Former senior programmer at a Fortune Global 500 company, dedicated to sharing Java expertise. Visit Feng's site: Java Knowledge Sharing, www.java1234.com
CodeGraph builds a local knowledge graph of a codebase, letting AI assistants query a SQLite index instead of grepping files, which cuts tool calls by up to 89%, reduces token usage by around 70%, and keeps all code private, explaining its rapid rise in popularity.
Apache PDFBox, an open‑source Java library under the Apache 2.0 license, lets developers create, read, modify, and extract data from PDFs, offering extensive features, command‑line tools, and seamless Maven integration, which explains its growing adoption in Java‑based backend and enterprise projects.
Spring 7 doesn’t remove Feign from the classpath but officially discourages its use, labeling OpenFeign as feature‑complete and recommending the new Spring Framework HTTP Service Client, with a detailed comparison, migration steps, and guidance on when Feign may still be viable.
FastCode, an open‑source framework from HKU’s DS team, builds semantic maps and structural graphs of codebases to let AI assistants answer queries up to four times faster, cut token usage by up to 44 %, and achieve higher accuracy across benchmarks, supporting multiple languages and deployment options.
The article explains why floating‑point types are unsafe for monetary values, compares the Long‑in‑cents and BigDecimal‑in‑yuan approaches, lists their advantages and drawbacks, and provides concrete Java code, database schemas, layer‑boundary conversion patterns, and common pitfalls.
Quarkus, Red Hat's cloud‑native Java framework, achieves dramatically faster startup (0.3‑1 s vs 2‑5 s) and roughly half the memory usage (150‑200 MB vs 300‑500 MB) by moving many optimizations to compile time, and offers a Spring‑like developer experience with extensions, reactive support, and hot‑reload tooling.
The article explains that OpenJDK is the open‑source reference implementation while Oracle JDK is Oracle’s distribution built on it, outlines their minimal functional differences after Java 11, compares licensing, update policies and commercial support, shows how to identify the installed JDK, and offers practical selection guidance for students, enterprises and production environments.
The article introduces shadcn/ui, an open‑source UI library that copies component source code into your project via a CLI, highlighting its visible, modifiable, maintainable, and AI‑friendly design, and walks through its core principles, tech stack, and quick‑start usage.
Maven 4 (currently at 4.0.0‑rc‑5) introduces a Java 17 runtime requirement, separates Build POM from Consumer POM, adds a new POM 4.1.0 model that reduces repetitive configuration, and provides migration tools such as mvnup and mvnsh, while offering step‑by‑step guidance for upgrading from Maven 3.
The article shares nine hands‑on tips for building Spring AI 2.0 agents—including using ChatClient as the entry point, delegating tool calls to ToolCallingAdvisor, defining tools with @Tool, crafting effective system prompts, leveraging Advisor chains, streaming responses early, managing conversation memory, limiting tool count, and adding observability—each illustrated with concrete code snippets.
