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<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat 7 Configuration Reference (7.0.108) - System Properties</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"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><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 7.0.108, Jan 28 2021</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="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><!--RIGHT SIDE MAIN BODY--><td width="80%" valign="top" align="left" id="mainBody"><h1>System Properties</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="#Property_replacements">Property replacements</a></li><li><a href="#Clustering">Clustering</a></li><li><a href="#Expression_Language">Expression Language</a></li><li><a href="#Jasper">Jasper</a></li><li><a href="#Security">Security</a></li><li><a href="#Specification">Specification</a></li><li><a href="#Sessions">Sessions</a></li><li><a href="#Logging">Logging</a></li><li><a href="#JAR_Scanning">JAR Scanning</a></li><li><a href="#Websockets">Websockets</a></li><li><a href="#Other">Other</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 following sections list the system properties that may be set to modify
the default Tomcat behaviour.</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="Property replacements"><!--()--></a><a name="Property_replacements"><strong>Property replacements</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Property</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat.util.digester. PROPERTY_SOURCE</code></td><td align="left" valign="center">
<p>Set this to a fully qualified name of a class that implements
<code>org.apache.tomcat.util.IntrospectionUtils.PropertySource</code>.
Required to have a public constructor with no arguments.</p>
<p>Use this to add a property source, that will be invoked when
<code>${parameter:-default-value}</code> denoted parameters (with
optional default values) are found in the XML files that Tomcat
parses.</p>
<p><code>org.apache.tomcat.util.digester.EnvironmentPropertySource</code>
can be used to replace parameters from the process' environment
variables, e.g. injected ConfigMaps or Secret objects in container
based systems like OpenShift or Kubernetes.</p>
</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="Clustering"><strong>Clustering</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Property</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina. tribes.dns_lookups</code></td><td align="left" valign="center">
<p>This system property is deprecated and will be removed without
replacement in Apache Tomcat 10 onwards.</p>
<p>If <code>true</code>, the clustering module will attempt to use DNS to
resolve any host names provided in the cluster configuration.</p>
<p>If not specified, the default value of <code>false</code> will be used.</p>
</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="Expression Language"><!--()--></a><a name="Expression_Language"><strong>Expression Language</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Property</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.el.BeanELResolver. CACHE_SIZE</code></td><td align="left" valign="center">
<p>The number of javax.el.BeanELResolver.BeanProperties objects that will
be cached by the EL Parser.</p>
<p>If not specified, the default of <code>1000</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.el.ExpressionBuilder. CACHE_SIZE</code></td><td align="left" valign="center">
<p>The number of parsed EL expressions that will be cached by the EL
Parser.</p>
<p>If not specified, the default of <code>5000</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.el.parser. COERCE_TO_ZERO</code></td><td align="left" valign="center">
<p>If <code>true</code>, when coercing expressions to numbers
<code>""</code> and <code>null</code> will be coerced to zero as required
by the specification.</p>
<p>If not specified, the default value of <code>true</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.el.parser. SKIP_IDENTIFIER_CHECK</code></td><td align="left" valign="center">
<p>If <code>true</code>, when parsing expressions, identifiers will not be
checked to ensure that they conform to the Java Language Specification for
Java identifiers.</p>
<p>If not specified, the default value of <code>false</code> will be used.</p>
</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="Jasper"><strong>Jasper</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Property</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.compiler. Generator.POOL_TAGS_WITH_EXTENDS</code></td><td align="left" valign="center">
<p>By default, JSPs that use their own base class via the extends
attribute of the page directive, will have Tag pooling disabled since
Jasper cannot guarantee that the necessary initialisation will have taken
place. This can have a negative impact on performance. Providing the
alternative base class calls _jspInit() from Servlet.init(), setting this
property to <code>true</code> will enable pooling with an alternative base
class. If the alternative base class does not call _jspInit() and this
property is <code>true</code>, NPEs will occur when attempting to use
tags.</p>
<p>If not specified, the default value of <code>false</code> will be used.
