Personal site of Dan Vega https://www.danvega.dev en-us Mon, 20 Apr 2026 13:21:36 GMT danvega@gmail.com (Dan Vega) danvega@gmail.com (Dan Vega) Learn how to add tools and MCP servers to your Embabel agents in Java. Build a blog writing agent that can research topics, calculate reading time, and generate front matter. https://www.danvega.dev/blog/embabel-mcp-servers-and-tools https://www.danvega.dev/blog/embabel-mcp-servers-and-tools Fri, 10 Apr 2026 08:00:00 GMT Dan Vega Spring AI Embabel Java A first look at Embabel, a framework by Rod Johnson for building agentic AI flows on the JVM. Learn how to create a blog writing agent with goal-oriented action planning. https://www.danvega.dev/blog/embabel-first-look https://www.danvega.dev/blog/embabel-first-look Thu, 02 Apr 2026 08:00:00 GMT Dan Vega Spring AI Java Learn how to build scalable GraphQL APIs with Java 26 and Spring Boot 4. This course walks you through schema-first development, batch loading, unions, Query by Example, AOT repositories, and more. https://www.danvega.dev/blog/getting-started-with-graphql-for-java-developers https://www.danvega.dev/blog/getting-started-with-graphql-for-java-developers Wed, 01 Apr 2026 08:00:00 GMT Dan Vega Spring Boot Java GraphQL Learn how to build an autonomous coding agent in Spring AI using the Spring AI Agent Utils library. This tutorial walks you through creating a CLI-based agent with file system access, shell commands, and skills. https://www.danvega.dev/blog/spring-building-me-a-coding-agent https://www.danvega.dev/blog/spring-building-me-a-coding-agent Tue, 31 Mar 2026 08:00:00 GMT Dan Vega Spring AI Spring Boot Java Most AI agents can search the web. But what happens when they need to actually use it? I built a Spring Boot Starter for Browserbase that gives your agents a real, headless browser in three lines of configuration, plus a deep research agent to show it off. https://www.danvega.dev/blog/browserbase-spring-boot-starter https://www.danvega.dev/blog/browserbase-spring-boot-starter Wed, 25 Mar 2026 08:00:00 GMT Dan Vega Spring Boot Spring AI JDK 26 introduces JEP 500, which warns developers when final fields are mutated through reflection. Here's what this means for your Java code and how to prepare for the future. https://www.danvega.dev/blog/jdk-26-final-means-final https://www.danvega.dev/blog/jdk-26-final-means-final Fri, 20 Mar 2026 10:00:00 GMT Dan Vega Java How I built a terminal user interface for the Spring Initializr using Tambu UI, a new Java TUI framework, and GraalVM native images to streamline my development workflow. https://www.danvega.dev/blog/spring-initializr-tui https://www.danvega.dev/blog/spring-initializr-tui Sat, 14 Mar 2026 10:00:00 GMT Dan Vega Java Spring Boot https://www.danvega.dev/blog/spring-ai-prompt-caching https://www.danvega.dev/blog/spring-ai-prompt-caching Sun, 08 Feb 2026 09:00:00 GMT Dan Vega Spring AI OpenAI released Codex, a new GUI for their coding agent. I put it to the test by building a vending machine CLI application in Java 25 with Maven, JUnit 6, and JSpecify null safety annotations. https://www.danvega.dev/blog/openai-codex-first-look https://www.danvega.dev/blog/openai-codex-first-look Thu, 05 Feb 2026 09:00:00 GMT Dan Vega Java AI Learn how to use the new spring-boot-starter-opentelemetry in Spring Boot 4 to add observability with traces, metrics, and logs—no Actuator required. https://www.danvega.dev/blog/opentelemetry-spring-boot https://www.danvega.dev/blog/opentelemetry-spring-boot Tue, 23 Dec 2025 09:00:00 GMT Dan Vega Spring Boot Observability Learn how to build a REST API with Spring Boot 4 in minutes. This tutorial shows you how to create CRUD endpoints using Java records and the @RestController annotation. https://www.danvega.dev/blog/spring-boot-4-rest-api https://www.danvega.dev/blog/spring-boot-4-rest-api Thu, 18 Dec 2025 09:00:00 GMT Dan Vega Spring Boot Java REST API Learn how to