens is an MCP server that provides 75 semantic analysis tools for Java, built on Eclipse JDT. It enables AI agents to perform compiler-accurate code understanding, including navigation, refactoring, search, and metrics, overcoming the limitations of text-based search by resolving type hierarchies, method overloading, and generic types.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Community listingLocal stdioSource reviewed; not executedPublished by pzalutski-pixel

Vendor documentation

What you can do with it

Find all references to a specific method call accurately
Refactor code using semantic understanding of type hierarchies
Analyze class types and dependencies before modification
Resolve Lombok-generated members and generic type arguments

Source and maintenance

Community listingRegistry 1.5.3

mcp-registry: io.github.pzalutski-pixel/javalens@1.5.3 Source repository

Maintenance checked: Oct 31, 2026, 10:59 PM UTC

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

javalens-mcp 1.5.3

npmnpx

javalens-mcp package definition

{
  "version": "1.5.3",
  "transport": "stdio",
  "identifier": "javalens-mcp",
  "runtimeHint": "npx",
  "registryType": "npm",
  "environmentVariables": [
    {
      "name": "JAVA_PROJECT_PATH",
      "format": "string",
      "description": "Auto-load project on startup"
    },
    {
      "name": "JAVALENS_TIMEOUT_SECONDS",
      "format": "number",
      "description": "Time limit on each tool call in seconds (5-300); unset means no limit"
    },
    {
      "name": "JAVALENS_LOG_LEVEL",
      "format": "string",
      "default": "INFO",
      "description": "Log level: TRACE, DEBUG, INFO, WARN, ERROR"
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

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Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.

Cursor configuration

{
  "mcpServers": {
    "javalens-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "javalens-mcp@1.5.3"
      ],
      "env": {
        "JAVA_PROJECT_PATH": "<YOUR_JAVA_PROJECT_PATH>",
        "JAVALENS_TIMEOUT_SECONDS": "<YOUR_JAVALENS_TIMEOUT_SECONDS>",
        "JAVALENS_LOG_LEVEL": "<YOUR_JAVALENS_LOG_LEVEL>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.

Cline configuration

{
  "mcpServers": {
    "javalens-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "javalens-mcp@1.5.3"
      ],
      "env": {
        "JAVA_PROJECT_PATH": "<YOUR_JAVA_PROJECT_PATH>",
        "JAVALENS_TIMEOUT_SECONDS": "<YOUR_JAVALENS_TIMEOUT_SECONDS>",
        "JAVALENS_LOG_LEVEL": "<YOUR_JAVALENS_LOG_LEVEL>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.

VS Code configuration

{
  "servers": {
    "javalens-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "javalens-mcp@1.5.3"
      ],
      "env": {
        "JAVA_PROJECT_PATH": "<YOUR_JAVA_PROJECT_PATH>",
        "JAVALENS_TIMEOUT_SECONDS": "<YOUR_JAVALENS_TIMEOUT_SECONDS>",
        "JAVALENS_LOG_LEVEL": "<YOUR_JAVALENS_LOG_LEVEL>"
      }
    }
  }
}

Claude Desktop

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Claude Desktop configuration

{
  "mcpServers": {
    "javalens-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "javalens-mcp@1.5.3"
      ],
      "env": {
        "JAVA_PROJECT_PATH": "<YOUR_JAVA_PROJECT_PATH>",
        "JAVALENS_TIMEOUT_SECONDS": "<YOUR_JAVALENS_TIMEOUT_SECONDS>",
        "JAVALENS_LOG_LEVEL": "<YOUR_JAVALENS_LOG_LEVEL>"
      }
    }
  }
}

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