</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.compiler. Generator.STRICT_GET_PROPERTY</code></td><td align="left" valign="center">
<p>If <code>true</code>, the requirement to have the object referenced in
<code>jsp:getProperty</code> action to be previously "introduced"
to the JSP processor, as specified in the chapter JSP.5.3 of JSP 2.0 and
later specifications, is enforced.</p>
<p>If not specified, the specification compliant default of
<code>true</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.compiler. Generator.VAR_EXPRESSIONFACTORY</code></td><td align="left" valign="center">
<p>The name of the variable to use for the expression language expression
factory.</p>
<p>If not specified, the default value of <code>_el_expressionfactory</code>
will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.compiler. Generator.VAR_INSTANCEMANAGER</code></td><td align="left" valign="center">
<p>The name of the variable to use for the instance manager factory.</p>
<p>If not specified, the default value of <code>_jsp_instancemanager</code>
will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.compiler. Parser.STRICT_QUOTE_ESCAPING</code></td><td align="left" valign="center">
<p>If <code>false</code> the requirements for escaping quotes in JSP
attributes will be relaxed so that an unescaped quote will not
cause an error.</p>
<p>If not specified, the specification compliant default of
<code>true</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.compiler. Parser.STRICT_WHITESPACE</code></td><td align="left" valign="center">
<p>If <code>false</code> the requirements for whitespace before an
attribute name will be relaxed so that the lack of whitespace will not
cause an error.</p>
<p>If not specified, the specification compliant default of
<code>true</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.runtime. BodyContentImpl.BUFFER_SIZE</code></td><td align="left" valign="center">
<p>The size (in characters) to use when creating a tag buffer.</p>
<p>If not specified, the default value of
<code>org.apache.jasper.Constants.DEFAULT_TAG_BUFFER_SIZE</code> (512)
will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.runtime. BodyContentImpl.LIMIT_BUFFER</code></td><td align="left" valign="center">
<p>If <code>true</code>, any tag buffer that expands beyond
<code>org.apache.jasper.runtime.BodyContentImpl.BUFFER_SIZE</code> will be
destroyed and a new buffer created.</p>
<p>If not specified, the default value of <code>false</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.runtime. JspFactoryImpl.USE_POOL</code></td><td align="left" valign="center">
<p>If <code>true</code>, a ThreadLocal <code>PageContext</code> pool will
be used.</p>
<p>If not specified, the default value of <code>true</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.runtime. JspFactoryImpl.POOL_SIZE</code></td><td align="left" valign="center">
<p>The size of the ThreadLocal <code>PageContext</code>.</p>
<p>If not specified, the default value of <code>8</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.Constants. JSP_SERVLET_BASE</code></td><td align="left" valign="center">
<p>The base class of the Servlets generated from the JSPs.</p>
<p>If not specified, the default value of
<code>org.apache.jasper.runtime.HttpJspBase</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.Constants. SERVICE_METHOD_NAME</code></td><td align="left" valign="center">
<p>The name of the service method called by the base class.</p>
<p>If not specified, the default value of <code>_jspService</code>
will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.Constants. SERVLET_CLASSPATH</code></td><td align="left" valign="center">
<p>The name of the ServletContext attribute that provides the classpath
for the JSP.</p>
<p>If not specified, the default value of
<code>org.apache.catalina.jsp_classpath</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.Constants. JSP_FILE</code></td><td align="left" valign="center">
<p>The name of the request attribute for <code>&lt;jsp-file&gt;</code>
element of a servlet definition. If present on a request, this overrides
the value returned by <code>request.getServletPath()</code> to select the
JSP page to be executed.</p>
<p>If not specified, the default value of
<code>org.apache.catalina.jsp_file</code> will be used.</p>
<p><strong>Deprecated:</strong> This will be removed in Tomcat 9.0.x
onwards. It is replaced by the use of the jspFile servlet initialisation
parameter</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.Constants. PRECOMPILE</code></td><td align="left" valign="center">
<p>The name of the query parameter that causes the JSP engine to just
pregenerate the servlet but not invoke it.</p>
<p>If not specified, the default value of <code>jsp_precompile</code>
will be used, as defined by JSP specification (JSP.11.4.2).</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.Constants. JSP_PACKAGE_NAME</code></td><td align="left" valign="center">
<p>The default package name for compiled jsp pages.</p>
<p>If not specified, the default value of <code>org.apache.jsp</code>
