This article analyzes MyBatis-Plus Pro, a framework that extends MyBatis-Plus by providing a BaseController to auto-generate CRUD APIs, detailing its architecture, reflection-based query wrapper generation, pros/cons, ideal use cases, and best practices for avoiding common pitfalls.
This article explains why Spring Boot's @Scheduled annotation executes on every instance in a clustered deployment, causing duplicate tasks like coupon issuance, and demonstrates solutions using ShedLock distributed locks and business-level idempotency keys to ensure exactly-once execution.
This article details integrating Timefold Solver with Spring Boot to tackle NP-hard optimization problems like employee scheduling and vehicle routing, covering domain modeling, constraint streams, incremental solving, score types, REST APIs, tuning strategies, production validation, and real-world pitfalls with concrete code examples and a 230-employee case study.
The author describes how exporting 500k order records caused a 2GB heap OOM, then fixed it by replacing XSSFWorkbook with streaming SXSSFWorkbook, switching from full entity loading to cursor-based batch queries with DTOs, reusing cell styles, and finally decoupling large exports from HTTP requests via async task processing.
This article dissects OnlyOffice DocumentServer 9.4's shift to a lightweight single-process architecture, explains the document.key collaborative editing mechanism, provides a complete Spring Boot integration guide with Docker deployment, and compares OnlyOffice against Collabora Online and Microsoft 365 across compatibility, resource usage, and deployment scenarios.
The article explains why naive retries after timeouts cause duplicate orders in Spring Boot, demonstrating how to properly classify retryable exceptions, implement idempotency with stable request IDs, handle non-idempotent third-party APIs via query-before-retry, add concurrency limits with @ConcurrencyLimit, and separate concerns into Service, Gateway, and Client layers using Spring Framework 7's @Retryable.
This article walks through designing a clean, unified API response format with categorized error codes, then shows how to automate response wrapping in Spring Boot using a custom @ResponseResult annotation, a handler interceptor, and ResponseBodyAdvice so controllers return plain domain objects while the framework handles consistent JSON serialization.
This article details integrating Spring Boot 3.x with Active Directory/LDAP for unified authentication, covering directory model concepts, connection pooling, custom authentication providers, group-to-role mapping, JWT/OIDC/MFA integration, testing strategies, and critical production pitfalls like connection leaks, timeout misconfiguration, nested group performance, and certificate issues.
This article demonstrates how to implement a correct waitlist auto-promotion system for limited-capacity events using Spring Boot, MySQL InnoDB row locks, and database transactions to atomically handle cancellations and promotions without race conditions, ensuring the first waitlisted user always gets the freed spot.
This article analyzes OnlyOffice DocumentServer 9.4's lightweight mode, detailing its single-process architecture, document.key versioning mechanism, Spring Boot integration code examples, and a comparison with Collabora Online and Microsoft 365 for self-hosted document editing scenarios.
This article details practical integration of jOOQ 3.19 with Spring Boot 3.x for type-safe SQL, covering code generation, DSL queries, multi-database adaptation, performance tuning, security practices, and migration lessons learned from real-world complex reporting and multi-database delivery scenarios.
MateClaw is an open-source, self-hosted AI workbench that deploys via a single Docker command, providing digital employees with roles, knowledge bases, and tool permissions, team collaboration via DAG task graphs, a traceable wiki-style knowledge base with page-level citations, model failover across 14+ providers, and enterprise-grade RBAC, audit logs, and approval workflows — all in a Java 21 Spring Boot stack.
A comprehensive guide to integrating Apache Ignite 2.16.x with Spring Boot 3.x, covering distributed caching, SQL querying, affinity collocation, compute grid patterns, native persistence, high-availability configurations, and performance tuning for production deployments.
This article demonstrates how to prevent race conditions between order timeout closure and payment callbacks using atomic conditional UPDATE statements and SELECT FOR UPDATE with a refund outbox pattern, ensuring either payment wins and order becomes PAID, or closure wins and late payments trigger automatic refund compensation.
