jfr-analyzer-mcp

A Model Context Protocol (MCP) server for analyzing Java Flight Recorder (JFR) files. This server provides tools to analyze JFR recordings and generate comprehensive performance reports using Java Mission Control's rule-based analysis.

Features

• JFR File Analysis: Load and analyze Java Flight Recorder files
• Rule-Based Reports: Generate reports using JMC's built-in analysis rules
• MCP Integration: Exposes analysis capabilities as MCP tools for AI assistants
• Performance Insights: Provides summaries, explanations, and solutions for performance issues

Usage

This MCP server exposes a single tool:

• getReport: Get a full analysis report of a JFR file
  • Parameter: jfrFilePath (absolute path to the JFR file)
  • Returns: Comprehensive analysis including rule IDs, summaries, explanations, and solutions

Running the MCP Server

Development Mode

Run the server in dev mode with live coding:

./mvnw quarkus:dev

NOTE: Quarkus ships with a Dev UI, available in dev mode at http://localhost:8080/q/dev/.

As MCP Server

To use this MCP server with an MCP client (like Claude Desktop), configure it in your MCP client settings:

{
  "mcpServers": {
    "jfr-analyzer": {
      "command": "java",
      "args": [
        "-jar",
        "/path/to/jfr-analyzer-mcp-1.0.0-SNAPSHOT-runner.jar"
      ]
    }
  }
}

For development, you can also run:

./mvnw quarkus:dev

Then configure your MCP client to connect to stdio.

Packaging and Running

Build the application:

./mvnw package

This produces the quarkus-run.jar file in target/quarkus-app/.

To build an über-jar (recommended for MCP server deployment):

./mvnw package -Dquarkus.package.jar.type=uber-jar

The über-jar can be run with:

java -jar target/*-runner.jar

Using with Claude Desktop

1. Build the über-jar
2. Update Claude Desktop's claude_desktop_config.json:

{
  "mcpServers": {
    "jfr-analyzer": {
      "command": "java",
      "args": [
        "-jar",
        "/Users/adit/development/projects/jfr-analyzer-mcp/target/jfr-analyzer-mcp-1.0.0-SNAPSHOT-runner.jar"
      ]
    }
  }
}

1. Restart Claude Desktop

Native Executable

Create a native executable for faster startup and lower memory footprint:

./mvnw package -Dnative

Or build in a container:

./mvnw package -Dnative -Dquarkus.native.container-build=true

Run the native executable:

./target/jfr-analyzer-mcp-1.0.0-SNAPSHOT-runner

Learn more: https://quarkus.io/guides/maven-tooling

Testing

Run all tests:

./mvnw test

Run specific test class:

./mvnw test -Dtest=JfrAnalysisServiceTest

Run specific test method:

./mvnw test -Dtest=JfrAnalysisServiceTest#loadRecording

Technical Details

• Java Version: 21
• Framework: Quarkus 3.26.3
• JMC Version: 9.1.1
• MCP Protocol: stdio transport via quarkus-mcp-server-stdio

Key Dependencies

• quarkus-mcp-server-stdio: MCP server integration
• org.openjdk.jmc.*: JMC libraries for JFR analysis
• quarkus-cache: Caching support
• quarkus-arc: CDI container

Related Guides

• Quarkus MCP Server: MCP server stdio integration
• Quarkus Cache: Application data caching
• Java Flight Recorder: JFR documentation