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Code Editor : systemprops.html

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</style></head><body bgcolor="#ffffff" text="#000000" link="#525D76" alink="#525D76" vlink="#525D76"><table border="0" width="100%" cellspacing="0"><tr><td><a href="https://tomcat.apache.org/"><img src="../images/tomcat.gif" align="right" alt="
 The Apache Tomcat Servlet/JSP Container
 " border="0"></a></td><td><h1>Apache Tomcat 7</h1>Version 7.0.107, Nov 18 2020</td><td><a href="http://www.apache.org/"><img src="../images/asf-logo.svg" align="right" alt="Apache Logo" border="0" style="width: 266px;height: 83px;"></a></td></tr></table><table border="0" width="100%" cellspacing="4"><tr><td colspan="2"><hr noshade size="1"></td></tr><tr><td width="20%" valign="top" nowrap class="noPrint">Links<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>Top Level Elements<ul><li><a href="server.html">Server</a></li><li><a href="service.html">Service</a></li></ul>Executors<ul><li><a href="executor.html">Executor</a></li></ul>Connectors<ul><li><a href="http.html">HTTP</a></li><li><a href="ajp.html">AJP</a></li></ul>Containers<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>Nested Components<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>Cluster Elements<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>web.xml<ul><li><a href="filter.html">Filter</a></li></ul>Other<ul><li><a href="systemprops.html">System properties</a></li></ul></td><td width="80%" valign="top" align="left" id="mainBody"><h1>System Properties</h1><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><a name="Table of Contents"></a><a name="Table_of_Contents">Table of Contents</a></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"><a name="Introduction">Introduction</a></td></tr><tr><td><blockquote>
 The following sections list the system properties that may be set to modify
 the default Tomcat behaviour.
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><a name="Property replacements"></a><a name="Property_replacements">Property replacements</a></td></tr><tr><td><blockquote>
 <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264">Property</th><th width="85%" bgcolor="#023264">Description</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">
 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.
 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.
 <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.
 </td></tr></table>

</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><a name="Clustering">Clustering</a></td></tr><tr><td><blockquote>
 <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264">Property</th><th width="85%" bgcolor="#023264">Description</th></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.catalina. tribes.dns_lookups</code></td><td align="left" valign="center">
 This system property is deprecated and will be removed without
 replacement in Apache Tomcat 10 onwards.
 If <code>true</code>, the clustering module will attempt to use DNS to
 resolve any host names provided in the cluster configuration.
 If not specified, the default value of <code>false</code> will be used.
 </td></tr></table>

</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><a name="Expression Language"></a><a name="Expression_Language">Expression Language</a></td></tr><tr><td><blockquote>
 <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264">Property</th><th width="85%" bgcolor="#023264">Description</th></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.el.BeanELResolver. CACHE_SIZE</code></td><td align="left" valign="center">
 The number of javax.el.BeanELResolver.BeanProperties objects that will
 be cached by the EL Parser.
 If not specified, the default of <code>1000</code> will be used.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.el.ExpressionBuilder. CACHE_SIZE</code></td><td align="left" valign="center">
 The number of parsed EL expressions that will be cached by the EL
 Parser.
 If not specified, the default of <code>5000</code> will be used.
 </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">
 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.
 If not specified, the default value of <code>true</code> will be used.
 </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">
 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.
 If not specified, the default value of <code>false</code> will be used.
 </td></tr></table>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><a name="Jasper">Jasper</a></td></tr><tr><td><blockquote>
 <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264">Property</th><th width="85%" bgcolor="#023264">Description</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">
 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.
 If not specified, the default value of <code>false</code> will be used.
 