will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.Constants. TAG_FILE_PACKAGE_NAME</code></td><td align="left" valign="center">
<p>The default package name for tag handlers generated from tag files.</p>
<p>If not specified, the default value of <code>org.apache.jsp.tag</code>
will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.Constants. ALT_DD_ATTR</code></td><td align="left" valign="center">
<p>The servlet context attribute under which the alternate deployment
descriptor for this web application is stored.</p>
<p>If not specified, the default value of
<code>org.apache.catalina.deploy.alt_dd</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.Constants. TEMP_VARIABLE_NAME_PREFIX</code></td><td align="left" valign="center">
<p>Prefix to use for generated temporary variable names.</p>
<p>If not specified, the default value of <code>_jspx_temp</code>
will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.Constants. USE_INSTANCE_MANAGER_FOR_TAGS</code></td><td align="left" valign="center">
<p>If <code>true</code>, the instance manager is used to obtain tag
handler instances.</p>
<p>If not specified, the default value of <code>false</code> will be used.</p>
</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="Security"><strong>Security</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Property</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina.connector. RECYCLE_FACADES</code></td><td align="left" valign="center">
<p>If this is <code>true</code> or if a security manager is in use a new
facade object will be created for each request.</p>
<p>If not specified, the default value of <code>false</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina.connector. CoyoteAdapter.ALLOW_BACKSLASH</code></td><td align="left" valign="center">
<p>If this is <code>true</code> the '\' character will be permitted as a
path delimiter.</p>
<p>If not specified, the default value of <code>false</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat.util.buf. UDecoder.ALLOW_ENCODED_SLASH</code></td><td align="left" valign="center">
<p>Use of this system property is deprecated. It will be removed from
Tomcat 10 onwards.</p>
<p>If this system property is set to <code>true</code>, the default for
the <code>encodedSolidusHandling</code> attribute of all Connectors will
be changed from <code>reject</code> to <code>decode</code>. If decoded, it
will be treated a path delimiter.</p>
</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="Specification"><strong>Specification</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Property</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina. STRICT_SERVLET_COMPLIANCE</code></td><td align="left" valign="center">
<p>The default value of this system property is <code>false</code>.</p>
<p>If this is <code>true</code> the default values will be changed for:</p>
<ul>
<li><code>org.apache.catalina.core.<br>ApplicationContext.GET_RESOURCE_REQUIRE_SLASH</code></li>
<li><code>org.apache.catalina.core.<br>ApplicationDispatcher.WRAP_SAME_OBJECT</code></li>
<li><code>org.apache.catalina.core.<br>StandardHostValve.ACCESS_SESSION</code></li>
<li><code>org.apache.catalina.session.<br>StandardSession.ACTIVITY_CHECK</code></li>
<li><code>org.apache.catalina.session.<br>StandardSession.LAST_ACCESS_AT_START</code></li>
<li><code>org.apache.tomcat.util.http.<br>ServerCookie.ALWAYS_ADD_EXPIRES</code></li>
<li><code>org.apache.tomcat.util.http.<br>ServerCookie.FWD_SLASH_IS_SEPARATOR</code></li>
<li><code>org.apache.tomcat.util.http.<br>ServerCookie.PRESERVE_COOKIE_HEADER</code></li>
<li><code>org.apache.tomcat.util.http.<br>ServerCookie.STRICT_NAMING</code></li>
<li>The <code>resourceOnlyServlets</code> attribute of any
<a href="context.html">Context</a> element.</li>
<li>The <code>tldValidation</code> attribute of any
<a href="context.html">Context</a> element.</li>
<li>The <code>useRelativeRedirects</code> attribute of any
<a href="context.html">Context</a> element.</li>
<li>The <code>xmlNamespaceAware</code> attribute of any
<a href="context.html">Context</a> element.</li>
<li>The <code>xmlValidation</code> attribute of any
<a href="context.html">Context</a> element.</li>
</ul>
<p>Note that changing a number of the above defaults is likely to break
the majority of systems as some browsers are unable to correctly handle
the cookie headers that result from a strict adherence to the
specifications. Defaults, regardless of whether or not they have been
changed by setting
<code>org.apache.catalina.STRICT_SERVLET_COMPLIANCE</code> can always be
overridden by explicitly setting the appropriate system property or element
attribute.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina.connector. Response.ENFORCE_ENCODING_IN_GET_WRITER</code></td><td align="left" valign="center">
<p>If this is <code>true</code> then
a call to <code>Response.getWriter()</code> if no character encoding
has been specified will result in subsequent calls to
<code>Response.getCharacterEncoding()</code> returning
<code>ISO-8859-1</code> and the <code>Content-Type</code> response header