load resources in Spring Boot using the Resource interface. This tutorial covers three approaches for loading files from the classpath, filesystem, and URLs. https://www.danvega.dev/blog/loading-spring-resources https://www.danvega.dev/blog/loading-spring-resources Wed, 17 Dec 2025 09:00:00 GMT Dan Vega Spring Boot Spring Framework Learn how to implement multi-factor authentication (MFA) in Spring Boot 4 using Spring Security 7's new @EnableMultiFactorAuthentication annotation. Step-by-step tutorial with one-time token login and custom PIN codes. https://www.danvega.dev/blog/spring-security-7-multi-factor-authentication https://www.danvega.dev/blog/spring-security-7-multi-factor-authentication Tue, 16 Dec 2025 09:00:00 GMT Dan Vega Spring Boot Spring Security Upgraded to Spring Boot 4 and features stopped working? Learn how the new modular auto-configuration architecture affects your migration and how to fix common issues like the H2 console not appearing. https://www.danvega.dev/blog/spring-boot-4-modularization https://www.danvega.dev/blog/spring-boot-4-modularization Fri, 12 Dec 2025 09:00:00 GMT Dan Vega Spring Boot Spring Boot 4 Java A comparison of MockMvcTester and RestTestClient for testing Spring Boot web applications, exploring when to use each approach and their key differences. https://www.danvega.dev/blog/mock-vs-rest https://www.danvega.dev/blog/mock-vs-rest Wed, 10 Dec 2025 09:00:00 GMT Dan Vega Spring Boot Master the Spring JMS Client with this complete Spring Boot 4 JmsClient tutorial. Learn when to choose JMS over Kafka, configure message conversion, and send messages using Spring's fluent API. https://www.danvega.dev/blog/jms-client https://www.danvega.dev/blog/jms-client Fri, 05 Dec 2025 09:00:00 GMT Dan Vega Java Spring Boot JMS Learn how Spring Data AOT Repositories move query processing from runtime to compile time, reducing startup times and memory usage, plus how to validate repository methods at build time. https://www.danvega.dev/blog/spring-data-aot-repositories https://www.danvega.dev/blog/spring-data-aot-repositories Tue, 25 Nov 2025 10:00:00 GMT Dan Vega Spring Boot Spring Data A comprehensive look at the new features in Spring Framework 7 and Spring Boot 4, including code examples and resources to help you get started https://www.danvega.dev/blog/spring-boot-4-is-here https://www.danvega.dev/blog/spring-boot-4-is-here Mon, 24 Nov 2025 09:00:00 GMT Dan Vega Spring Boot Spring Java Spring Boot 4 includes native retry support with @Retryable, RetryTemplate, and @ConcurrencyLimit. Learn how to add resilience without the spring-retry dependency. https://www.danvega.dev/blog/spring-boot-4-native-retry-support https://www.danvega.dev/blog/spring-boot-4-native-retry-support Thu, 13 Nov 2025 09:00:00 GMT Dan Vega Spring Boot Spring Boot 4 Java Learn how to use Jackson 3 in Spring Boot 4 with the new JsonMapper, immutable configuration, unchecked exceptions, and JSON Views with the hint() method. https://www.danvega.dev/blog/jackson-3-spring-boot-4 https://www.danvega.dev/blog/jackson-3-spring-boot-4 Mon, 10 Nov 2025 09:00:00 GMT Dan Vega Spring Boot Spring Boot 4 Learn how HTTP interfaces let you define declarative HTTP clients in Spring Boot, and discover how Spring Framework 7 eliminates the configuration boilerplate with @ImportHttpServices. https://www.danvega.dev/blog/http-interfaces-spring-boot-4 https://www.danvega.dev/blog/http-interfaces-spring-boot-4 Thu, 06 Nov 2025 09:00:00 GMT Dan Vega Spring Boot Spring Boot 4 Spring Framework Discover how Spring Boot 4 and JSpecify annotations catch NullPointerExceptions at compile-time instead of runtime. Learn to implement @NullMarked and @Nullable for bulletproof Java code with practical examples. https://www.danvega.dev/blog/spring-boot-4-null-safety https://www.danvega.dev/blog/spring-boot-4-null-safety Wed, 05 Nov 2025 09:00:00 GMT Dan Vega Java Spring Boot Spring Boot 4 