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This article explains the purpose of Java's parent‑delegation class‑loading mechanism, describes its three built‑in loaders, shows how custom loaders can override it, and explores common situations—such as JNDI, JDBC, Tomcat, and OSGi—where developers intentionally break the delegation for flexibility and modularity.
The article presents a Java Spring solution that uses a custom URLClassLoader to dynamically load, register, and unload governance task JARs as Spring beans and XXL‑Job handlers at runtime, with configuration persistence via YAML or Nacos and Maven Shade packaging for seamless updates without service restarts.
This article explains how to design a plug‑in style architecture for data‑governance tasks by creating a custom URLClassLoader, dynamically loading JARs into a Spring context, registering and deregistering XXL‑Job handlers, updating configuration via YAML or Nacos, and finally unloading resources without restarting the service.
This article explains the Java class‑loading mechanism, reviews the load‑link‑initialize process, describes the built‑in Bootstrap, Extension and Application class loaders, introduces the parent‑delegation model, shows its execution flow with code examples, and discusses how to customize or break the model.
This article explains the complete Java class loading lifecycle—including loading, verification, preparation, resolution, initialization, usage, and unloading—details the seven scenarios that trigger active loading, illustrates the parent delegation model, and provides code examples for custom and Tomcat class loaders.
This article explains Java's parent delegation class‑loading model, describes the four built‑in class loaders, details why delegation is needed, shows the loadClass implementation, and discusses how and why the mechanism can be overridden in frameworks such as JDBC, Tomcat, OSGi, and the Java 9 module system.
This article explains the JVM execution process, details the hierarchy and delegation model of class loaders, provides a custom ClassLoader implementation with example code, and describes the structure and function of the runtime data area including heap, method area, stacks, and program counter.
This article explains Java's class loading process, the sources of class files, the hierarchy of built‑in class loaders, the parent‑delegation model, and demonstrates how to create and use a custom NetworkClassLoader for dynamic remote class loading.