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<html lang="en"><head><META http-equiv="Content-Type" content="text/html; charset=UTF-8"><link href="../images/docs-stylesheet.css" rel="stylesheet" type="text/css"><title>Apache Tomcat 8 Configuration Reference (8.5.97) - System Properties</title></head><body><div id="wrapper"><header><div id="header"><div><div><div class="logo noPrint"><a href="https://tomcat.apache.org/"><img alt="Tomcat Home" src="../images/tomcat.png"></a></div><div style="height: 1px;"></div><div class="asfLogo noPrint"><a href="https://www.apache.org/" target="_blank"><img src="../images/asf-logo.svg" alt="The Apache Software Foundation" style="width: 266px; height: 83px;"></a></div><h1>Apache Tomcat 8 Configuration Reference</h1><div class="versionInfo">
Version 8.5.97,
<time datetime="2023-12-07">Dec 7 2023</time></div><div style="height: 1px;"></div><div style="clear: left;"></div></div></div></div></header><div id="middle"><div><div id="mainLeft" class="noprint"><div><nav><div><h2>Links</h2><ul><li><a href="../index.html">Docs Home</a></li><li><a href="index.html">Config Ref. Home</a></li><li><a href="https://cwiki.apache.org/confluence/display/TOMCAT/FAQ">FAQ</a></li><li><a href="#comments_section">User Comments</a></li></ul></div><div><h2>Top Level Elements</h2><ul><li><a href="server.html">Server</a></li><li><a href="service.html">Service</a></li></ul></div><div><h2>Executors</h2><ul><li><a href="executor.html">Executor</a></li></ul></div><div><h2>Connectors</h2><ul><li><a href="http.html">HTTP/1.1</a></li><li><a href="http2.html">HTTP/2</a></li><li><a href="ajp.html">AJP</a></li></ul></div><div><h2>Containers</h2><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></div><div><h2>Nested Components</h2><ul><li><a href="cookie-processor.html">CookieProcessor</a></li><li><a href="credentialhandler.html">CredentialHandler</a></li><li><a href="globalresources.html">Global Resources</a></li><li><a href="jar-scanner.html">JarScanner</a></li><li><a href="jar-scan-filter.html">JarScanFilter</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></div><div><h2>Cluster Elements</h2><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></div><div><h2>web.xml</h2><ul><li><a href="filter.html">Filter</a></li></ul></div><div><h2>Other</h2><ul><li><a href="systemprops.html">System properties</a></li><li><a href="jaspic.html">JASPIC</a></li></ul></div></nav></div></div><div id="mainRight"><div id="content"><h2>System Properties</h2><h3 id="Table_of_Contents">Table of Contents</h3><div class="text">
<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="#Specifications">Specifications</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>
</div><h3 id="Introduction">Introduction</h3><div class="text">
<p>The following sections list the system properties that may be set to modify
the default Tomcat behaviour.</p>
</div><h3 id="Property_replacements">Property replacements</h3><div class="text">
<table class="defaultTable"><tr><th style="width: 15%;">
Property
</th><th style="width: 85%;">
Description
</th></tr><tr><td><code class="propertyName">org.apache.tomcat.util.digester. PROPERTY_SOURCE</code></td><td>
<p>Set this to a comma separated list of fully qualified name of classes
that implement
<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>Property replacement from the specified property source on the JVM
system properties can also be done using the
<code>REPLACE_SYSTEM_PROPERTIES</code> system property.</p>
<p><code>org.apache.tomcat.util.digester.ServiceBindingPropertySource</code>
can be used to replace parameters from any Kubernetes service bindings
that follows the <a href="https://servicebinding.io/">servicebinding.io</a> spec</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>
<p><code>org.apache.tomcat.util.digester.SystemPropertySource</code>
does replacement with system properties. It is always enabled,
but can also be specified as part of the property value.</p>
</td></tr><tr><td><code class="propertyName">org.apache.tomcat.util.digester. REPLACE_SYSTEM_PROPERTIES</code></td><td>
<p>Set this boolean system property to <code>true</code> to cause
property replacement from the digester property source on the JVM
system properties.</p>
</td></tr></table>
</div><h3 id="Clustering">Clustering</h3><div class="text">
<table class="defaultTable"><tr><th style="width: 15%;">
Property
</th><th style="width: 85%;">
Description
</th></tr><tr><td><code class="propertyName">org.apache.catalina. tribes.dns_lookups</code></td><td>
<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>
</div><h3 id="Expression_Language">Expression Language</h3><div class="text">
<table class="defaultTable"><tr><th style="width: 15%;">
Property
