Data Processing in GCP With Apache Airflow and BigQuery

Modern data engineering rarely lives on a single machine. As datasets grow from gigabytes into terabytes — and sometimes into…

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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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Getting Started with WebDriverManager

Selenium WebDriver is a widely used framework for browser automation, but managing browser drivers manually can be time-consuming and error-prone…

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Spring AI 2.0 + MCP: Building a Tool-Calling Agent in 50 Lines

Spring AI 2.0-M6, shipped May 8, 2026, is the milestone where building an MCP tool-calling agent in Java stops feeling…

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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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Database Indexing Mistakes That Senior Java Developers Still Make in 2026: A Deep Dive With PostgreSQL and Hibernate

You’ve shipped dozens of services. You know what a B-tree is. Yet your PostgreSQL queries are still crawling at 3…

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String Deduplication Is On By Default in G1 — And Most Developers Don’t Know What It Does

A granular look at what the JVM is quietly doing with your strings at the native level, when that work…

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The Database Migration Risk That Hibernate Silently Creates

Why hbm2ddl.auto=update is still in production codebases — and what to do about it Somewhere in a production codebase right now, Hibernate…

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Understanding OAuth 2.0 Token Exchange

In modern software architectures, especially microservices-based systems, authentication is no longer a simple “login once, use everywhere” problem. A single…

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