Why Does JVM Allocate Objects in Multiple Steps? Explore Creation & Memory Layout

This article explains the JVM's object creation process—including stack allocation, TLAB checks, Eden and Survivor spaces, and GC handling—and details the memory layout of Java objects, covering object headers, class pointers, array lengths, padding, and the effect of compressed oops on 32‑bit versus 64‑bit systems.

Garbage CollectionJVMObject Creation

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Why Does JVM Allocate Objects in Multiple Steps? Explore Creation & Memory Layout

Bin's Tech Cabin

Mar 4, 2022 · Fundamentals

Why Java Objects Need Memory Alignment: Deep Dive into JVM Layout, False Sharing, and Compressed Oops

This article explains how Java objects are laid out in the JVM heap, why fields are reordered and padded for alignment, how false sharing degrades performance, and how the @Contended annotation and compressed oops help mitigate these issues, all backed by detailed diagrams and code examples.

JVMcompressed oopsfalse sharing

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Why Java Objects Need Memory Alignment: Deep Dive into JVM Layout, False Sharing, and Compressed Oops

Architect's Tech Stack

Sep 29, 2021 · Fundamentals

Understanding Java Object Memory Layout, Size of new Object() and Heap Allocation

This article explains how Java objects are laid out in memory, compares the heap locations of fields and local variables, analyzes the byte size of a plain new Object() with and without compressed oops, demonstrates measurement using JOL, and reviews related heap regions and garbage‑collection concepts.

Garbage CollectionJVMObject Memory Layout

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Understanding Java Object Memory Layout, Size of new Object() and Heap Allocation