</th><th style="width: 85%;">
Description
</th></tr><tr><td><code class="propertyName">org.apache.el. GET_CLASSLOADER_USE_PRIVILEGED</code></td><td>
<p>Controls whether the EL API classes make use of a privileged block to
obtain the thread context class loader. When using the EL API within
Apache Tomcat this does not need to be set as all calls are already
wrapped in a privileged block further up the stack. It may be required if
using the EL API under a SecurityManager outside of Apache Tomcat.</p>
<p>If not specified, the default of <code>false</code> will be used.</p>
</td></tr><tr><td><code class="propertyName">org.apache.el.BeanELResolver. CACHE_SIZE</code></td><td>
<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><code class="propertyName">org.apache.el.ExpressionBuilder. CACHE_SIZE</code></td><td>
<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><code class="propertyName">org.apache.el.parser. COERCE_TO_ZERO</code></td><td>
<p>If <code>true</code>, when coercing <code>null</code>s to objects of
type Number, Character or Boolean the result will be <code>0</code> for
Number and Character types and <code>false</code> for Boolean as required
by the EL 2.2 and earlier specifications. If this property is
<code>false</code> the result of the coercion will be <code>null</code> as
required by the EL 3.0 specification.</p>
<p>If not specified, the default value of <code>false</code> will be
used.</p>
</td></tr><tr><td><code class="propertyName">org.apache.el.parser. SKIP_IDENTIFIER_CHECK</code></td><td>
<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>
</div><h3 id="Jasper">Jasper</h3><div class="text">
<table class="defaultTable"><tr><th style="width: 15%;">
Property
</th><th style="width: 85%;">
Description
</th></tr><tr><td><code class="propertyName">org.apache.jasper.compiler. Generator.POOL_TAGS_WITH_EXTENDS</code></td><td>
<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><code class="propertyName">org.apache.jasper.compiler. Generator.STRICT_GET_PROPERTY</code></td><td>
<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><code class="propertyName">org.apache.jasper.compiler. Generator.VAR_EXPRESSIONFACTORY</code></td><td>
<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><code class="propertyName">org.apache.jasper.compiler. Generator.VAR_INSTANCEMANAGER</code></td><td>
<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><code class="propertyName">org.apache.jasper.compiler. Parser.STRICT_WHITESPACE</code></td><td>
<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><code class="propertyName">org.apache.jasper.runtime. BodyContentImpl.BUFFER_SIZE</code></td><td>
<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><code class="propertyName">org.apache.jasper.runtime. BodyContentImpl.LIMIT_BUFFER</code></td><td>
<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><code class="propertyName">org.apache.jasper.runtime. JspFactoryImpl.USE_POOL</code></td><td>
<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><code class="propertyName">org.apache.jasper.runtime. JspFactoryImpl.POOL_SIZE</code></td><td>
<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><code class="propertyName">org.apache.jasper.Constants. JSP_SERVLET_BASE</code></td><td>
<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><code class="propertyName">org.apache.jasper.Constants. SERVICE_METHOD_NAME</code></td><td>
<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><code class="propertyName">org.apache.jasper.Constants. SERVLET_CLASSPATH</code></td><td>
<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><code class="propertyName">org.apache.jasper.Constants. JSP_FILE</code></td><td>
<p>The name of the request attribute for <code><jsp-file></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><code class="propertyName">org.apache.jasper.Constants. PRECOMPILE</code></td><td>
<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><code class="propertyName">org.apache.jasper.Constants. JSP_PACKAGE_NAME</code></td><td>
<p>The default package name for compiled JSPs.</p>
<p>If not specified, the default value of <code>org.apache.jsp</code>
will be used.</p>
</td></tr><tr><td><code class="propertyName">org.apache.jasper.Constants. TAG_FILE_PACKAGE_NAME</code></td><td>
<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><code class="propertyName">org.apache.jasper.Constants. ALT_DD_ATTR</code></td><td>
<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><code class="propertyName">org.apache.jasper.Constants. TEMP_VARIABLE_NAME_PREFIX</code></td><td>
<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><code class="propertyName">org.apache.jasper.Constants. USE_INSTANCE_MANAGER_FOR_TAGS</code></td><td>
