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jCasbin

Oct 2025, 23. by Sergio del Amo Permalink

jCasbin is a powerful and efficient open-source access control library for Java projects. It provides support for enforcing authorization based on various access control models.

System Rules

Oct 2025, 21. by Sergio del Amo Permalink

A collection of JUnit rules for testing code that uses java.lang.System.

Add an MCP Server to GitHub Copilot in IntelliJ IDEA

Oct 2025, 03. by Sergio del Amo

To register a MCP Server in GitHub Copilot for IntelliJ IDEA, change to Agent model, click the Tools icon and click Add More Tools...

Enter your MCP Server in the mcp.json configuration file. The following example shows an MCP Server packaged as a FAT jar which uses STDIO transport.

{
	"servers": {
	  "diskspace": {
		"type": "stdio",
		"command": "java",
		"args": ["-jar", "/Users/sdelamo/bin/diskspace-0.1-all.jar"]
	  }

	}
}

Add an MCP Server to Claude Desktop

Oct 2025, 03. by Sergio del Amo

To register a MCP Server in Claude Desktop, click on Settings, click the Developer, and click Edit Config

Enter your MCP Server in the claude_desktop_config.json configuration file. The following example shows an MCP Server packaged as a FAT jar which uses STDIO transport.

{
  "mcpServers": {
    "diskspace": {
      "command": "java",
      "args": ["-jar", "/Users/sdelamo/bin/diskspace-0.1-all.jar"]
    }
  }
}

Add an MCP Server to Claude Code

Oct 2025, 03. by Sergio del Amo Permalink

You can connect Claude Code to tools via MCP. You can use the claude mcp add command to add an MCP server.

claude mcp add --transport http micronautfun https://micronaut.fun/mcp

The previous command adds an entry in the mcpServers of the project:

"mcpServers": {
   "micronautfun": {
     "type": "http",
     "url": "https://micronaut.fun/mcp"
   }
},

These commands modify the vi $HOME/.claude.json configuration file.

You can list your project MCP servers with the claude mcp list command.

Add an MCP Server to VS Code

Oct 2025, 03. by Sergio del Amo

To register a MCP Server in VS Code open the command palette with (CMD + Shift + P) and search for "Add MCP"

Select your MCP Server transport (STDIO or HTTP)

If HTTP, enter your MCP Server URL.

Select whether you want to install the MCP Server globally or for the current workspace only.

Enter your MCP Server in the mcp.json configuration file.

The following example shows an MCP Server which uses Streamable HTTP transport.

{
  "servers": {
    "micronautfun": {
      "url": "https://micronaut.fun/mcp",
      "type": "http"
    }
  },
  "inputs": []
}

You should see your MCP listed as installed.

OSS-Fuzz

Aug 2025, 02. by Sergio del Amo Permalink

OSS-Fuzz aims to make common open source software more secure and stable by combining modern fuzzing techniques with scalable, distributed execution.

Micronaut is using this great initiative by Google.

📼 Micronaut Gradle GitHub Actions

Jul 2025, 31. by Sergio del Amo Permalink

In this video, I created a Micronaut application built with Gradle. I pushed it to a GitHub repository and I set up a continuous integration server with GitHub Actions

MCP Resources

Jul 2025, 17. by Sergio del Amo

Collection of links to Model Context Protocol (MCP) resources, including videos, articles, and tools.

The Model Context Protocol (MCP) was open sourced by Anthropic in November 2024 to provide users and developers with an easy way to extend the capabilities of AI-powered apps by integrating them with data sources and applications.

Model Context Protocol (MCP)

Courses

Anthropic Academy

Courses

Videos

Why MCP really is a big deal with Tim Berglund

MCP Java SDK

Spring

Spring AI MCP

MCP Server Spring Boot Starter Documentation

Build an MCP Server with Java

Jul 2025, 15. by Sergio del Amo

This session shows how to build an MCP (Model Context Protocol) server in Java.

We first discuss how to build an MCP server with Java without any framework, and then compare what the frameworks (Spring Boot, Micronaut, and Quarkus) offer.

We will implement an MCP server with each framework. The MCP server will expose custom tools that can be accessed by MCP clients.

You will learn how to test your implementation using the MCP Inspector tool and connect to your MCP server with Claude as a client.

Target Audience

Developers interested in creating an MCP (Model Context Protocol) server in Java.

Elevator Pitch

MCP allows you to expose reusable tools and resources to build agentic microservices. Doing this takes us beyond basic LLM chatbots to dynamic, problem-solving systems that deliver real value in real professional settings. In this session, you will learn how to build your first MCP server.