 </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">
 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.
 If not specified, the specification compliant default of
 <code>true</code> will be used.
 </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">
 The name of the variable to use for the expression language expression
 factory.
 If not specified, the default value of <code>_el_expressionfactory</code>
 will be used.
 </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">
 The name of the variable to use for the instance manager factory.
 If not specified, the default value of <code>_jsp_instancemanager</code>
 will be used.
 </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">
 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.
 If not specified, the specification compliant default of
 <code>true</code> will be used.
 </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">
 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.
 If not specified, the specification compliant default of
 <code>true</code> will be used.
 </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">
 The size (in characters) to use when creating a tag buffer.
 If not specified, the default value of
 <code>org.apache.jasper.Constants.DEFAULT_TAG_BUFFER_SIZE</code> (512)
 will be used.
 </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">
 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.
 If not specified, the default value of <code>false</code> will be used.
 </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">
 If <code>true</code>, a ThreadLocal <code>PageContext</code> pool will
 be used.
 If not specified, the default value of <code>true</code> will be used.
 </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">
 The size of the ThreadLocal <code>PageContext</code>.
 If not specified, the default value of <code>8</code> will be used.
 </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">
 The base class of the Servlets generated from the JSPs.
 If not specified, the default value of
 <code>org.apache.jasper.runtime.HttpJspBase</code> will be used.
 </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">
 The name of the service method called by the base class.
 If not specified, the default value of <code>_jspService</code>
 will be used.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.Constants. SERVLET_CLASSPATH</code></td><td align="left" valign="center">
 The name of the ServletContext attribute that provides the classpath
 for the JSP.
 If not specified, the default value of
 <code>org.apache.catalina.jsp_classpath</code> will be used.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.Constants. JSP_FILE</code></td><td align="left" valign="center">
 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.
 If not specified, the default value of
 <code>org.apache.catalina.jsp_file</code> will be used.
 Deprecated: This will be removed in Tomcat 9.0.x
 onwards. It is replaced by the use of the jspFile servlet initialisation
 parameter
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.jasper.Constants. PRECOMPILE</code></td><td align="left" valign="center">
 The name of the query parameter that causes the JSP engine to just
 pregenerate the servlet but not invoke it.
 If not specified, the default value of <code>jsp_precompile</code>
 will be used, as defined by JSP specification (JSP.11.4.2).
 </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">
 The default package name for compiled jsp pages.
 If not specified, the default value of <code>org.apache.jsp</code>
 will be used.
 </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">
 The default package name for tag handlers generated from tag files.
 If not specified, the default value of <code>org.apache.jsp.tag</code>
 will be used.
 </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">
 The servlet context attribute under which the alternate deployment
 descriptor for this web application is stored.
 If not specified, the default value of
 <code>org.apache.catalina.deploy.alt_dd</code> will be used.
 </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">
 Prefix to use for generated temporary variable names.
 If not specified, the default value of <code>_jspx_temp</code>
 will be used.
 </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">
 If <code>true</code>, the instance manager is used to obtain tag
 handler instances.
 If not specified, the default value of <code>false</code> will be used.
 </td></tr></table>

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.
 </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">
 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)
 If not specified, the default specification compliant value of
 <code>true</code> will be used.
 </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">
 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.
 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>.
 </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">
 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.
 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>.
 </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">
 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.
 If not specified, the default value specification compliant value of
 <code>false</code> will be used.
 </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">
 If this is <code>true</code> Tomcat will allow HTTP separators in
 cookie names and values.
 If not specified, the default specification compliant value of
 <code>false</code> will be used.
 </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">
 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.
 If not specified, the default specification compliant value of
 <code>false</code> will be used.
 </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">
 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.
 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>.
 </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">
 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.
 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>.
 </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">
 If this is <code>true</code> Tomcat will ensure that cookie
 processing does not modify cookie header returned by
 <code>HttpServletRequest.getHeader()</code>.
 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>.
 </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">
 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.
 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>.
 </td></tr></table>

<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264">Property</th><th width="85%" bgcolor="#023264">Description</th></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.juli.formatter</code></td><td align="left" valign="center">
 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>
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.juli. AsyncOverflowDropType</code></td><td align="left" valign="center">
 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:
 
 <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>
 The default value is <code>1</code> (OVERFLOW_DROP_LAST).
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.juli. AsyncMaxRecordCount</code></td><td align="left" valign="center">
 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.
 The default value is <code>10000</code> records.
 This number represents the global number of records, not on a per handler basis.
 