<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>
</div><h3 id="Security">Security</h3><div class="text">
<table class="defaultTable"><tr><th style="width: 15%;">
Property
</th><th style="width: 85%;">
Description
</th></tr><tr><td><code class="propertyName">org.apache.catalina.connector. RECYCLE_FACADES</code></td><td>
<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><code class="propertyName">org.apache.catalina.connector. CoyoteAdapter.ALLOW_BACKSLASH</code></td><td>
<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><code class="propertyName">org.apache.tomcat.util.buf. UDecoder.ALLOW_ENCODED_SLASH</code></td><td>
<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>
</div><h3 id="Specifications">Specifications</h3><div class="text">
<table class="defaultTable"><tr><th style="width: 15%;">
Property
</th><th style="width: 85%;">
Description
</th></tr><tr><td><code class="propertyName">org.apache.catalina. STRICT_SERVLET_COMPLIANCE</code></td><td>
<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.STRICT_NAMING</code></li>
<li>The <code>URIEncoding</code> attribute of any
<a href="http.html">HTTP connector</a> or
<a href="ajp.html">AJP connector</a> element.</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>
</td></tr><tr><td><code class="propertyName">org.apache.catalina.connector. Response.ENFORCE_ENCODING_IN_GET_WRITER</code></td><td>
<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><code class="propertyName">org.apache.catalina.core.ApplicationContext .GET_RESOURCE_REQUIRE_SLASH</code></td><td>
<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 as Tomcat
will prepend "/" to the provided path.</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><code class="propertyName">org.apache.catalina.core. ApplicationDispatcher.WRAP_SAME_OBJECT</code></td><td>
<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><code class="propertyName">org.apache.tomcat.websocket. STRICT_SPEC_COMPLIANCE</code></td><td>
<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.tomcat.websocket.server#isEnforceNoAddAfterHandshake</code>
(default changes from <code>false</code> to <code>true</code>)</li>
</ul>
</td></tr><tr><td><code class="propertyName">org.apache.tomcat.util.http. ServerCookie.STRICT_NAMING</code></td><td>
<p> If this is <code>true</code> then the requirements of the Servlet specification
that Cookie names must adhere to RFC2109 will be enforced. If this is
<code>false</code> the naming rules specified in RFC6265 (allow the leading "$")
will be used.</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>
</div><h3 id="Sessions">Sessions</h3><div class="text">
<table class="defaultTable"><tr><th style="width: 15%;">
Property
</th><th style="width: 85%;">
Description
</th></tr><tr><td><code class="propertyName">org.apache.catalina.authenticator. Constants.SSO_SESSION_COOKIE_NAME</code></td><td>
<p>An alternative name for the single sign on session cookie. Defaults to
<code>JSESSIONIDSSO</code>.</p>
</td></tr><tr><td><code class="propertyName">org.apache.catalina.core. StandardHostValve.ACCESS_SESSION</code></td><td>
<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><code class="propertyName">org.apache.catalina.session. StandardSession.ACTIVITY_CHECK</code></td><td>
<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><code class="propertyName">org.apache.catalina.session. StandardSession.LAST_ACCESS_AT_START</code></td><td>
<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>
</div><h3 id="Logging">Logging</h3><div class="text">
<table class="defaultTable"><tr><th style="width: 15%;">
Property
</th><th style="width: 85%;">
Description
</th></tr><tr><td><code class="propertyName">org.apache.juli.formatter</code></td><td>
<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><code class="propertyName">org.apache.juli. AsyncMaxRecordCount</code></td><td>
<p>The maximum number of log records that the JULI AsyncFileHandler will queue in memory.
New records are added to the queue and get asynchronously removed from the queue
and written to the files by a single writer thread.
When the queue is full and a new record is being logged
the log record will be handled 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><code class="propertyName">org.apache.juli. AsyncOverflowDropType</code></td><td>
<p>When the queue of log records of the JULI AsyncFileHandler is full,
new log records are handled according to the following setting:
</p>
<ul>
<li><code>1</code> - the newest record in the queue will be dropped and not logged</li>
<li><code>2</code> - the oldest record in the queue will be dropped and not logged</li>
<li><code>3</code> - suspend the logging thread until older records got written to the log file and the queue is no longer full.