Learn how Spring Boot 4's new BeanRegistrar interface simplifies programmatic bean registration in Spring Framework 7. This tutorial demonstrates dynamic bean creation based on environment properties, conditional registration with complex logic, and performance optimization techniques. Discover when to use BeanRegistrar vs @Bean annotations with practical code examples and testing strategies for your Spring applications. https://www.danvega.dev/blog/programmatic-bean-registration https://www.danvega.dev/blog/programmatic-bean-registration Sat, 01 Nov 2025 09:00:00 GMT Dan Vega Spring Boot Spring Boot 4 Spring Framework Explore the new Rest Test Client in Spring Framework 7, a modern replacement for RestTemplate that provides a fluent API for testing REST APIs with improved type safety and better integration with modern testing practices. https://www.danvega.dev/blog/spring-framework-7-rest-test-client https://www.danvega.dev/blog/spring-framework-7-rest-test-client Thu, 30 Oct 2025 09:00:00 GMT Dan Vega Spring Framework Spring Boot Testing Learn how to build MCP (Model Context Protocol) clients using Spring AI to augment Large Language Models with custom context and functionality for your applications. https://www.danvega.dev/blog/spring-ai-mcp-client https://www.danvega.dev/blog/spring-ai-mcp-client Tue, 28 Oct 2025 09:00:00 GMT Dan Vega Spring AI Explore modern approaches to API versioning in GraphQL, including schema evolution strategies, deprecation patterns, and best practices for maintaining backward compatibility while evolving your API. https://www.danvega.dev/blog/api-versioning-with-graphql https://www.danvega.dev/blog/api-versioning-with-graphql Tue, 30 Sep 2025 09:00:00 GMT Dan Vega Spring Boot GraphQL Learn how to implement API versioning strategies in Spring Boot 4 applications, including best practices for managing backwards compatibility and evolution of your REST APIs. https://www.danvega.dev/blog/spring-boot-4-api-versioning https://www.danvega.dev/blog/spring-boot-4-api-versioning Thu, 25 Sep 2025 09:00:00 GMT Dan Vega Spring Boot Spring Boot 4 Spring Framework Learn how Spring AI 1.1.0-M2 makes building MCP servers in Java incredibly simple with just annotations. No callbacks, no complex setup. Includes complete code from my Commit Your Code 2025 conference demo, showing how to expose your Java application's data to Claude and other AI assistants. https://www.danvega.dev/blog/cyc-mcp-server-spring-ai https://www.danvega.dev/blog/cyc-mcp-server-spring-ai Wed, 24 Sep 2025 09:00:00 GMT Dan Vega Spring Spring AI AI MCP Java Explore the transformative features introduced in Spring Boot 3.0 through 3.5, from Java 17 requirements and GraalVM native images to virtual threads and enhanced observability. This comprehensive guide covers each release's major improvements, including Docker Compose integration, Testcontainers support, structured logging, and SSL certificate management. Learn how Spring Boot 3.x revolutionized Java application development with practical code examples and migration tips for upgrading from 2.x to 3.x. https://www.danvega.dev/blog/spring-boot-3-features https://www.danvega.dev/blog/spring-boot-3-features Wed, 17 Sep 2025 09:00:00 GMT Dan Vega Spring Boot Java Spring Framework Discover JDK 24's breakthrough enhancement that eliminates virtual thread pinning with synchronized blocks and methods. This comprehensive guide explores how this change revolutionizes Java concurrency, dramatically improving scalability for Spring Boot applications with legacy synchronized code. You'll learn about the technical details of thread pinning, see practical performance comparisons, and get hands-on examples showing how to leverage this feature in real-world applications for maximum throughput and efficiency. https://www.danvega.dev/blog/jdk-24-virtual-threads-without-pinning https://www.danvega.dev/blog/jdk-24-virtual-threads-without-pinning