This guide covers integrating Spring Boot with Apache CXF to publish and consume SOAP web services, detailing WSDL-first vs code-first approaches, endpoint configuration, client invocation patterns, WS-Security (username tokens, signatures, encryption), MTOM attachments, message validation, exception handling, testing strategies, and production hardening against XXE, large payloads, and version conflicts.
The article demonstrates how Spring Boot 4.1's new InetAddressFilter.externalAddresses() simplifies SSRF protection for user-supplied URLs, replacing manual IP checks with a centralized HTTP client filter, while also covering URL validation, redirect handling, timeouts, response size limits, and testing strategies to secure link preview and similar features.
This article details the evolution of a Spring Boot daily sign-in system from 10K to 100M users, covering Redis bitmap sharding, Lua atomic operations, command outbox pattern, Kafka async reward processing, idempotency guarantees, fault tolerance strategies, and production-grade observability with real incident postmortems.
This guide covers integrating Cassandra with Spring Boot for high-write scenarios, detailing data modeling with partition/clustering keys, consistency level selection (LOCAL_QUORUM), query best practices, performance tuning (compaction, compression, JVM), and production pitfalls like hot partitions and tombstone storms.
This guide demonstrates integrating Passkey/WebAuthn authentication into a Spring Boot application using Spring Security 7.1's built-in support, covering dependency setup, security configuration, frontend JavaScript implementation for credential registration and authentication, database persistence with JDBC repositories, and a migration strategy that retains password login while adding Passkey as a second factor.
This article demonstrates how ValidX, a JSR-380-compliant validation library with 100+ Chinese business validators, integrates into DDD layered architecture, showing annotation-based DTO validation, chain-style API for value objects, aggregate roots, and domain services, with code examples for each layer and best practices for avoiding common pitfalls.
This article details a production-ready QR code login implementation using Spring Boot, covering state machine design with Redis and Lua for atomic transitions, SSE for low-latency status push with polling fallback, HMAC-SHA256 with nonce for replay protection, and Redis Pub/Sub for cross-instance consistency in clustered deployments.
The article demonstrates why distributed locks alone fail to guarantee idempotency in Spring Boot order APIs, and presents a three-layer solution combining Idempotency-Key with request fingerprinting, Redis SET NX for fast duplicate interception, and a database unique constraint as the ultimate safeguard against duplicate orders even after crashes or Redis failures.
Lithe is an open-source lightweight IDE for Java and Spring Boot development that complements AI coding tools, offering project navigation, run/debug, Git diff, and database tools with ~300-400MB memory usage, auto-detected run configurations, and AI-generated commit messages.
This guide walks through configuring a Redis vector database with Spring AI, adding the vector store advisor for retrieval-augmented generation, ingesting documents via ETL pipelines, and testing the RAG flow with a sample conversation.
This article details how default Spring Boot Tomcat settings (maxThreads=200) cap throughput at ~4K QPS despite low CPU, and demonstrates step-by-step tuning of thread pool, connection limits, and Keep-Alive parameters using Little's Law and load testing to achieve 10K+ QPS with 800 threads and proper monitoring.
Jev, a non-autoregressive 'System One' model from TypeSafe AI, replaces token-by-token text generation with parallel hidden-state scoring to deliver 70–500 ms latency and 40–400× cost savings for classification, routing, and scoring tasks, while returning calibrated probabilities that enable confidence-threshold automation in Java, Python, and JavaScript ecosystems.
This article demonstrates how to implement per-endpoint dynamic field validation in Spring Boot 3.5.0 using a custom @DynamicValid annotation and HandlerMethodArgumentResolver, allowing flexible control over required, optional, and unknown fields for Map, JsonNode, or POJO parameters, with support for custom validators and integration with @Validated.
After an external system hammered a Spring Boot search endpoint causing database connection exhaustion, the author builds a distributed fixed-window rate limiter using Redis and Lua for atomicity, wraps it with an annotation-driven AOP aspect supporting user, IP, API key, and global dimensions, returns proper HTTP 429 with Retry-After, discusses fixed-window limitations versus token bucket and sliding window, and covers fail-open/fail-closed strategies for Redis outages plus monitoring metrics.