This is the only setting that ensures that no messages get lost.</li>
<li><code>4</code> - drop the current log record</li>
</ul>
<p>The default value is <code>1</code> (drop the newest record in the queue).</p>
</td></tr><tr><td><code class="propertyName">org.apache.juli.logging. UserDataHelper.CONFIG</code></td><td>
<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>
<li>HTTP/2 stream closures</li>
</ul>
<p>Other errors triggered by invalid input data may be added to this
system in later versions.</p>
</td></tr><tr><td><code class="propertyName">org.apache.juli.logging. UserDataHelper.SUPPRESSION_TIME</code></td><td>
<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>
</div><h3 id="JAR_Scanning">JAR Scanning</h3><div class="text">
<table class="defaultTable"><tr><th style="width: 15%;">
Property
</th><th style="width: 85%;">
Description
</th></tr><tr><td><code class="propertyName">tomcat.util.scan. StandardJarScanFilter.jarsToSkip</code></td><td>
<p>A list of comma-separated file name patterns that is used as the default
value for <code>pluggabilitySkip</code> and <code>tldSkip</code>
attributes of the standard
<a href="jar-scan-filter.html">JarScanFilter</a> implementation.</p>
<p>The coded default is empty, however the system property is set in
a default Tomcat installation via the
<code>$CATALINA_BASE/conf/catalina.properties</code> file.</p>
</td></tr><tr><td><code class="propertyName">tomcat.util.scan. StandardJarScanFilter.jarsToScan</code></td><td>
<p>A list of comma-separated file name patterns that is used as the default
value for <code>pluggabilityScan</code> and <code>tldScan</code>
attributes of the standard
<a href="jar-scan-filter.html">JarScanFilter</a> implementation.</p>
<p>The coded default is empty, however the system property is set in
a default Tomcat installation via the
<code>$CATALINA_BASE/conf/catalina.properties</code> file.</p>
</td></tr></table>
</div><h3 id="Websockets">Websockets</h3><div class="text">
<table class="defaultTable"><tr><th style="width: 15%;">
Property
</th><th style="width: 85%;">
Description
</th></tr><tr><td><code class="propertyName">org.apache.tomcat. websocket.ALLOW_UNSUPPORTED_EXTENSIONS</code></td><td>
<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><code class="propertyName">org.apache.tomcat. websocket.DEFAULT_BUFFER_SIZE</code></td><td>
<p>The default size for buffers used in the Websockets container.</p>
<p>The default value is <code>8192</code> which corresponds to 8 KiB.</p>
</td></tr><tr><td><code class="propertyName">org.apache.tomcat. websocket.DEFAULT_ORIGIN_HEADER_VALUE</code></td><td>
<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><code class="propertyName">org.apache.tomcat. websocket.DEFAULT_PROCESS_PERIOD</code></td><td>
<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><code class="propertyName">org.apache.tomcat. websocket.DISABLE_BUILTIN_EXTENSIONS</code></td><td>
<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>
</div><h3 id="Other">Other</h3><div class="text">
<table class="defaultTable"><tr><th style="width: 15%;">
Property
</th><th style="width: 85%;">
Description
</th></tr><tr><td><code class="propertyName">org.apache.coyote. USE_CUSTOM_STATUS_MSG_IN_HEADER</code></td><td><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>
<p><strong>Note:</strong> This option is deprecated and will be removed
in Tomcat 9. The reason phrase will not be sent.</p>
</td></tr><tr><td><code class="propertyName">catalina.useNaming</code></td><td>
<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><code class="propertyName">javax.sql.DataSource.Factory</code></td><td>
<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.dbcp2.BasicDataSourceFactory</code> is used
which is a package renamed (to avoid conflicts) copy of
<a href="https://commons.apache.org/dbcp">Apache Commons DBCP 2</a>.</p>
</td></tr><tr><td><code class="propertyName">javax.mail.Session.Factory</code></td><td>
<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><code class="propertyName">jvmRoute</code></td><td>
<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><code class="propertyName">catalina.config</code></td><td>
<p>The URL for the catalina.properties configuration file.</p>
</td></tr><tr><td><code class="propertyName">tomcat.util.buf.StringCache.byte.enabled</code></td><td>
<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><code class="propertyName">tomcat.util.buf.StringCache.char.enabled</code></td><td>
<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><code class="propertyName">tomcat.util.buf.StringCache.trainThreshold</code></td><td>
<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><code class="propertyName">tomcat.util.buf.StringCache.cacheSize</code></td><td>
<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><code class="propertyName">org.apache.tomcat.util.buf.UriUtil. WAR_SEPARATOR</code></td><td>
<p>The character to use to separate the WAR file and WAR content parts of
a WAR URL using the custom WAR scheme provided by Tomcat. This is
equivalent to how <code>!</code> is used in JAR URLs.</p>
<p>If not specified, the default value of <code>*</code> will be used.</p>
</td></tr><tr><td><code class="propertyName">tomcat.util.buf.StringCache.maxStringSize</code></td><td>
<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><code class="propertyName">org.apache.tomcat.util. http.FastHttpDateFormat.CACHE_SIZE</code></td><td>
<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><code class="propertyName">org.apache.tomcat.util. net.NioSelectorShared</code></td><td>
<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><code class="propertyName">org.apache.catalina.startup. EXIT_ON_INIT_FAILURE</code></td><td>
<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><code class="propertyName">org.apache.catalina.startup. RealmRuleSet.MAX_NESTED_REALM_LEVELS</code></td><td>
<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><code class="propertyName">org.apache.catalina.startup. CredentialHandlerRuleSet.MAX_NESTED_LEVELS</code></td><td>
<p>The NestedCredentialHandler allows nested CredentialHandlers. 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><code class="propertyName">tomcat.util.http.parser.HttpParser. requestTargetAllow</code></td><td>
<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>
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