Wed, 09 Apr 2025 17:00:00 GMT Dan Vega Java Spring Master Docker Desktop's revolutionary Model Runner feature and discover how to build privacy-first AI applications with Spring Boot. This complete tutorial shows you how to run powerful open-source AI models like Gemma locally on your machine, eliminating API costs, protecting sensitive data, and simplifying development workflows. You'll get step-by-step instructions for setting up local AI models, integrating with Spring AI, and building production-ready applications that respect privacy while delivering exceptional AI capabilities without monthly subscription fees. https://www.danvega.dev/blog/docker-model-runner https://www.danvega.dev/blog/docker-model-runner Mon, 07 Apr 2025 17:00:00 GMT Dan Vega Spring AI Build powerful AI integrations by creating your own Model Context Protocol (MCP) server using Spring Boot and Spring AI. This comprehensive guide walks you through implementing a custom MCP server from scratch, enabling AI models like Claude to access your private data sources, execute specialized business logic, and interact with your custom services. You'll learn the MCP architecture, implement tool functions, handle data retrieval, and deploy a production-ready server that seamlessly extends AI capabilities with your organization's unique data and workflows. https://www.danvega.dev/blog/creating-your-first-mcp-server-java https://www.danvega.dev/blog/creating-your-first-mcp-server-java Wed, 26 Mar 2025 17:00:00 GMT Dan Vega Java Spring MCP Discover how the new Stream Gatherers feature in JDK 24 provides a more elegant solution for processing blog content compared to traditional stream operations. https://www.danvega.dev/blog/stream-gatherers https://www.danvega.dev/blog/stream-gatherers Fri, 21 Mar 2025 09:00:00 GMT Dan Vega Java Learn how Model Context Protocol (MCP) enables LLMs to access external data sources and tools, with practical implementation guides for getting started today. https://www.danvega.dev/blog/model-context-protocol-introduction https://www.danvega.dev/blog/model-context-protocol-introduction Tue, 11 Mar 2025 17:00:00 GMT Dan Vega Spring AI MCP Recently, I had the pleasure of presenting on a topic that I'm pretty passionate about: how artificial intelligence can amplify developer productivity and creativity. https://www.danvega.dev/blog/ai-powered-dev-hacks-confoo-2025 https://www.danvega.dev/blog/ai-powered-dev-hacks-confoo-2025 Thu, 27 Feb 2025 09:00:00 GMT Dan Vega AI Learn how to build flexible and maintainable GraphQL APIs using Spring Boot's Query by Example support, reducing boilerplate code while enabling powerful search capabilities. https://www.danvega.dev/blog/spring-boot-graphql-query-by-example https://www.danvega.dev/blog/spring-boot-graphql-query-by-example Mon, 02 Dec 2024 09:00:00 GMT Dan Vega GraphQL Spring Boot A detailed exploration of why Java developers should reconsider using Project Lombok, examining its drawbacks and modern alternatives in Java development. https://www.danvega.dev/blog/no-lombok https://www.danvega.dev/blog/no-lombok Mon, 11 Nov 2024 09:00:00 GMT Dan Vega Java Learn how to simplify your Spring Data JPA queries using Query By Example (QBE) and create dynamic, type-safe queries without the boilerplate code. https://www.danvega.dev/blog/spring-data-jpa-query-by-example https://www.danvega.dev/blog/spring-data-jpa-query-by-example Fri, 08 Nov 2024 17:00:00 GMT Dan Vega Spring Boot Spring Data Learn how to implement OAuth2 authentication in your Spring applications using the new RestClient OAuth2 support in Spring Security 6.4. This guide covers architecture, implementation, and best practices for secure service-to-service communication. https://www.danvega.dev/blog/rest-client-oauth2-support https://www.danvega.dev/blog/rest-client-oauth2-support Tue, 05 Nov 2024 17:00:00 GMT Dan Vega Spring Boot Spring Security Learn