This article analyzes eight common API performance bottlenecks in Spring Boot applications, including N+1 queries, improper entity returns, missing indexes, JOIN FETCH pagination issues, in-memory filtering, deep pagination, long transactions, and caching strategies, with code examples and optimization techniques for each.
The article shows how to handle 10GB file downloads in Spring Boot by replacing in-memory byte[] loading with streaming via FileSystemResource and leveraging Spring MVC's built-in Range request support for resumable downloads, while covering security, immutability, and object storage offloading.
This article details a production-ready dual-insurance pattern for e-commerce order timeout cancellation, combining RabbitMQ delayed message queues for real-time processing with scheduled database scans as a fallback, including Spring Boot implementation code, idempotent cancellation logic, and distributed deployment considerations.
The article explains how to handle duplicate payment callbacks in Spring Boot using database unique constraints, conditional state updates, an outbox pattern for reliable event publishing, and downstream idempotency, ensuring orders are processed exactly once even if the payment platform sends repeated notifications.
This article introduces Apache Fory, a high-performance multi-language serialization framework, and demonstrates its integration with Spring Boot 3.5.0, showing up to 3x throughput improvement over Jackson in JSON benchmarks with code examples for binary, JSON, and row-format serialization.
This article details the architecture and implementation of a production-grade notification center that abstracts channel differences, uses Thymeleaf for template rendering, employs Channel/Provider abstractions for multi-vendor support, handles async execution via thread pools and message queues, and ensures reliability through persistent task tracking, exponential backoff retries, rate limiting, idempotency, and audit logging.
Archify is an AI agent skill that analyzes code repositories to produce validated, interactive architecture diagrams in five types — Architecture, Workflow, Sequence, Data Flow, and Lifecycle — with a rigorous JSON Schema and layout validation pipeline, an interactive HTML viewer supporting search, path tracing, role comparison, and Architecture Delta for PR diffing, all delivered as a single shareable HTML file.
The article details refactoring a synchronous Spring Boot Excel import that failed at 100k rows into an async task model with streaming Apache POI SAX parsing, 500-row JDBC batch inserts, row-level error isolation, and SSE real-time progress, eliminating 504 timeouts and duplicate data on retry.
The author evolves a simple Spring Boot file upload to handle 5GB files by implementing 8MB chunked uploads, resumable upload via chunk tracking, instant upload via SHA-256 deduplication, with database schema, REST API design, streaming merge, database-level concurrency control, and automated cleanup of expired uploads.
LangChain4j provides a Java-native framework for integrating 20+ LLM providers and 30+ vector stores via a unified API, declarative AiServices, RAG pipelines, tool calling, and MCP support, enabling Spring Boot teams to add AI capabilities without Python dependencies.
This article details a production-ready engineering approach for importing hundreds of thousands of Excel rows using Spring Boot and EasyExcel, covering streaming parsing, batch validation, async task isolation, idempotency, error reporting, and operational concerns like logging and temp file cleanup.
Apache Fesod (Incubating) is a high-performance, memory-efficient Java library for reading and writing Excel files, featuring streaming APIs, simple annotation-driven mapping, Spring Boot integration, and SXSSF-based large-file writing with optional temp-file compression.
A comprehensive guide to replacing RestTemplate with Spring WebClient for high-concurrency HTTP calls, covering connection pool isolation per downstream, three-layer timeout strategy, retry-with-backoff filtering, Resilience4j circuit breaker integration, ExchangeFilterFunction for logging/auth/tracing, and memory-safe streaming with backpressure.
This tutorial demonstrates how to use the Easy Random library to automatically generate realistic test data for Java objects, covering basic usage, configuration parameters, field-level customization, and custom randomizers for domain-specific values.
This tutorial walks through email protocols, third-party SMTP setup for Feishu and QQ, Spring Boot mail starter configuration, core JavaMailSender/MimeMessage/MimeMessageHelper relationships, and a complete email verification code implementation using Redis for storage and Thymeleaf for HTML templates.