will include a <code>charset=ISO-8859-1</code> component. (SRV.15.2.22.1)</p>
<p>If not specified, the default specification compliant value of
<code>true</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina.core.ApplicationContext .GET_RESOURCE_REQUIRE_SLASH</code></td><td align="left" valign="center">
<p>If this is <code>true</code> then the path passed to
<code>ServletContext.getResource()</code> or
<code>ServletContext.getResourceAsStream()</code> must start with
"/". If <code>false</code>, code like
<code>getResource("myfolder/myresource.txt")</code> will work.</p>
<p>If <code>org.apache.catalina.STRICT_SERVLET_COMPLIANCE</code> is set to
<code>true</code>, the default of this setting will be <code>true</code>,
else the default value will be <code>false</code>.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina.core. ApplicationDispatcher.WRAP_SAME_OBJECT</code></td><td align="left" valign="center">
<p>If this is <code>true</code> then any wrapped request or response
object passed to an application dispatcher will be checked to ensure that
it has wrapped the original request or response.</p>
<p>If <code>org.apache.catalina.STRICT_SERVLET_COMPLIANCE</code> is set to
<code>true</code>, the default of this setting will be <code>true</code>,
else the default value will be <code>false</code>.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat.util.http. ServerCookie.ALLOW_EQUALS_IN_VALUE</code></td><td align="left" valign="center">
<p>If this is <code>true</code> Tomcat will allow '<code>=</code>'
characters when parsing unquoted cookie values. If <code>false</code>,
cookie values containing '<code>=</code>' will be terminated when the
'<code>=</code>' is encountered and the remainder of the cookie value will
be dropped.</p>
<p>If not specified, the default value specification compliant value of
<code>false</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat.util.http. ServerCookie.ALLOW_HTTP_SEPARATORS_IN_V0</code></td><td align="left" valign="center">
<p>If this is <code>true</code> Tomcat will allow HTTP separators in
cookie names and values.</p>
<p>If not specified, the default specification compliant value of
<code>false</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat.util.http. ServerCookie.ALLOW_NAME_ONLY</code></td><td align="left" valign="center">
<p>If this is <code>false</code> then the requirements of the cookie
specifications that cookies must have values will be enforced and cookies
consisting only of a name but no value will be ignored.</p>
<p>If not specified, the default specification compliant value of
<code>false</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat.util.http. ServerCookie.ALWAYS_ADD_EXPIRES</code></td><td align="left" valign="center">
<p>If this is <code>true</code> Tomcat will always add an expires
parameter to a SetCookie header even for cookies with version greater than
zero. This is to work around a known IE6 and IE7 bug that causes IE to
ignore the Max-Age parameter in a SetCookie header.</p>
<p>If <code>org.apache.catalina.STRICT_SERVLET_COMPLIANCE</code> is set to
<code>true</code>, the default of this setting will be <code>false</code>,
else the default value will be <code>true</code>.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat.util.http. ServerCookie.FWD_SLASH_IS_SEPARATOR</code></td><td align="left" valign="center">
<p> If this is true then the <code>/</code> (forward slash) character will
be treated as a separator. Note that this character is frequently used in
cookie path attributes and some browsers will fail to process a cookie if
the path attribute is quoted as is required by a strict adherence to the
specifications. This is highly likely to break session tracking using
cookies.</p>
<p>If <code>org.apache.catalina.STRICT_SERVLET_COMPLIANCE</code> is set to
<code>true</code>, the default of this setting will be <code>true</code>,
else the default value will be <code>false</code>.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat.util.http. ServerCookie.PRESERVE_COOKIE_HEADER</code></td><td align="left" valign="center">
<p>If this is <code>true</code> Tomcat will ensure that cookie
processing does not modify cookie header returned by
<code>HttpServletRequest.getHeader()</code>.</p>
<p>If <code>org.apache.catalina.STRICT_SERVLET_COMPLIANCE</code> is set to
<code>true</code>, the default of this setting will be <code>true</code>,
else the default value will be <code>false</code>.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat.util.http. ServerCookie.STRICT_NAMING</code></td><td align="left" valign="center">
<p> If this is true then the requirements of the Servlet specification
that Cookie names must adhere to RFC2109 (no use of separators) will be
enforced.</p>
<p>If <code>org.apache.catalina.STRICT_SERVLET_COMPLIANCE</code> is set to
<code>true</code>, the default of this setting will be <code>true</code>,
else the default value will be <code>false</code>.</p>
</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="Sessions"><strong>Sessions</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Property</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina.authenticator. Constants.SSO_SESSION_COOKIE_NAME</code></td><td align="left" valign="center">