how to track and manage token usage in Spring AI applications, including implementing custom response types and automated logging with AOP. https://www.danvega.dev/blog/spring-ai-tokens https://www.danvega.dev/blog/spring-ai-tokens Fri, 01 Nov 2024 17:00:00 GMT Dan Vega Spring AI Learn how to implement clean and efficient request/response logging for Spring Boot's Rest Client, including both inline and interceptor-based approaches. https://www.danvega.dev/blog/spring-boot-rest-client-logging https://www.danvega.dev/blog/spring-boot-rest-client-logging Thu, 31 Oct 2024 09:00:00 GMT Dan Vega Spring Boot Rest Client Learn how to effectively manage configuration and secure sensitive data using environment variables in Spring Boot applications. This comprehensive guide covers best practices, security considerations, and practical examples. https://www.danvega.dev/blog/spring-boot-environment-variables https://www.danvega.dev/blog/spring-boot-environment-variables Tue, 29 Oct 2024 17:00:00 GMT Dan Vega Spring Boot Learn how to create a secure login form using Spring Security and JTE (Java Template Engine) with support for both traditional authentication and OAuth2 providers. https://www.danvega.dev/blog/spring-boot-oauth-demo https://www.danvega.dev/blog/spring-boot-oauth-demo Thu, 24 Oct 2024 17:00:00 GMT Dan Vega Spring Boot Spring Security Learn how to build intelligent applications using Retrieval Augmented Generation (RAG) with Spring AI. This practical guide covers everything from understanding tokens and context windows to implementing a full RAG solution. https://www.danvega.dev/blog/getting-started-with-spring-ai-rag https://www.danvega.dev/blog/getting-started-with-spring-ai-rag Tue, 22 Oct 2024 09:00:00 GMT Dan Vega spring spring-ai java Explore how Java developers can leverage generative AI, from basic curl commands to robust Spring Boot applications. Learn to integrate OpenAI's GPT models, use Java's HTTP client, and harness the power of Spring AI for structured output and simplified AI integration. https://www.danvega.dev/blog/ai-java-developers https://www.danvega.dev/blog/ai-java-developers Tue, 15 Oct 2024 09:00:00 GMT Dan Vega Java Spring Boot AI Learn how to integrate and call multiple Large Language Models (LLMs) like OpenAI's GPT-4 and Anthropic's Claude in a single Spring Boot application using Spring AI. This tutorial covers project setup, configuration, and implementation of separate controllers for each LLM. https://www.danvega.dev/blog/spring-ai-multiple-llms https://www.danvega.dev/blog/spring-ai-multiple-llms Mon, 14 Oct 2024 09:00:00 GMT Dan Vega Spring Boot Java Spring AI Learn how to create a context-aware chatbot using Spring AI and OpenAI. This tutorial covers implementing chat memory, handling token usage, and managing context window limitations for more engaging AI conversations. https://www.danvega.dev/blog/spring-ai-chat-memory https://www.danvega.dev/blog/spring-ai-chat-memory Fri, 11 Oct 2024 09:00:00 GMT Dan Vega Spring Boot Java Spring AI~~ Learn how to create a responsive and engaging chat bot using Spring Boot and Spring AI, featuring both traditional and streaming response capabilities for an enhanced user experience. https://www.danvega.dev/blog/spring-ai-streaming-chatbot https://www.danvega.dev/blog/spring-ai-streaming-chatbot Tue, 08 Oct 2024 20:00:00 GMT Dan Vega Spring Boot Java Spring AI Learn how to create interactive web forms using Spring Boot and Java Template Engine (JTE) in this comprehensive tutorial. https://www.danvega.dev/blog/jte-forms https://www.danvega.dev/blog/jte-forms Mon, 07 Oct 2024 20:00:00 GMT Dan Vega Spring Boot Java Learn how to build a dynamic Task manager using Spring Boot, Java Template Engine (JTE), HTMX and Tailwind CSS. https://www.danvega.dev/blog/spring-boot-jte-htmx https://www.danvega.dev/blog/spring-boot-jte-htmx Sun, 06 Oct 2024 20:00:00 GMT Dan Vega Spring Boot Java