58 posts tagged with "java"

Seata client startup wires application configuration to the transaction coordinator and prepares resource interception.

The Java Virtual Machine provides a managed execution environment for bytecode. Understanding its memory model, class lifecycle, execution engine, and diagnostics makes Java failures easier to explain and tune.

List defines an ordered collection that permits positional access and usually allows duplicate elements. Implementations differ substantially in storage layout and performance.

A production Nacos deployment should use multiple nodes and an external supported database rather than embedded standalone storage.

Canal reads MySQL binary logs and exposes row-level change events to downstream consumers. It is commonly used for cache synchronization, search indexing, auditing, and data pipelines.

Lombok modifies compilation through annotation processing. A project may build in Maven while the IDE reports errors, or work in the IDE while CI fails, when those environments use different processors or Java versions.

A Java agent can observe or transform classes as the JVM loads them. Startup agents enter through premain; agents attached to a running JVM enter through agentmain.

Enable scheduling with @EnableScheduling, then annotate managed bean methods with @Scheduled.

A RocketMQ cluster normally uses multiple independent NameServers and one or more broker groups. Each broker group has a stable brokerName; broker ID 0 is the primary and nonzero IDs are replicas in older master/slave terminology.

RocketMQ is a distributed messaging platform built around NameServer discovery, brokers that store messages, producers, consumers, topics, and message queues.