<p>An alternative name for the single sign on session cookie. Defaults to
<code>JSESSIONIDSSO</code>.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina.core. StandardHostValve.ACCESS_SESSION</code></td><td align="left" valign="center">
<p>If this is <code>true</code>, every request that is associated with a
session will cause the session's last accessed time to be updated
regardless of whether or not the request explicitly accesses the session.</p>
<p>If <code>org.apache.catalina.STRICT_SERVLET_COMPLIANCE</code> is set to
<code>true</code>, the default of this setting will be <code>true</code>,
else the default value will be <code>false</code>.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina.session. StandardSession.ACTIVITY_CHECK</code></td><td align="left" valign="center">
<p>If this is <code>true</code>, Tomcat will track the number of active
requests for each session. When determining if a session is valid, any
session with at least one active request will always be considered valid.</p>
<p>If <code>org.apache.catalina.STRICT_SERVLET_COMPLIANCE</code> is set to
<code>true</code>, the default of this setting will be <code>true</code>,
else the default value will be <code>false</code>.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina.session. StandardSession.LAST_ACCESS_AT_START</code></td><td align="left" valign="center">
<p>If this is <code>true</code>, the last accessed time for sessions will
be calculated from the beginning of the previous request. If
<code>false</code>, the last accessed time for sessions will be calculated
from the end of the previous request. This also affects how the idle time
is calculated.</p>
<p>If <code>org.apache.catalina.STRICT_SERVLET_COMPLIANCE</code> is set to
<code>true</code>, the default of this setting will be <code>true</code>,
else the default value will be <code>false</code>.</p>
</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="Logging"><strong>Logging</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Property</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.juli.formatter</code></td><td align="left" valign="center">
<p>If no logging configuration file is specified and no logging configuration class is specified
using the <code>java.util.logging.config.class</code> and <code>java.util.logging.config.file</code>
properties the default logging framework <code>org.apache.juli</code> will use the default
<code>java.util.logging.SimpleFormatter</code> for all console output.
To simply override the console output formatter, one can use the described property. Example:
<code>-Dorg.apache.juli.formatter=org.apache.juli.OneLineFormatter</code></p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.juli. AsyncOverflowDropType</code></td><td align="left" valign="center">
<p>When the memory limit of records has been reached the system needs to determine what action to take.
Currently there are three actions that can be taken:
</p>
<ul>
<li><code>int OVERFLOW_DROP_LAST = 1</code> - the record that caused the overflow will be dropped and not logged</li>
<li><code>int OVERFLOW_DROP_FIRST = 2</code> - the record that is next in line to be logged will be dropped to make room for the latest record on the queue</li>
<li><code>int OVERFLOW_DROP_FLUSH = 3</code> - suspend the thread while the queue empties out and flushes the entries to the write buffer</li>
<li><code>int OVERFLOW_DROP_CURRENT = 4</code> - drop the current log entry</li>
</ul>
<p>The default value is <code>1</code> (OVERFLOW_DROP_LAST).</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.juli. AsyncMaxRecordCount</code></td><td align="left" valign="center">
<p>The max number of log records that the async logger will keep in memory. When this limit is reached and a new record is being logged by the
JULI framework the system will take an action based on the <code>org.apache.juli.AsyncOverflowDropType</code> setting.</p>
<p>The default value is <code>10000</code> records.
This number represents the global number of records, not on a per handler basis.
</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.juli. AsyncLoggerPollInterval</code></td><td align="left" valign="center">
<p>The poll interval in milliseconds for the asynchronous logger thread in milliseconds.
If the log queue is empty, the async thread will issue a poll(poll interval)
in order to not wake up too often.</p>
<p>The default value is <code>1000</code> milliseconds.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.juli.logging. UserDataHelper.CONFIG</code></td><td align="left" valign="center">
<p>The type of logging to use for errors generated by invalid input data.
The options are: <code>DEBUG_ALL</code>, <code>INFO_THEN_DEBUG</code>,
<code>INFO_ALL</code> and <code>NONE</code>. When
<code>INFO_THEN_DEBUG</code> is used, the period for which errors are
logged at DEBUG rather than INFO is controlled by the system property
<code>org.apache.juli.logging.UserDataHelper.SUPPRESSION_TIME</code>.
