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<!DOCTYPE document [
  <!ENTITY project SYSTEM "project.xml">
]>
<document url="systemprops.html">

  &project;

  <properties>
    <title>System Properties</title>
  </properties>

<body>

<section name="Table of Contents">
<toc/>
</section>

<section name="Introduction">
  <p>The following sections list the system properties that may be set to modify
  the default Tomcat behaviour.</p>
</section>

<section name="Property replacements">
  <properties>
    <property name="org.apache.tomcat.util.digester. PROPERTY_SOURCE">
      <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}</code>
         denoted parameters are found in the XML files that Tomcat parses.</p>
    </property>
  </properties>

</section>

<section name="Clustering">
  <properties>

    <property name="org.apache.catalina. tribes.dns_lookups">
      <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>
    </property>

  </properties>

</section>

<section name="Expression Language">
  <properties>

    <property name="org.apache.el.BeanELResolver. CACHE_SIZE">
      <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>
    </property>

    <property name="org.apache.el.ExpressionBuilder. CACHE_SIZE">
      <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>
    </property>

    <property name="org.apache.el.parser. COERCE_TO_ZERO">
      <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>
    </property>

    <property name="org.apache.el.parser. SKIP_IDENTIFIER_CHECK">
      <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>
    </property>

  </properties>
</section>

<section name="Jasper">
  <properties>

    <property name="org.apache.jasper.compiler. Generator.POOL_TAGS_WITH_EXTENDS">
      <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>
    </property>

    <property name="org.apache.jasper.compiler. Generator.STRICT_GET_PROPERTY">
      <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>
    </property>

    <property name="org.apache.jasper.compiler. Generator.VAR_EXPRESSIONFACTORY">
      <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>
    </property>

    <property name="org.apache.jasper.compiler. Generator.VAR_INSTANCEMANAGER">
      <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>
    </property>

    <property name="org.apache.jasper.compiler. Parser.STRICT_QUOTE_ESCAPING">
      <p><strong>Deprecated</strong>. Configures the default setting for the
      <code>strictQuoteEscaping</code> JSP initialisation paramater.</p>
      <p>If not specified, the specification compliant default of
      <code>true</code> will be used.</p>
    </property>

    <property name="org.apache.jasper.compiler. Parser.STRICT_WHITESPACE">
      <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>
    </property>

    <property name="org.apache.jasper.runtime. BodyContentImpl.LIMIT_BUFFER">
      <p>If <code>true</code>, any tag buffer that expands beyond
      <code>org.apache.jasper.Constants.DEFAULT_TAG_BUFFER_SIZE</code> will be
      destroyed and a new buffer created of the default size.</p>
      <p>If not specified, the default value of <code>false</code> will be used.</p>
    </property>

    <property name="org.apache.jasper.runtime. JspFactoryImpl.USE_POOL">
      <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>
    </property>

    <property name="org.apache.jasper.runtime. JspFactoryImpl.POOL_SIZE">
      <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>
    </property>

    <property name="org.apache.jasper.Constants. JSP_SERVLET_BASE">
      <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>
    </property>

    <property name="org.apache.jasper.Constants. SERVICE_METHOD_NAME">
      <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>
    </property>

    <property name="org.apache.jasper.Constants. SERVLET_CLASSPATH">
      <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>
    </property>

    <property name="org.apache.jasper.Constants. JSP_FILE">
      <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>
    </property>

    <property name="org.apache.jasper.Constants. PRECOMPILE">
      <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>
    </property>

    <property name="org.apache.jasper.Constants. JSP_PACKAGE_NAME">
      <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>
    </property>

    <property name="org.apache.jasper.Constants. TAG_FILE_PACKAGE_NAME">
      <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>
    </property>

    <property name="org.apache.jasper.Constants. ALT_DD_ATTR">
      <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>
    </property>

    <property name="org.apache.jasper.Constants. TEMP_VARIABLE_NAME_PREFIX">
      <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>
    </property>

    <property name="org.apache.jasper.Constants. USE_INSTANCE_MANAGER_FOR_TAGS">
      <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>
    </property>

  </properties>

</section>


<section name="Security">

  <properties>

    <property name="org.apache.catalina.connector. RECYCLE_FACADES">
      <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>
    </property>

    <property
    name="org.apache.catalina.connector. CoyoteAdapter.ALLOW_BACKSLASH">
      <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>
    </property>

