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Custom ClassLoader

18 articles · Page 1 of 1
Dabaoshi
Dabaoshi
Aug 8, 2026 · Fundamentals

Understanding JVM Class Loading: Mechanisms, Delegation, and Custom ClassLoaders

This article walks through the full lifecycle of a Java class—from loading, verification, preparation, and resolution to initialization, usage, and unloading—explains active versus passive references, the parent‑delegation model, JDK 8‑to‑17 module‑system changes, and shows how to write a custom ClassLoader for class isolation.

Class LoadingClassLoaderCustom ClassLoader
0 likes · 26 min read
Understanding JVM Class Loading: Mechanisms, Delegation, and Custom ClassLoaders
macrozheng
macrozheng
Jan 22, 2026 · Backend Development

Mastering Java SPI: Build a Pluggable Authentication System with Spring Boot

This guide explains Java's Service Provider Interface (SPI) mechanism, compares it with APIs, and walks through creating a multi‑module Maven project that defines SPI interfaces, implements plugins, loads external JARs with a custom class loader, and integrates the plugins into a Spring Boot application for dynamic authentication.

Custom ClassLoaderDynamic LoadingJava SPI
0 likes · 15 min read
Mastering Java SPI: Build a Pluggable Authentication System with Spring Boot
Java Backend Technology
Java Backend Technology
Sep 15, 2025 · Backend Development

How to Dynamically Load External JARs into SpringBoot and Scan Them

This guide explains how to load external JAR files into the JVM, configure SpringBoot to recognize them, and choose among several class‑loading strategies—including expanding the classpath, using the loader.path parameter, or implementing a custom classloader—while providing Maven configuration examples and code snippets.

Class LoadingCustom ClassLoaderJava
0 likes · 9 min read
How to Dynamically Load External JARs into SpringBoot and Scan Them
Architect's Must-Have
Architect's Must-Have
Jun 18, 2025 · Backend Development

How to Dynamically Load External JARs into Spring Boot at Runtime

This guide explains step‑by‑step how to load external JAR files into the JVM, configure Spring Boot to recognize them, and choose among four practical solutions—including classpath expansion, Spring Boot loader.path, custom class loaders, and JVM boot classpath tweaks—while highlighting their pros, cons, and required Maven settings.

Class LoadingCustom ClassLoaderJVM
0 likes · 10 min read
How to Dynamically Load External JARs into Spring Boot at Runtime
macrozheng
macrozheng
Oct 25, 2024 · Fundamentals

Why and How Java Breaks the Parent Delegation Model: Real-World Scenarios

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.

ClassLoaderCustom ClassLoaderJDBC
0 likes · 11 min read
Why and How Java Breaks the Parent Delegation Model: Real-World Scenarios
Su San Talks Tech
Su San Talks Tech
Jun 24, 2024 · Fundamentals

How to Break Java’s Parent Delegation Mechanism and Why It Matters

This article explains the purpose of Java's parent delegation class‑loader mechanism, describes its three built‑in loaders, and details common scenarios—such as JNDI, JDBC, Tomcat, and OSGi—where developers intentionally break the delegation to achieve flexibility and isolation.

ClassLoaderCustom ClassLoaderJDBC
0 likes · 10 min read
How to Break Java’s Parent Delegation Mechanism and Why It Matters
Java Tech Enthusiast
Java Tech Enthusiast
Mar 2, 2024 · Backend Development

Dynamic Loading and Unloading of Java Governance Tasks with Custom ClassLoader and XXL‑Job Integration

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.

Custom ClassLoaderDynamic LoadingJava
0 likes · 21 min read
Dynamic Loading and Unloading of Java Governance Tasks with Custom ClassLoader and XXL‑Job Integration
Selected Java Interview Questions
Selected Java Interview Questions
Feb 4, 2024 · Backend Development

Dynamic Loading and Unloading of Governance Tasks in Java Using a Custom ClassLoader and XXL‑Job

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.

Custom ClassLoaderDynamic Class LoadingJava
0 likes · 17 min read
Dynamic Loading and Unloading of Governance Tasks in Java Using a Custom ClassLoader and XXL‑Job
IT Services Circle
IT Services Circle
Mar 11, 2023 · Fundamentals

Understanding Java Class Loaders and the Parent Delegation Model

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.

ClassLoaderCustom ClassLoaderJVM
0 likes · 16 min read
Understanding Java Class Loaders and the Parent Delegation Model
Ops Development Stories
Ops Development Stories
Jan 14, 2022 · Fundamentals

When Does Java Load a Class? Exploring the 7 Stages, Parent Delegation, and Custom ClassLoaders

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.

Class LoadingClassLoaderCustom ClassLoader
0 likes · 16 min read
When Does Java Load a Class? Exploring the 7 Stages, Parent Delegation, and Custom ClassLoaders
Full-Stack Internet Architecture
Full-Stack Internet Architecture
Jan 19, 2021 · Backend Development

Understanding Java's Parent Delegation Model: Mechanism, Implementation, and How to Break It

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.

Class LoadingClassLoaderCustom ClassLoader
0 likes · 14 min read
Understanding Java's Parent Delegation Model: Mechanism, Implementation, and How to Break It
Alibaba Cloud Developer
Alibaba Cloud Developer
Dec 29, 2020 · Backend Development

How to Implement Class Isolation in Java with Custom ClassLoaders

This article explains why jar version conflicts cause runtime errors in Java, introduces class isolation as a solution, and provides step‑by‑step implementations of custom ClassLoaders using both findClass and loadClass overrides, complete with code examples and execution results.

Class IsolationClassLoaderCustom ClassLoader
0 likes · 13 min read
How to Implement Class Isolation in Java with Custom ClassLoaders
Java Captain
Java Captain
Dec 5, 2017 · Fundamentals

Understanding the Java Virtual Machine: Class Loading and Runtime Data Area

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.

Class LoadingCustom ClassLoaderJVM
0 likes · 11 min read
Understanding the Java Virtual Machine: Class Loading and Runtime Data Area