</p>
<p>The default value is <code>INFO_THEN_DEBUG</code>.</p>
<p>The errors currently logged using this system are:</p>
<ul>
<li>invalid cookies;</li>
<li>invalid parameters;</li>
<li>too many headers, too many parameters (hitting
<code>maxHeaderCount</code> or <code>maxParameterCount</code> limits
of a <a href="http.html">connector</a>).</li>
<li>invalid host names</li>
</ul>
<p>Other errors triggered by invalid input data may be added to this
system in later versions.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.juli.logging. UserDataHelper.SUPPRESSION_TIME</code></td><td align="left" valign="center">
<p>When using <code>INFO_THEN_DEBUG</code> for
<code>org.apache.juli.logging.UserDataHelper.CONFIG</code> this system
property controls how long messages are logged at DEBUG after a message
has been logged at INFO. Once this period has elapsed, the next message
will be logged at INFO followed by a new suppression period where
messages are logged at DEBUG and so on. The value is measured
in seconds.</p>
<p>A value of <code>0</code> is equivalent to using <code>INFO_ALL</code>
for <code>org.apache.juli.logging.UserDataHelper.CONFIG</code>.</p>
<p>A negative value means an infinite suppression period.</p>
<p>The default value is <code>86400</code> (24 hours).</p>
</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="JAR Scanning"><!--()--></a><a name="JAR_Scanning"><strong>JAR Scanning</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Property</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="propertyName">tomcat.util.scan. DefaultJarScanner.jarsToSkip</code></td><td align="left" valign="center">
<p>The comma-separated list of file name patterns of JARs that Tomcat will
not scan for configuration information when using the
<a href="jar-scanner.html">JarScanner</a> functionality. The file name
pattern syntax is described in
<a href="jar-scanner.html">JarScanner</a> documentation. Note that
there are additional system properties that enable JARs to be excluded
from specific scans rather than all scans.</p>
<p>The coded default is that no JARs are skipped however the system
property is set in a default Tomcat installation via the
<code>$CATALINA_BASE/conf/catalina.properties</code> file.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina.startup. ContextConfig.jarsToSkip</code></td><td align="left" valign="center">
<p>The comma-separated list of additional filenames of JARs that Tomcat
will not scan for Servlet 3.0 pluggability features.</p>
<p>The coded default is that no JARs are skipped however the system
property is set in a default Tomcat installation via the
<code>$CATALINA_BASE/conf/catalina.properties</code> file.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina.startup. TldConfig.jarsToSkip</code></td><td align="left" valign="center">
<p>The comma-separated list of additional filenames of JARs that Tomcat
will not scan for TLDs.</p>
<p>The coded default is that no JARs are skipped however the system
property is set in a default Tomcat installation via the
<code>$CATALINA_BASE/conf/catalina.properties</code> file.</p>
</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="Websockets"><strong>Websockets</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Property</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat .websocket.ALLOW_UNSUPPORTED_EXTENSIONS</code></td><td align="left" valign="center">
<p>If <code>true</code>, allow unknown extensions to be declared by
the user.</p>
<p>The default value is <code>false</code>.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat. websocket.DEFAULT_BUFFER_SIZE</code></td><td align="left" valign="center">
<p>The default size for buffers used in the Websockets container.</p>
<p>The default value is <code>8192</code> which corresponds to 8KB.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat. websocket.DEFAULT_ORIGIN_HEADER_VALUE</code></td><td align="left" valign="center">
<p>Default value of the origin header that will be sent by the client
during the upgrade handshake.</p>
<p>The default is null so that no origin header is sent.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat. websocket.DEFAULT_PROCESS_PERIOD</code></td><td align="left" valign="center">
<p>The number of periodic ticks between periodic processing which
involves in particular session expiration checks.</p>
<p>The default value is <code>10</code> which corresponds to 10
seconds.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat. websocket.DISABLE_BUILTIN_EXTENSIONS</code></td><td align="left" valign="center">
<p>If <code>true</code>, disable all built-in extensions provided by the
server, such as message compression.</p>
<p>The default value is <code>false</code>.</p>
</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="Other"><strong>Other</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Property</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.coyote. USE_CUSTOM_STATUS_MSG_IN_HEADER</code></td><td align="left" valign="center"><p>If this is
<code>true</code>, custom HTTP status messages will be used within HTTP
headers. If a custom message is specified that is not valid for use in an
HTTP header (as defined by RFC2616) then the custom message will be