This article explains how to implement Single Sign-On (SSO) using CAS to unify authentication across multiple company systems, covering session mechanics, cluster session sharing with Redis, and providing complete Spring Boot code examples for both the CAS server and client applications.
This article explains how Codex differs from typical AI chat by acting as an autonomous coding agent that can read files, modify code, run commands, and execute tests within a repository, detailing which developers benefit most and the practical limits of its capabilities.
This article demonstrates how PostgreSQL's JSONB type combined with Spring Boot provides a practical alternative to MongoDB for managing dynamic custom fields in enterprise applications, covering storage, indexing, JPA mapping, partial updates, querying patterns, and performance tuning while preserving relational integrity.
Java 27 introduces JFR in-process data redaction (JEP 536) that automatically masks sensitive values like passwords, tokens, and API keys in environment variables, system properties, and JVM arguments within flight recordings, using default glob patterns and allowing custom rules via FlightRecorderOptions, though custom JFR events and child processes remain unprotected.
This article demonstrates how to implement dynamic data source switching in Spring Boot using ThreadLocal and AbstractRoutingDataSource, covering configuration, annotation-based switching, and runtime data source registration with Druid.
This comprehensive guide covers HikariCP internals, core parameter tuning, connection leak detection, handling MySQL wait_timeout disconnections, preventing cascade failures, production-ready configuration examples, monitoring with Micrometer, and comparison with Druid for Spring Boot applications.
This guide walks through building a production-ready OAuth2/OIDC authorization server using Spring Boot 3.x and Spring Authorization Server 1.3, covering client registration, authorization code flow with PKCE, custom JWT claims, RSA key rotation, MFA integration, and deployment best practices.
This article identifies five common MapStruct misuses — complex logic in @Mapping expressions, missing bidirectional relationship handling, over-mapping in hot paths, injecting business services into mappers, and naive PATCH updates — and shows correct Java alternatives for each case.
Lithe-IDEA is a lightweight open-source IDE alternative to IntelliJ IDEA for Java and Spring Boot developers, featuring on-demand service startup, ~300-400 MB base memory usage, familiar IDEA-like shortcuts, Spring Boot run/debug, Git diff review, AI commit messages, and built-in database tools, built with SwiftUI/AppKit on macOS and React/Tauri on Windows sharing a Rust core.
This tutorial demonstrates integrating Spring Boot with Poi-tl for dynamic Word document generation, covering template rendering, table row loops, image watermarks, dependency configuration, and production pitfalls like placeholder splitting and font issues.
This article introduces json-masker, a lightweight (~60 KB) zero-dependency Java library for masking sensitive fields in JSON, demonstrating up to 11x higher throughput than Jackson-based approaches with support for JSONPath, streaming API, allowlist/blocklist modes, and customizable masking strategies.
The author details using AI coding tools to build a multi-platform meal planning app (WeChat Mini Program, Android, iOS, web admin) with a Java backend, covering product positioning, tech stack selection, prompt engineering, phased development, acceptance testing, and pitfalls like hallucinations and code quality, concluding that AI accelerates solo development but human judgment remains essential for complex projects.
A real-world case study shows how systematic profiling with Spring Boot Actuator and JFR, combined with scan-scope reduction, selective @Lazy on external clients, HikariCP deferred connection, and ApplicationReadyEvent-driven async initialization cut a Spring Boot 3.1.5 order-service startup from 6.2 seconds to 1.8 seconds on Java 17.
This step-by-step tutorial covers importing a CentOS 7 VM in VMware, configuring dynamic and static IP addresses, troubleshooting network issues, installing JDK 1.8 and MySQL 5.7, and setting up Spring Boot and Tomcat 8.5 services for auto-start on boot using systemd.
This article details practical integration of Chinese national cryptographic algorithms SM2, SM3, and SM4 into Spring Boot, covering dependency setup, encryption/decryption, signing/verification, anti-replay protection, JWT implementation, TLS offloading via Nginx, key rotation strategies, and performance optimizations that raised throughput from 300 to 1300 TPS.