    <property
    name="org.apache.tomcat.util.buf. UDecoder.ALLOW_ENCODED_SLASH">
      <p>If this is <code>true</code> '%2F' and '%5C' will be permitted as path
      delimiters.</p>
      <p>If not specified, the default value of <code>false</code> will be used.</p>
    </property>

  </properties>

</section>


<section name="Specifications">

  <properties>

    <property name="org.apache.catalina. STRICT_SERVLET_COMPLIANCE">
      <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.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>

      <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>
    </property>

    <property name="org.apache.catalina.connector. Response.ENFORCE_ENCODING_IN_GET_WRITER">
      <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>
    </property>

    <property name="org.apache.catalina.core.ApplicationContext .GET_RESOURCE_REQUIRE_SLASH">
      <p>If this is <code>true</code> then the path passed to
      <code>ServletContext.getResource()</code> or
      <code>ServletContext.getResourceAsStream()</code> must start with
      &quot;/&quot;. If <code>false</code>, code like
      <code>getResource("myfolder/myresource.txt")</code> will work as Tomcat
      will prepend &quot;/&quot; 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>
    </property>

    <property name="org.apache.catalina.core. ApplicationDispatcher.WRAP_SAME_OBJECT">
      <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>
    </property>

    <property name="org.apache.tomcat.websocket. STRICT_SPEC_COMPLIANCE">
      <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>

    </property>

    <property
    name="org.apache.tomcat.util.http. ServerCookie.ALLOW_EQUALS_IN_VALUE">
      <p>Deprecated. This will be removed in Tomcat 9. Specify the
      <code>allowEqualsInValue</code> attribute on the
      <a href="cookie-processor.html">org.apache.tomcat.util.http.LegacyCookieProcessor</a>
      instead.</p>
      <p>This sets the default value for <code>allowEqualsInValue</code>
      attribute on the
      <code>org.apache.tomcat.util.http.LegacyCookieProcessor</code>.
      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 specification compliant value of
      <code>false</code> will be used.</p>
    </property>

    <property
    name="org.apache.tomcat.util.http. ServerCookie.ALLOW_HTTP_SEPARATORS_IN_V0">
      <p>Deprecated. This will be removed in Tomcat 9. Specify the
      <code>allowHttpSepsInV0</code> attribute on the
      <a href="cookie-processor.html">org.apache.tomcat.util.http.LegacyCookieProcessor</a>
      instead.</p>
      <p>This sets the default value for <code>allowHttpSepsInV0</code>
      attribute on the
      <code>org.apache.tomcat.util.http.LegacyCookieProcessor</code>.
      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>
    </property>

    <property name="org.apache.tomcat.util.http. ServerCookie.ALLOW_NAME_ONLY">
      <p>Deprecated. This will be removed in Tomcat 9. Specify the
      <code>allowNameOnly</code> attribute on the
      <a href="cookie-processor.html">org.apache.tomcat.util.http.LegacyCookieProcessor</a>
      instead.</p>
      <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>
    </property>

    <property
    name="org.apache.tomcat.util.http. ServerCookie.ALWAYS_ADD_EXPIRES">
      <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>
    </property>

    <property
    name="org.apache.tomcat.util.http. ServerCookie.FWD_SLASH_IS_SEPARATOR">
      <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>
    </property>

    <property name="org.apache.tomcat.util.http. ServerCookie.PRESERVE_COOKIE_HEADER">
      <p>Deprecated. This attribute is no longer used. From Tomcat 8.0.31,
      Tomcat will always preserve the cookie header returned by
      <code>HttpServletRequest.getHeader()</code>. This will be removed in
      Tomcat 9.</p>
    </property>

    <property name="org.apache.tomcat.util.http. ServerCookie.STRICT_NAMING">
      <p> If this is <code>true</code> 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>
    </property>

  </properties>

</section>


<section name="Sessions">

  <properties>

    <property name="org.apache.catalina.authenticator.
                    Constants.SSO_SESSION_COOKIE_NAME">
      <p>An alternative name for the single sign on session cookie. Defaults to
      <code>JSESSIONIDSSO</code>.</p>
    </property>

    <property name="org.apache.catalina.core. StandardHostValve.ACCESS_SESSION">
      <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>
    </property>

    <property
    name="org.apache.catalina.session. StandardSession.ACTIVITY_CHECK">
      <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>
    </property>

    <property
    name="org.apache.catalina.session. StandardSession.LAST_ACCESS_AT_START">
      <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>
    </property>

