Cognitive Technology Team regularly delivers the latest IT news, original content, programming tutorials and experience sharing, with daily perks awaiting you.
This tutorial explains how to implement sequential streaming for multipart uploads and downloads in Spring MVC and reactive streaming in Spring WebFlux, enabling large files to be processed without excessive memory usage and improving performance for high‑load web applications.
Learn to identify JVM memory leaks in production by monitoring heap usage, analyzing GC logs, using heap dumps and runtime profiling, and applying prevention patterns such as bounded caches, proper resource cleanup, and safe reference handling to avoid OutOfMemoryError crashes.
This article explains why MQTT needs security and provides practical guidance on implementing TLS encryption, robust authentication mechanisms, and fine‑grained access‑control policies to build a resilient IoT network.
kkFileView is an open‑source Spring Boot service that provides RESTful APIs for online preview of over 100 file types—including documents, images, media, CAD, and 3D models—offering high performance, caching, security mechanisms, and easy integration for enterprise applications.
This article explains why Spring Cloud @RefreshScope beans may still return old configuration values after a /actuator/refresh call, analyzes the underlying proxy mechanism, and presents four practical solutions—including ObjectProvider and @ConfigurationProperties—along with pitfalls, validation steps, and performance comparisons.
This article explains why Redisson's RMapCache.size() includes expired entries, demonstrates how to obtain the exact number of currently valid key‑value pairs using keySet().size() or readAllEntrySet().size(), and provides performance tips and a real‑world e‑commerce use case.
This guide explains why adding the javacv‑platform dependency inflates a Java project's JAR to hundreds of megabytes and shows how to configure Maven to include only the needed native libraries, dramatically reducing size, build time, and deployment overhead.
An e‑commerce Spring Boot service crashed when uploading large files because Linux’s /tmp is a memory‑based tmpfs that fills RAM, causing OOM kills; the article explains the underlying tmpfs behavior, common pitfalls, and a three‑step solution using /var/tmp with proper configuration and permissions.
An unexpected data loss issue in a ShardingSphere‑JDBC setup was traced to Druid’s poolPreparedStatements cache, which reuses PreparedStatement objects across different shards, bypassing dynamic routing; disabling the cache or switching to HikariCP restores correct sharding behavior with minimal performance impact.
This article explains how to use Spring's BeanRegistrar to programmatically register beans with precise scope, lazy initialization, and custom providers, offering advantages over traditional annotation‑based configuration and demonstrating the approach with a complete GreetingService example.