This article demonstrates the optimal way to integrate Testcontainers with Spring Boot tests using @TestConfiguration, @ServiceConnection, and @RestartScope for reusable Neo4j containers, avoiding dual lifecycle management, and shows how to extend this to dev services with Testcontainers Cloud fixed port mapping.
An API's sudden latency spike from 200ms to 8 seconds was traced not to slow SQL but to database connection pool exhaustion caused by @Transactional methods holding connections during external HTTP calls to a payment service; splitting transactions and moving external calls outside the transaction boundary resolved the issue.
This article details implementing Server-Sent Events (SSE) in Spring Boot for real-time server-to-client push, covering SseEmitter endpoints, connection registry with cleanup, heartbeat, Last-Event-ID reconnection, cluster broadcasting via Redis Pub/Sub, Base64 binary transfer, and production tuning for Nginx and thread pools.
This article details ten deprecated Spring Boot patterns — from field injection and @Value overuse to WebSecurityConfigurerAdapter and RestTemplate — and shows the recommended modern alternatives for Spring Boot 3.x and 4.x migrations.
This article demonstrates how to intercept and log SQL statements, parameters, and execution times in Spring Boot 3.5 by wrapping the DataSource with a proxy using the datasource-proxy library, without modifying any business code.
This article details a production-ready end-to-end encryption protocol for Spring Boot APIs using RSA-OAEP for key wrapping and AES-GCM for payload encryption, covering protocol specification, replay protection with Redis, key rotation strategies, filter-based decryption, testing failure paths, observability, and deployment validation.
This tutorial demonstrates how to integrate Tess4j with Spring Boot to create an OCR REST API, covering dependency setup, Tesseract engine initialization with language data configuration, image preprocessing tips, and a working controller example, plus a comparison of popular OCR engines and alternatives for improved Chinese text recognition.
This article details integrating Sa-Token 1.37.0 with Spring Boot 2.7.x and Redis 6.x for authentication, covering dependency setup, configuration, login implementation, dynamic permission via StpInterface, API replay protection using nonce/timestamp/signature, cluster deployment, comparison with Spring Security+JWT, and production pitfalls.
The article demonstrates how to correctly apply the DRY principle by refactoring seven duplicated notification service classes in Spring Boot 3.5.0 using the template method pattern and a NotificationMessage value object, consolidating 40 lines of repeated validation, logging, and error handling into a single abstract base class.
This article analyzes why Hutool 5 has become the standard Java utility library, detailing its modular design, code reduction benefits, performance improvements over JDK, and comparison with Guava and Apache Commons, while providing practical migration examples for strings, dates, files, HTTP, JSON, and AI integration.
This article details building real-time leaderboards using Redis ZSet with Spring Boot, covering score encoding for tie-breaking, multi-dimensional key design, pipeline and Lua optimizations, local caching, and data consistency strategies with benchmark results.
The article analyzes why Java virtual threads, despite promising million-concurrency with minimal code changes, see little production adoption due to pinning with synchronized, ThreadLocal memory pressure, incomplete framework support, and CPU-bound workload mismatch, while showing benchmarks where they excel in I/O-heavy services but migration costs deter legacy systems.
This article analyzes why Java virtual threads, despite promising million-concurrency with minimal overhead, see little production adoption due to pinning with synchronized blocks, ThreadLocal memory explosions, incomplete framework support, and unsuitability for CPU-bound workloads, while showing benchmarks where they excel in I/O-heavy scenarios.
This guide demonstrates building a reliable message queue with Spring Boot and Redis Stream, covering persistence, consumer group rebalancing, idempotency, dead-letter handling, and operational monitoring, with practical code examples and comparisons to Kafka and RabbitMQ.
This tutorial demonstrates how to replace auto-increment IDs with UUIDv7 in Spring Boot 3.5 using JPA and MyBatis-Plus, covering UUIDv7's timestamp-based structure, the java-uuid-generator library, and custom identifier generator implementations for both persistence frameworks.
