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Top Architecture Tech Stack

Jun 5, 2025 · Fundamentals

Understanding Java ClassLoader, Class Loading Process, Dynamic Loading, and Object Layout with JOL

This article explains Java's ClassLoader architecture, the parent delegation model, the three phases of class loading, dynamic loading and binding mechanisms, and demonstrates how to inspect object layout using the JOL tool, providing code examples and practical insights for JVM internals.

ClassLoaderJOLJVM

0 likes · 11 min read

Understanding Java ClassLoader, Class Loading Process, Dynamic Loading, and Object Layout with JOL

Code Ape Tech Column

Sep 1, 2021 · Fundamentals

Understanding Java Object Memory Layout with JOL

This article explains how Java objects are stored in memory, covering the object header, instance data, alignment padding, lock states, pointer compression, and field reordering, and demonstrates how to inspect these structures using the OpenJDK JOL tool with practical code examples.

JOLJVMJava

0 likes · 20 min read

Understanding Java Object Memory Layout with JOL

Spring Full-Stack Practical Cases

Jul 18, 2021 · Fundamentals

How Much Memory Does a Java Object Really Use? A JOL Walkthrough

This article explains how to calculate the exact memory footprint of a Java object using the OpenJDK JOL tool, covering object header composition, 8‑byte alignment, padding rules, and concrete examples for regular objects and char arrays.

Byte AlignmentJOLJava

0 likes · 4 min read

How Much Memory Does a Java Object Really Use? A JOL Walkthrough