ignored and the default message used.</p>
<p>If not specified, the default value of <code>false</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">catalina.useNaming</code></td><td align="left" valign="center">
<p>If this is <code>false</code> it will override the
<code>useNaming</code> attribute for all <a href="context.html">
Context</a> elements.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">javax.sql.DataSource.Factory</code></td><td align="left" valign="center">
<p>The class name of the factory to use to create resources of type
<code>javax.sql.DataSource</code>. If not specified the default of
<code>org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory</code> is used
which is a package renamed (to avoid conflicts) copy of
<a href="https://commons.apache.org/dbcp">Apache Commons DBCP 1.x</a>.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">javax.mail.Session.Factory</code></td><td align="left" valign="center">
<p>The class name of the factory to use to create resources of type
<code>javax.mail.Session</code>. If not specified the default of
<code>org.apache.naming.factory.MailSessionFactory</code> is used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">jvmRoute</code></td><td align="left" valign="center">
<p>Provides a default value for the <code>jvmRoute</code> attribute of the
<a href="engine.html">Engine</a> element. It does not override the value
configured on the <a href="engine.html">Engine</a> element.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">catalina.config</code></td><td align="left" valign="center">
<p>The URL for the catalina.properties configuration file.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">tomcat.util.buf.StringCache.byte.enabled</code></td><td align="left" valign="center">
<p>If <code>true</code>, the String cache is enabled for
<code>ByteChunk</code>.</p>
<p>If not specified, the default value of <code>false</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">tomcat.util.buf.StringCache.char.enabled</code></td><td align="left" valign="center">
<p>If <code>true</code>, the String cache is enabled for
<code>CharChunk</code>.</p>
<p>If not specified, the default value of <code>false</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">tomcat.util.buf.StringCache.trainThreshold</code></td><td align="left" valign="center">
<p>The number of times <code>toString()</code> must be called before the
cache is activated.</p>
<p>If not specified, the default value of <code>20000</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">tomcat.util.buf.StringCache.cacheSize</code></td><td align="left" valign="center">
<p>The size of the String cache.</p>
<p>If not specified, the default value of <code>200</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">tomcat.util.buf.StringCache.maxStringSize</code></td><td align="left" valign="center">
<p>The maximum length of String that will be cached.</p>
<p>If not specified, the default value of <code>128</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat.util. http.FastHttpDateFormat.CACHE_SIZE</code></td><td align="left" valign="center">
<p>The size of the cache to use parsed and formatted date value.</p>
<p>If not specified, the default value of <code>1000</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat.util. net.NioSelectorShared</code></td><td align="left" valign="center">
<p>If <code>true</code>, use a shared selector for servlet write/read.</p>
<p>If not specified, the default value of <code>true</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina.startup. EXIT_ON_INIT_FAILURE</code></td><td align="left" valign="center">
<p>If <code>true</code>, the server will exit if an exception happens
during the server initialization phase.</p>
<p>If not specified, the default value of <code>false</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina.startup. RealmRuleSet.MAX_NESTED_REALM_LEVELS</code></td><td align="left" valign="center">
<p>The CombinedRealm allows nested Realms. This property controls the
maximum permitted number of levels of nesting.</p>
<p>If not specified, the default value of <code>3</code> will be used.</p>
</td></tr><tr><td align="left" valign="center"><code class="propertyName">tomcat.util.http.parser.HttpParser. requestTargetAllow</code></td><td align="left" valign="center">
<p><i>This system property is deprecated. Use the
<code>relaxedPathChars</code> and <code>relaxedQueryChars</code>
attributes of the Connector instead. These attributes permit a wider range
of characters to be configured as valid.</i></p>
<p>A string comprised of characters the server should allow even when they are not encoded.
These characters would normally result in a 400 status.</p>
<p>The acceptable characters for this property are: <code>|</code>, <code>{</code>
, and <code>}</code></p>
<p><strong>WARNING</strong>: Use of this option may expose the server to CVE-2016-6816.
</p>
<p>If not specified, the default value of <code>null</code> will be used.</p>
</td></tr></table>
</blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr noshade size="1"></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font color="#525D76" size="-1"><em>
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