The author migrates a Spring AI Agent with 30+ business tools to Spring AI 2.0's Tool Search, which uses Lucene indexing to let the model search for relevant tools before calling them, reducing context overload and improving selection accuracy, while sharing best practices for tool descriptions and safe write-operation handling.
After scaling a Spring Boot app to three Kubernetes replicas, @Scheduled tasks ran thrice, generating duplicate reports. The author evaluates distributed locks but adopts JobRunr for persistent, retryable, and monitorable background jobs, demonstrating integration with Spring Boot 4, code patterns for fire-and-forget, recurring, and delayed tasks, plus idempotency and deduplication strategies.
This article explains why Spring Cloud Gateway cannot coexist with Spring MVC due to fundamental model differences, and details how Spring Boot's DeferredImportSelector and conditional annotations enable intelligent auto-configuration by evaluating classpath, beans, and environment at runtime.
The author details migrating a high-volume logging platform from Elasticsearch to ClickHouse, covering schema design with ReplicatedMergeTree, Spring Boot integration via JDBC and MyBatis, materialized views for pre-aggregation, and optimization techniques like skip indexes, batch inserts, and capacity planning.
This article details the practical challenges and solutions when migrating from Spring Boot 3.x to 4.x, focusing on the Jackson 2 to 3 transition including package changes, exception handling updates, annotation exceptions, immutable ObjectMapper configuration, and coexistence strategies for legacy dependencies.
This article reviews three open-source Java solutions for integrating ComfyUI AI image generation: a lightweight SDK (ComfyUiApiJava), an API aggregation layer (comfy-flow-api) with Spring Boot 3, and a full-stack enterprise platform (comfyui-openrouter-ai) with user management, credits, and WebSocket progress, helping developers choose by complexity and needs.
This article details 10 practical message queue scenarios for Spring Boot microservices, covering system decoupling, asynchronous processing, traffic shaping for flash sales, data synchronization, centralized logging, broadcast configuration updates, ordered message processing, delayed messages for timeouts, retry mechanisms with dead-letter queues, and transactional messaging for distributed consistency, with code examples for RabbitMQ, Kafka, and RocketMQ.
The author tests Kafka 4.2 Share Groups (Kafka Queues) by migrating a report-generation task queue from RabbitMQ, showing how Share Groups enable elastic consumer scaling beyond partition limits, manual acknowledgment modes (ACCEPT/RELEASE/REJECT/RENEW), and long-task handling with renew(), while noting RabbitMQ's routing strengths remain relevant.
This article reviews two open-source projects — comfy-flow-api and comfyui-openrouter-ai — and a three-layer production architecture for integrating ComfyUI AI image generation into Java backends, covering RESTful API wrapping, load balancing, workflow JSON templating, and deployment strategies.
The article compares Spring @Scheduled, Quartz, and db-scheduler for clustered scheduling, showing how db-scheduler uses a single database table to provide cluster-safe mutex, persistence, and one-time delayed tasks without the overhead of Quartz's eleven tables or external middleware.
This article walks through a production-ready Spring Boot multi-tenancy implementation using database-per-tenant isolation, JWT-based tenant identification via Spring Security, AbstractRoutingDataSource for dynamic routing, and ThreadLocal context management, while exposing critical pitfalls in transaction timing, async task propagation, and dynamic tenant registration.
This article demonstrates how to store four independent notification channel switches (SMS, email, in-app, WeChat) in a single MySQL TINYINT column using bitwise operations, covering schema design, SQL queries, Java enum and utility classes, service and controller layers, MyBatis mapper, extensibility to N channels, and key considerations like indexing, concurrency, and readability.
The article walks through a complete Spring Boot implementation of WeChat‑like message recall, explaining why a simple DELETE is insufficient and detailing how to use a status flag, conditional UPDATE, WebSocket, Redis/MQ, and multi‑device session management to synchronize recall across all clients, even under concurrency and offline scenarios.
