An Explanation Of Restrictions Limiting The Java Max Heap (-Xmx) To Around 1500M For 32bit JDK's On Microsoft Windows (Doc ID 557813.1)

Last updated on FEBRUARY 14, 2025

Applies to:

Goal

This document presents an overview of memory addressing schemes that apply to hardware platforms, such as the x86 and x86-64 architectures that typically run Microsoft Windows systems, and illustrates why by default the maximum JAVA heap that can be set for a 32bit JDK cannot be higher than about 1500M.

Solution

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