---
title: sun.io.useCanonCaches Java System Property
prop: sun.io.useCanonCaches
description: The sun.io.useCanonCaches java system property is used to disable the canonical paths cache
layout: layout
date: Last Modified
nav: system
tags: networking
since: 1.4
example_value: false
---

<div class="jumbotron">
	<h1> Java System Property</h1>
	<div class="lead">The <code></code> Java System Property is used to disable the canonical paths cache.</div>
</div>
<h2>Default Value</h2>
<pre>true</pre>

<h2><code></code> Overview</h2>
<p></p>
<p>The <code>java.io.File</code> class implements an internal cache (<code>java.io.ExpiringCache</code>) of canonical paths designed to improve performance of the <code>getCanonicalFile</code> and <code>getCanonicalPath</code> methods.</p>
<p>This cache has been known to cause security issues on Windows due to file system case insensitivity.</p>