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Code Editor : jar-scanner.html

<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat 7 Configuration Reference (7.0.107) - The Jar Scanner Component</title><style type="text/css" media="print">
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</style></head><body bgcolor="#ffffff" text="#000000" link="#525D76" alink="#525D76" vlink="#525D76"><table border="0" width="100%" cellspacing="0"><tr><td><a href="https://tomcat.apache.org/"><img src="../images/tomcat.gif" align="right" alt="
    The Apache Tomcat Servlet/JSP Container
  " border="0"></a></td><td><h1><font face="arial,helvetica,sanserif">Apache Tomcat 7</font></h1><font face="arial,helvetica,sanserif">Version 7.0.107, Nov 18 2020</font></td><td><a href="http://www.apache.org/"><img src="../images/asf-logo.svg" align="right" alt="Apache Logo" border="0" style="width: 266px;height: 83px;"></a></td></tr></table><table border="0" width="100%" cellspacing="4"><tr><td colspan="2"><hr noshade size="1"></td></tr><tr><td width="20%" valign="top" nowrap class="noPrint"><p><strong>Links</strong></p><ul><li><a href="../index.html">Docs Home</a></li><li><a href="index.html">Config Ref. Home</a></li><li><a href="https://wiki.apache.org/tomcat/FAQ">FAQ</a></li><li><a href="#comments_section">User Comments</a></li></ul><p><strong>Top Level Elements</strong></p><ul><li><a href="server.html">Server</a></li><li><a href="service.html">Service</a></li></ul><p><strong>Executors</strong></p><ul><li><a href="executor.html">Executor</a></li></ul><p><strong>Connectors</strong></p><ul><li><a href="http.html">HTTP</a></li><li><a href="ajp.html">AJP</a></li></ul><p><strong>Containers</strong></p><ul><li><a href="context.html">Context</a></li><li><a href="engine.html">Engine</a></li><li><a href="host.html">Host</a></li><li><a href="cluster.html">Cluster</a></li></ul><p><strong>Nested Components</strong></p><ul><li><a href="globalresources.html">Global Resources</a></li><li><a href="jar-scanner.html">JarScanner</a></li><li><a href="listeners.html">Listeners</a></li><li><a href="loader.html">Loader</a></li><li><a href="manager.html">Manager</a></li><li><a href="realm.html">Realm</a></li><li><a href="resources.html">Resources</a></li><li><a href="sessionidgenerator.html">SessionIdGenerator</a></li><li><a href="valve.html">Valve</a></li></ul><p><strong>Cluster Elements</strong></p><ul><li><a href="cluster.html">Cluster</a></li><li><a href="cluster-manager.html">Manager</a></li><li><a href="cluster-channel.html">Channel</a></li><li><a href="cluster-membership.html">Channel/Membership</a></li><li><a href="cluster-sender.html">Channel/Sender</a></li><li><a href="cluster-receiver.html">Channel/Receiver</a></li><li><a href="cluster-interceptor.html">Channel/Interceptor</a></li><li><a href="cluster-valve.html">Valve</a></li><li><a href="cluster-deployer.html">Deployer</a></li><li><a href="cluster-listener.html">ClusterListener</a></li></ul><p><strong>web.xml</strong></p><ul><li><a href="filter.html">Filter</a></li></ul><p><strong>Other</strong></p><ul><li><a href="systemprops.html">System properties</a></li></ul></td><td width="80%" valign="top" align="left" id="mainBody"><h1>The Jar Scanner Component</h1><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Table of Contents"></a><a name="Table_of_Contents"><strong>Table of Contents</strong></a></font></td></tr><tr><td><blockquote>
<ul><li><a href="#Introduction">Introduction</a></li><li><a href="#Attributes">Attributes</a><ol><li><a href="#Common_Attributes">Common Attributes</a></li><li><a href="#Standard_Implementation">Standard Implementation</a></li></ol></li><li><a href="#Nested_Components">Nested Components</a></li><li><a href="#Special_Features">Special Features</a></li></ul>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote>