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.juli. AsyncLoggerPollInterval</code></td><td align="left" valign="center">
 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.
 The default value is <code>1000</code> milliseconds.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.juli.logging. UserDataHelper.CONFIG</code></td><td align="left" valign="center">
 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>.
 
 The default value is <code>INFO_THEN_DEBUG</code>.
 The errors currently logged using this system are:
 <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>
 Other errors triggered by invalid input data may be added to this
 system in later versions.
 </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">
 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.
 A value of <code>0</code> is equivalent to using <code>INFO_ALL</code>
 for <code>org.apache.juli.logging.UserDataHelper.CONFIG</code>.
 A negative value means an infinite suppression period.
 The default value is <code>86400</code> (24 hours).
 </td></tr></table>

<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264">Property</th><th width="85%" bgcolor="#023264">Description</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">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.
 If not specified, the default value of <code>false</code> will be used.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">catalina.useNaming</code></td><td align="left" valign="center">
 If this is <code>false</code> it will override the
 <code>useNaming</code> attribute for all <a href="context.html">
 Context</a> elements.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">javax.sql.DataSource.Factory</code></td><td align="left" valign="center">
 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>.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">javax.mail.Session.Factory</code></td><td align="left" valign="center">
 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.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">jvmRoute</code></td><td align="left" valign="center">
 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.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">catalina.config</code></td><td align="left" valign="center">
 The URL for the catalina.properties configuration file.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">tomcat.util.buf.StringCache.byte.enabled</code></td><td align="left" valign="center">
 If <code>true</code>, the String cache is enabled for
 <code>ByteChunk</code>.
 If not specified, the default value of <code>false</code> will be used.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">tomcat.util.buf.StringCache.char.enabled</code></td><td align="left" valign="center">
 If <code>true</code>, the String cache is enabled for
 <code>CharChunk</code>.
 If not specified, the default value of <code>false</code> will be used.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">tomcat.util.buf.StringCache.trainThreshold</code></td><td align="left" valign="center">
 The number of times <code>toString()</code> must be called before the
 cache is activated.
 If not specified, the default value of <code>20000</code> will be used.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">tomcat.util.buf.StringCache.cacheSize</code></td><td align="left" valign="center">
 The size of the String cache.
 If not specified, the default value of <code>200</code> will be used.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">tomcat.util.buf.StringCache.maxStringSize</code></td><td align="left" valign="center">
 The maximum length of String that will be cached.
 If not specified, the default value of <code>128</code> will be used.
 </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">
 The size of the cache to use parsed and formatted date value.
 If not specified, the default value of <code>1000</code> will be used.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">org.apache.tomcat.util. net.NioSelectorShared</code></td><td align="left" valign="center">
 If <code>true</code>, use a shared selector for servlet write/read.
 If not specified, the default value of <code>true</code> will be used.
 </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">
 If <code>true</code>, the server will exit if an exception happens
 during the server initialization phase.
 If not specified, the default value of <code>false</code> will be used.
 </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">
 The CombinedRealm allows nested Realms. This property controls the
 maximum permitted number of levels of nesting.
 If not specified, the default value of <code>3</code> will be used.
 </td></tr><tr><td align="left" valign="center"><code class="propertyName">tomcat.util.http.parser.HttpParser. requestTargetAllow</code></td><td align="left" valign="center">
 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.
 A string comprised of characters the server should allow even when they are not encoded.
 These characters would normally result in a 400 status.
 The acceptable characters for this property are: <code>|</code>, <code>{</code>
 , and <code>}</code>
 WARNING: Use of this option may expose the server to CVE-2016-6816.
 
 If not specified, the default value of <code>null</code> will be used.
 </td></tr></table>

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