  </properties>

</section>

<section name="Logging">

  <properties>

    <property name="org.apache.juli.formatter">
      <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>
    </property>

    <property name="org.apache.juli. AsyncOverflowDropType">
      <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>
    </property>

    <property name="org.apache.juli. AsyncMaxRecordCount">
      <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>
    </property>

    <property name="org.apache.juli. AsyncLoggerPollInterval">
      <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>
    </property>

    <property name="org.apache.juli.logging. UserDataHelper.CONFIG">
      <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>
         </ul>
         <p>Other errors triggered by invalid input data may be added to this
         system in later versions.</p>
    </property>

    <property name="org.apache.juli.logging. UserDataHelper.SUPPRESSION_TIME">
      <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>
    </property>
  </properties>

</section>

<section name="JAR Scanning">

  <properties>
    <property name="tomcat.util.scan. StandardJarScanFilter.jarsToSkip">
      <p>A list of comma-separated file name patters 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 empty, however the system property is set in
         a default Tomcat installation via the
         <code>$CATALINA_BASE/conf/catalina.properties</code> file.</p>
    </property>

    <property name="tomcat.util.scan. StandardJarScanFilter.jarsToScan">
      <p>A list of comma-separated file name patters 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 empty, however the system property is set in
         a default Tomcat installation via the
         <code>$CATALINA_BASE/conf/catalina.properties</code> file.</p>
    </property>

  </properties>

</section>

<section name="Websockets">

  <properties>

    <property name="org.apache.tomcat .websocket.ALLOW_UNSUPPORTED_EXTENSIONS">
      <p>If <code>true</code>, allow unknown extensions to be declared by
      the user.</p>
      <p>The default value is <code>false</code>.</p>
    </property>

    <property name="org.apache.tomcat. websocket.DEFAULT_ORIGIN_HEADER_VALUE">
      <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>
    </property>

    <property name="org.apache.tomcat. websocket.DEFAULT_PROCESS_PERIOD">
      <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>
    </property>

    <property name="org.apache.tomcat. websocket.DISABLE_BUILTIN_EXTENSIONS">
      <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>
    </property>

    <property name="org.apache.tomcat. websocket.STREAMS_DROP_EMPTY_MESSAGES">
      <p>If <code>true</code>, streams provided to the user (writer and output
      stream) will not send an empty message when flushing and there is no
      data to flush, or when it is closed without having been used (for
      example if an error occurs).</p>
      <p>The default value is <code>false</code>.</p>
    </property>

  </properties>

</section>

<section name="Other">

  <properties>

    <property
    name="org.apache.coyote. USE_CUSTOM_STATUS_MSG_IN_HEADER"><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>
    </property>

    <property name="catalina.useNaming">
      <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>
    </property>

    <property name="javax.sql.DataSource.Factory">
      <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="http://commons.apache.org/dbcp">Apache Commons DBCP</a>.</p>
    </property>

    <property name="javax.mail.Session.Factory">
      <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>
    </property>

    <property name="jvmRoute">
      <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>
    </property>

    <property name="catalina.config">
      <p>The URL for the catalina.properties configuration file.</p>
    </property>

    <property name="tomcat.util.buf.StringCache.byte.enabled">
      <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>
    </property>

    <property name="tomcat.util.buf.StringCache.char.enabled">
      <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>
    </property>

    <property name="tomcat.util.buf.StringCache.trainThreshold">
      <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>
    </property>

    <property name="tomcat.util.buf.StringCache.cacheSize">
      <p>The size of the String cache.</p>
      <p>If not specified, the default value of <code>200</code> will be used.</p>
    </property>

    <property name="tomcat.util.buf.StringCache.maxStringSize">
      <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>
    </property>

    <property name="org.apache.tomcat.util. http.FastHttpDateFormat.CACHE_SIZE">
      <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>
    </property>

    <property name="org.apache.tomcat.util. net.NioSelectorShared">
      <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>
    </property>

    <property name="org.apache.catalina.startup. EXIT_ON_INIT_FAILURE">
      <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>
    </property>

    <property name="org.apache.catalina.startup. RealmRuleSet.MAX_NESTED_REALM_LEVELS">
      <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>
    </property>

    <property name="org.apache.catalina.startup. CredentialHandlerRuleSet.MAX_NESTED_LEVELS">
      <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>
    </property>

  </properties>

</section>


</body>
</document>