<p>The <strong>Jar Scanner</strong> element represents the component that is
  used to scan the web application for JAR files. It is typically used during
  web application start to identify configuration files such as TLDs or
  web-fragment.xml files that must be processed as part of the web application
  initialisation.</p>

<p>A Jar Scanner element MAY be nested inside a
  <a href="context.html">Context</a> component.  If it is not included,
  a default Jar Scanner configuration will be created automatically, which
  is sufficient for most requirements.</p>

<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Common Attributes"></a><a name="Common_Attributes"><strong>Common Attributes</strong></a></font></td></tr><tr><td><blockquote>

<p>All implementations of <strong>Jar Scanner</strong>
    support the following attributes:</p>

</blockquote></td></tr></table>

<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Standard Implementation"></a><a name="Standard_Implementation"><strong>Standard Implementation</strong></a></font></td></tr><tr><td><blockquote>

<p>The standard implementation of <strong>Jar Scanner</strong> is
    <strong>org.apache.tomcat.util.scan.StandardJarScanner</strong>.
    Additional attributes that it supports (in addition to the common attributes
    listed above) are listed in the table.</p>

<p>There are several
    <a href="systemprops.html#JAR_Scanning">system properties</a>
    that control what JAR files are skipped by JarScanner.
    Those properties are lists of file name pattern. The
    patterns are separated by comma (','). The leading and trailing whitespace
    characters in a pattern are ignored. The patterns are matched
    case-sensitively. The following two special characters are supported:</p>

<ul>
      <li>'*' &#151; means zero or more characters,</li>
      <li>'?' &#151; means one and only one character.</li>
    </ul>

<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="attributeName">scanAllDirectories</code></td><td align="left" valign="center">
       <p>If <code>true</code>, any directories found on the classpath will be
       checked to see if they are expanded JAR files.
       The default is <code>false</code>.</p>
       <p>Tomcat determines if a directory is an expanded JAR file by looking
       for a META-INF sub-directory. Only if the META-INF sub-directory exists,
       the directory is assumed to be an expanded JAR file.</p>
      </td></tr><tr><td align="left" valign="center"><code class="attributeName">scanAllFiles</code></td><td align="left" valign="center">
       <p>If <code>true</code>, any files found on the classpath will be checked
       to see if they are Jar files rather than relying on the file extension
       being <code>.jar</code>. The default is <code>false</code>.</p>
      </td></tr><tr><td align="left" valign="center"><code class="attributeName">scanClassPath</code></td><td align="left" valign="center">
       <p>If <code>true</code>, the full web application classpath, including
       the shared and common classloaders and the system classpath (but not the
       bootstrap classpath) will be scanned for Jar files in addition to the web
       application. The default is <code>true</code>. </p>
      </td></tr><tr><td align="left" valign="center"><code class="attributeName">scanBootstrapClassPath</code></td><td align="left" valign="center">
       <p>If <strong>scanClassPath</strong> is <code>true</code> and this is
       <code>true</code> the bootstrap classpath will also be scanned for Jar
       files. The default is <code>false</code>.</p>
      </td></tr></table>

</blockquote></td></tr></table>

</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Nested Components"></a><a name="Nested_Components"><strong>Nested Components</strong></a></font></td></tr><tr><td><blockquote>
  <p>No components may be nested inside a <strong>Jar Scanner</strong> element.
  </p>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Special Features"></a><a name="Special_Features"><strong>Special Features</strong></a></font></td></tr><tr><td><blockquote>
  <p>No special features are associated with a <strong>Jar Scanner</strong>
  element.</p>
</blockquote></td></tr></table></td></tr><tr><td colspan="2"><hr noshade size="1"></td></tr><tr><td colspan="2"><div align="center"><font color="#525D76" size="-1"><em>
        Copyright &copy; 1999-2020, Apache Software Foundation
        </em></font></div></td></tr></table></body></html>

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Code Editor : jar-scanner.html