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 </style></head><body bgcolor="#ffffff" text="#000000" link="#525D76" alink="#525D76" vlink="#525D76"><table border="0" width="100%" cellspacing="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://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 7.0.77, Mar 28 2017</font></td><td><!--APACHE LOGO--><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"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr noshade size="1"></td></tr><tr><!--LEFT SIDE NAVIGATION--><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="http://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><!--RIGHT SIDE MAIN BODY--><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>

 </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote>

   <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>

     <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">className</code></td><td align="left" valign="center">
         <p>Java class name of the implementation to use.  This class must
         implement the <code>org.apache.tomcat.JarScanner</code> interface.
         If not specified, the standard value (defined below) will be used.</p>
       </td></tr></table>

   </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>
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	</style></head><body bgcolor="#ffffff" text="#000000" link="#525D76" alink="#525D76" vlink="#525D76"><table border="0" width="100%" cellspacing="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://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 7.0.77, Mar 28 2017</font></td><td><!--APACHE LOGO--><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"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr noshade size="1"></td></tr><tr><!--LEFT SIDE NAVIGATION--><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="http://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><!--RIGHT SIDE MAIN BODY--><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>

	</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote>

	<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>

	<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">className</code></td><td align="left" valign="center">
	<p>Java class name of the implementation to use. This class must
	implement the <code>org.apache.tomcat.JarScanner</code> interface.
	If not specified, the standard value (defined below) will be used.</p>
	</td></tr></table>

	</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>'*' means zero or more characters,</li>
	<li>'?' 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>
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	<p>No special features are associated with a <strong>Jar Scanner</strong>
	element.</p>
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