A hands-on guide to replacing MySQL spatial queries with Redis Geo for nearby-store search and geofencing, covering Spring Boot integration, GeoHash internals, coordinate-system pitfalls, pagination strategies, cluster key design, and real-world performance numbers from a 5,000-store convenience-chain deployment.
The article explains why notification services are hard—slow delivery, unreliable third‑party providers, and status tracking—and shows how to solve these issues by fully decoupling the API from workers using a message queue, with detailed Spring Boot code examples and scaling strategies.
The author refactors an old Spring Cloud project by removing Feign, replacing @FeignClient with Spring Boot 4.x’s native @HttpExchange and @ImportHttpServices, and demonstrates that Spring’s built‑in HTTP Service Client provides the same declarative convenience with less boilerplate, while still supporting custom configuration, error handling, and reactive use cases.
The article examines a common duplicate‑order bug caused by client retries after network timeouts, explains why @Transactional alone cannot guarantee idempotency, critiques simple Redis SETNX solutions, and presents a robust Spring Boot design that stores idempotency records together with order data in a single MySQL transaction, uses request fingerprints, unique keys, and owner tokens to safely replay or reject retries while handling concurrency and cleanup.
This article explains why adding a Spring Boot starter dependency instantly creates the required beans without XML or manual configuration, walks through the auto‑configuration mechanism—including @EnableAutoConfiguration, AutoConfigurationImportSelector, and conditional annotations—and shows step‑by‑step how to build a custom starter from scratch with Maven, configuration properties, an aspect, and registration files.
This article details integrating Netty with Spring Boot to build a scalable TCP long-connection gateway, covering binary protocol design with length-field framing, heartbeat detection using IdleStateHandler, session management with Redis and local maps, single-node and Redis Pub/Sub cluster push mechanisms, and performance tuning tips including Epoll transport and thread pool isolation.
The article explains the Open‑Closed Principle, shows how Spring leaves empty hook methods like onRefresh() for extensions, demonstrates the concept with a Java demo, compares inheritance‑based and interface‑based extension approaches, and discusses trade‑offs and practical guidelines for designing extension points.
This article presents eight self‑test gRPC interview questions covering performance, contract, cross‑language support, streaming, HTTP/2 fundamentals, Protobuf field tags, call patterns, retryable status codes, load‑balancing policies, interceptor usage, and Spring Boot 3 integration, each accompanied by concise reference answers.
This article provides a practical guide to integrating Spring Boot with Keycloak for unified authentication and single sign-on using OIDC authorization code flow, covering Keycloak deployment, realm and client configuration, Spring Security setup with role mapping for both browser login and resource server tokens, method-level authorization with @PreAuthorize, and extensions for multi-tenancy, LDAP federation, and Admin API.
The article explains how the traditional find‑by‑id‑then‑save pattern causes two database round‑trips and concurrency bugs, and shows that Spring Data 4.1’s single‑statement Upsert (JdbcAggregateTemplate.upsert) lets the database decide INSERT or UPDATE in one SQL, reducing latency and race conditions while outlining its limitations and ideal use cases.
This comprehensive guide walks through Harness Engineering concepts, the seven‑layer architecture, environment setup, full Spring Boot codebase, agent configuration, best‑practice recommendations, testing procedures, common issues, and advanced directions for building controllable AI agents with Spring AI Alibaba.
This article explores CosId's two ID generation modes—local computation (Snowflake) and segment allocation (SegmentId, SegmentChainId)—with detailed configuration for JDBC, Redis, ZooKeeper, MongoDB, and Proxy backends, plus Spring Boot, MyBatis, and ShardingSphere integration examples.
This guide covers integrating iText 7 with Spring Boot to generate dynamic PDFs via AcroForm templates or code, add PAdES-compliant digital signatures with visible seals, and implement async processing with RabbitMQ, MinIO storage, and expiring download links, plus font handling, memory optimization, and AGPL licensing advice.
The article explains why a successful database transaction can leave an order incomplete when the accompanying Kafka message fails, examines the limitations of @Transactional, and demonstrates how Spring Modulith's Event Publication Registry and the Outbox pattern provide reliable, idempotent messaging solutions.
