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    <p>By default, Jetty always expands WAR files.</p> <p>You can configure it to not expand by using the <code>extractWAR</code> in your <a href="http://www.eclipse.org/jetty/documentation/9.0.6.v20130930/configuring-specific-webapp-deployment.html" rel="nofollow noreferrer">advanced configuration descriptor file</a>.</p> <p>However, what I think you are actually asking about, is how does the web app / servlet spec temp directory logic work?</p> <p>The tempDirectory used by Jetty is determined by a number of factors, mostly dictated by the servlet spec. <a href="https://stackoverflow.com/a/19232771/775715">See prior answer about the topic of tempDirectory configuration for details</a>.</p> <p>When the temp directory is unspecified / unconfigured a new temp directory is created using the <a href="https://github.com/eclipse/jetty.project/blob/jetty-9.0.6.v20130930/jetty-webapp/src/main/java/org/eclipse/jetty/webapp/WebInfConfiguration.java#L599-L699" rel="nofollow noreferrer">following rough syntax</a>.</p> <pre class="lang-java prettyprint-override"><code>File tempDir = new File(System.getProperty("java.io.tmpdir") + File.separator + "jetty-" + host + "-" + port + "-" + resourceBase + "-_" + context + "-" + virtualhost + "-" + randomdigits + ".dir"); </code></pre> <p>The temp directory used is persisted, meaning it is not deleted on server shutdown. The temp directory is used to unpack the WAR into when the WAR file (or context deployable XML) is determined to be newer than the content in the persisted temp directory.</p> <p>Starting with Jetty 9.1, there is now a <code>WebAppContext.setPersistTempDirectory(boolean)</code> that can be used to turn off the temp directory persistence.</p>
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    1. POHow does jetty figures out whether to expand a war on start or not
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    1. USJoakim Erdfelt
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    1. COyou mentioned that jetty unpacks the war file if it is newer. what if i replace the war file with older version? will jetty unpack it again on server restart?
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      1. USMukesh Kumar
 

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