Advanced and Dynamic Searching With Spring Data JPA

From the classic Specification API to the new PredicateSpecification in Spring Data 4.0, generic search criteria builders, Querydsl integration, and pagination — everything your…

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Why Your Integration Tests Are Slower Than They Should Be: The Spring Context Cache You Don’t Know You’re Misusing

Every JCG article recommends @SpringBootTest for integration testing. Almost none explain the context cache model underneath it — how a single misplaced @DirtiesContext,…

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Spring AI: Testing MCP Tools

Testing Model Context Protocol (MCP) tools in Spring AI is essential to ensure that tools are correctly registered, discoverable, and…

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HTMX in a Java World: Building Hypermedia APIswith Spring Boot and Thymeleaf

Tired of wiring up React for a search box? HTMX gives your Thymeleaf templates superpowers — live search, inline edits,…

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Building Read-Write Database Routing in Spring Boot with JPA

Enterprise applications often require the separation of database workloads to improve performance and scalability. Read operations can be directed to…

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Running Parallel Instances of Spring Boot Applications in IntelliJ

Running multiple instances of a Spring Boot application can be beneficial for testing interactions, configurations, and resilience patterns. With IntelliJ…

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Spring Boot 404 Redirect to Single Page Application

Single-page application (SPA) such as those built with React, Angular, or Vue handle routing on the client side. When deployed…

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Spring Boot 4 vs. 3: What Actually Changed

The migration guides list dozens of changes. Most articles rehash the changelog. This piece focuses on the three changes that…

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OpenRewrite: The Automated Migration Tool That’s Quietly Changing How Teams Upgrade Java

It started at Netflix, migrated the Jakarta EE TCK, and is now the dominant automation tool for Java modernization according…

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