Personal site of Dan Vega https://www.danvega.dev en-us Wed, 15 Jul 2026 15:10:16 GMT danvega@gmail.com (Dan Vega) danvega@gmail.com (Dan Vega) Can you use Java for AI? Yes. For building real AI applications it might be the better choice. Why the JVM, Spring AI, and your existing team are enough. https://www.danvega.dev/blog/can-you-use-java-for-ai https://www.danvega.dev/blog/can-you-use-java-for-ai Wed, 15 Jul 2026 09:00:00 GMT Dan Vega Java AI Spring AI Spring Boot 3.5 reached end of life in June 2026 and every 3.x branch is now unsupported. What that means, and how to plan your Spring Boot 4 upgrade. https://www.danvega.dev/blog/spring-boot-end-of-life https://www.danvega.dev/blog/spring-boot-end-of-life Tue, 14 Jul 2026 13:00:00 GMT Dan Vega Spring Boot Java Spring Boot 4 AI Port 8080 already in use? Learn how to find and kill the process running on a port on Windows, macOS, and Linux—with copy-paste commands for each. https://www.danvega.dev/blog/kill-process-on-port https://www.danvega.dev/blog/kill-process-on-port Tue, 14 Jul 2026 09:00:00 GMT Dan Vega Java Spring Boot Spring AI 2.0's tool search brings dynamic tool discovery to Spring Boot—load tools on demand instead of into every request to cut token usage and cost. https://www.danvega.dev/blog/spring-ai-tool-search https://www.danvega.dev/blog/spring-ai-tool-search Thu, 09 Jul 2026 09:00:00 GMT Dan Vega Spring AI Spring Boot Learn to build custom Spring AI advisors with the BaseAdvisor interface to log available tools, track tool invocations, and count token usage on every LLM call. https://www.danvega.dev/blog/spring-ai-custom-advisors-tool-logging-token-counter https://www.danvega.dev/blog/spring-ai-custom-advisors-tool-logging-token-counter Wed, 08 Jul 2026 09:00:00 GMT Dan Vega Spring AI Spring Boot Java UI.sh is a collection of agent skills from the Tailwind CSS and Refactoring UI team that give Claude Code and Codex the polish of a senior UI designer. https://www.danvega.dev/blog/ui-dot-sh-agent-skills-for-building-beautiful-uis https://www.danvega.dev/blog/ui-dot-sh-agent-skills-for-building-beautiful-uis Tue, 07 Jul 2026 09:00:00 GMT Dan Vega AI Tailwind CSS Spring AI gives you two ways to call an LLM. Learn the difference between ChatClient and ChatModel, when to use each, and see both in action with code examples. https://www.danvega.dev/blog/chatclient-vs-chatmodel-spring-ai https://www.danvega.dev/blog/chatclient-vs-chatmodel-spring-ai Thu, 02 Jul 2026 09:00:00 GMT Dan Vega Spring AI Spring Boot X released MCP servers for its API and docs. Build a Spring Boot MCP client with Spring AI 2.0 to search X posts and query the X API docs programmatically. https://www.danvega.dev/blog/x-twitter-mcp-servers-spring-ai https://www.danvega.dev/blog/x-twitter-mcp-servers-spring-ai Wed, 01 Jul 2026 09:00:00 GMT Dan Vega Spring AI MCP Spring Boot Spring Boot 4.1 adds type-safe property paths to Spring Data, replacing stringly typed references in sorting, criteria queries, and composite paths. https://www.danvega.dev/blog/type-safe-property-paths-spring-boot-4-1 https://www.danvega.dev/blog/type-safe-property-paths-spring-boot-4-1 Tue, 30 Jun 2026 09:00:00 GMT Dan Vega Spring Boot Spring Data Spring Boot 4.1 adds @RedisListener, one annotation that brings Redis Pub/Sub in line with @KafkaListener and @RabbitListener. No container wiring needed. https://www.danvega.dev/blog/redis-listener-spring-boot-4-1 https://www.danvega.dev/blog/redis-listener-spring-boot-4-1 Mon, 29 Jun 2026 09:00:00 GMT Dan Vega Spring Boot Redis Learn how Spring Boot 4.1's new InetAddressFilter protects your applications against Server-Side Request Forgery (SSRF) attacks with a single bean definition. https://www.danvega.dev/blog/spring-boot-ssrf-protection-inet-address-filter https://www.danvega.dev/blog/spring-boot-ssrf-protection-inet-address-filter Fri, 26 Jun 2026 09:00:00 GMT Dan Vega Spring Boot Java Spring Boot 4.1 adds lazy JDBC connection fetching via spring.datasource.connection-fetch. See how it cuts connection hold time from 2 seconds to 15ms. https://www.danvega.dev/blog/lazy-jdbc-connections-spring-boot-4-1 https://www.danvega.dev/blog/lazy-jdbc-connections-spring-boot-4-1 Thu, 25 Jun 2026 09:00:00 GMT Dan Vega Spring Boot Spring Data Build a gRPC server and client in Spring Boot 4.1 with Spring gRPC — using @GrpcService, protobuf, and the new starters from start.spring.io. https://www.danvega.dev/blog/spring-grpc-spring-boot-4-1 https://www.danvega.dev/blog/spring-grpc-spring-boot-4-1 Wed, 24 Jun 2026 09:00:00 GMT Dan Vega Learn how to externalize Spring Modulith application events to Apache Kafka so other systems can react to changes happening inside your modular monolith. https://www.danvega.dev/blog/spring-modulith-externalized-events https://www.danvega.dev/blog/spring-modulith-externalized-events Wed, 20 May 2026 09:00:00 GMT Dan Vega Spring Modulith Produce and consume your first Apache Kafka message with Spring Boot. Covers Docker Compose, KafkaTemplate, @KafkaListener, and Embedded Kafka for tests. https://www.danvega.dev/blog/spring-boot-kafka-quick-start https://www.danvega.dev/blog/spring-boot-kafka-quick-start Mon, 18 May 2026 08:00:00 GMT Dan Vega Spring Boot Apache Kafka Spring for Apache Kafka Learn how Spring Modulith's event publication registry persists and replays failed events across restarts, giving you a transactional outbox with no message broker. https://www.danvega.dev/blog/spring-modulith-durable-events https://www.danvega.dev/blog/spring-modulith-durable-events Thu, 14 May 2026 09:00:00 GMT Dan Vega Spring Boot Spring Modulith Learn how Spring Modulith helps you build a modular monolith in Spring Boot with enforced module boundaries, application events, and verified architecture. https://www.danvega.dev/blog/introduction-to-spring-modulith https://www.danvega.dev/blog/introduction-to-spring-modulith Thu, 30 Apr 2026 09:00:00 GMT Dan Vega Spring Boot Spring Modulith Java Modular Monolith Add tools and MCP servers to your Embabel agents in Java. Build a blog writing agent that researches topics, calculates reading time, and generates 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, Rod Johnson's framework for building agentic AI flows on the JVM. Build a blog writing agent using goal-oriented action planning (GOAP). 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 Build GraphQL APIs in Java with Spring Boot 4 and Spring for GraphQL. A free course covering schema-first design, batch loading, unions, and AOT repositories. 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 Build an autonomous coding agent in Spring AI with the Spring AI Agent Utils library. This tutorial adds file system tools, shell commands, and agent 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 AI Agent Search https://www.danvega.dev/blog/spring-ai-deep-research-agent https://www.danvega.dev/blog/spring-ai-deep-research-agent Fri, 27 Mar 2026 09:00:00 GMT Dan Vega AI Learn best practices for error handling with Spring's RestClient, including global exception handlers, custom exceptions, Problem Detail responses, and built-in retry with resilience methods in Spring Framework 7. https://www.danvega.dev/blog/rest-client-error-handling https://www.danvega.dev/blog/rest-client-error-handling Thu, 26 Mar 2026 09:00:00 GMT Dan Vega Spring Boot Spring Framework REST Client 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 Spring AI prompt caching cuts your Anthropic Claude API costs. Use AnthropicCacheStrategy to cache system prompts and tools that don't change between requests. 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 The Ralph Loop is a bash script that runs your AI coding agent with a fresh context every iteration. Here's how it works and how I used it to build a Java CLI. https://www.danvega.dev/blog/ralph-loop https://www.danvega.dev/blog/ralph-loop Thu, 05 Feb 2026 09:00:00 GMT Dan Vega AI Java 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 Spring Boot 4 broke your auto-configuration? Learn which modular starters you now need—Flyway, H2, and the test starters behind @AutoConfigureMockMvc. 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 Everything new in Spring Boot 4 and 4.1, from null safety and HTTP interfaces to modularization and gRPC, plus the upgrade path from Spring Boot 3. 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 Boot 4 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 Every major Spring Boot 3.x feature from 3.0 to 3.5—Java 17, GraalVM native images, virtual threads, Docker Compose, Testcontainers, and structured logging. 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