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This article explains how to configure a Spring Boot scheduled task to execute just once, covering three approaches—specifying a start time with TaskScheduler, using @Scheduled with an initial delay, and creating a custom PeriodicTrigger—complete with runnable code examples.
This article explains three Spring Boot approaches—using @Scheduled tasks, RabbitMQ delayed queues, and Redis key‑expiration events—to automatically cancel orders that remain unpaid for 30 minutes, complete with code samples and configuration guidance.
The article explains how to extend Java's ThreadPoolExecutor by dynamically increasing or decreasing corePoolSize according to the task queue length, using setCorePoolSize, a daemon monitoring thread, and scheduled tasks to improve asynchronous processing performance in Spring Boot applications.
The article explains how to process a batch of overdue unpaid orders in a Spring scheduled task by wrapping each order's business logic in a separate REQUIRES_NEW transaction, catching exceptions, and manually rolling back only the failing transaction so that other orders remain unaffected.
The article explains how to automatically close unpaid e‑commerce orders by comparing five approaches—simple scheduled tasks, RocketMQ delayed messages, RabbitMQ dead‑letter queues, a time‑wheel algorithm, and Redis key‑expiration listeners—detailing their advantages, drawbacks, and providing Java code examples for each method.
The article explains how delayed message queues replace inefficient scheduled‑task scans in distributed systems, outlines common use cases such as order timeouts and retries, compares RabbitMQ, RocketMQ, Kafka, ActiveMQ and Redis implementations, and details NetEase’s ActiveMQ‑based solution with idempotent processing and traceability.
This article explains how to diagnose and manually re‑execute a Spring @Scheduled task that fails to send notifications by using Arthas to obtain the ApplicationContext, invoke the bean method, and reveals that a missing timeout in Hutool caused the original hang.