Links Top Level Elements Executors Connectors Containers Nested Components Cluster Elements Global Settings | Apache Tomcat Configuration ReferenceSystem Properties| Introduction |
The follow sections list the system properties that may be set to modify
the default Tomcat behaviour.
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| Clustering |
| Property | Description |
|---|
org.apache.catalina. tribes.dns_lookups |
If true, 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 false will be used.
|
|
| Expression Language |
| Property | Description |
|---|
org.apache.el.parser.COERCE_TO_ZERO |
If true, when coercing expressions to numbers
"" and null will be coerced to zero as required
by the specification. If not specified, the default value of
true will be used.
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|
| Jasper |
| Property | Description |
|---|
org.apache.jasper.compiler. Generator.VAR_EXPRESSIONFACTORY |
The name of the variable to use for the expression language expression
factory. If not specified, the default value of
_el_expressionfactory will be used.
| org.apache.jasper.compiler. Generator.VAR_INSTANCEMANAGER |
The name of the variable to use for the instance manager factory. If
not specified, the default value of _jsp_instancemanager will
be used.
| org.apache.jasper.compiler. Parser.STRICT_QUOTE_ESCAPING |
If false the requirements for escaping quotes in JSP
attributes will be relaxed so that a missing required quote will not
cause an error. If not specified, the specification compliant default of
true will be used.
| org.apache.jasper.runtime. BodyContentImpl.LIMIT_BUFFER |
If true, any tag buffer that expands beyond
org.apache.jasper.Constants.DEFAULT_TAG_BUFFER_SIZE will be
destroyed and a new buffer created of the default size. If not specified,
the default value of false will be used.
| org.apache.jasper.runtime. JspFactoryImpl.USE_POOL |
If true, a ThreadLocal PageContext pool will
be used. If not specified, the default value of true will be
used.
| org.apache.jasper.runtime. JspFactoryImpl.POOL_SIZE |
The size of the ThreadLocal PageContext. If not specified,
the default value of 8 will be used.
| org.apache.jasper.Constants. JSP_SERVLET_BASE |
The base class of the Servlets generated from the JSPs. If not
specified, the default value of
org.apache.jasper.runtime.HttpJspBase will be used.
| org.apache.jasper.Constants. SERVICE_METHOD_NAME |
The name of the service method called by the base class. If not
specified, the default value of _jspService will be used.
| org.apache.jasper.Constants. SERVLET_CLASSPATH |
The name of the ServletContext attribute that provides the classpath
for the JSP. If not specified, the default value of
org.apache.catalina.jsp_classpath will be used.
| org.apache.jasper.Constants. JSP_FILE |
The name of the request attribute for <jsp-file>
element of a servlet definition. If present on a request, this overrides
the value returned by request.getServletPath() to select the
JSP page to be executed. If not specified, the default value of
org.apache.catalina.jsp_file will be used.
| org.apache.jasper.Constants. PRECOMPILE |
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 org.apache.catalina.jsp_precompile will be used.
| org.apache.jasper.Constants. JSP_PACKAGE_NAME |
The default package name for compiled jsp pages. If not specified, the
default value of org.apache.jsp will be used.
| org.apache.jasper.Constants. TAG_FILE_PACKAGE_NAME |
The default package name for tag handlers generated from tag files. If
not specified, the default value of org.apache.jsp.tag will
be used.
| org.apache.jasper.Constants. ALT_DD_ATTR |
The servlet context attribute under which the alternate deployment
descriptor for this web application is stored. If not specified, the
default value of org.apache.catalina.deploy.alt_dd will
be used.
| org.apache.jasper.Constants. TEMP_VARIABLE_NAME_PREFIX |
Prefix to use for generated temporary variable names. If not specified,
the default value of _jspx_temp will be used.
| org.apache.jasper.Constants. USE_INSTANCE_MANAGER_FOR_TAGS |
If true, the instance manager is used to obtain tag
handler instances. If not specified, false will be used.
|
|
| Security |
| Property | Description |
|---|
org.apache.catalina.connector. RECYCLE_FACADES |
If this is true or if a security manager is in use a new
facade object will be created for each request. If not specified, the
default value of false will be used.
| org.apache.catalina.connector. CoyoteAdapter.ALLOW_BACKSLASH |
If this is true the '\' character will be permitted as a
path delimiter. If not specified, the default value of false
will be used.
| org.apache.tomcat.util.buf. UDecoder.ALLOW_ENCODED_SLASH |
If this is true '%2F' and '%5C' will be permitted as path
delimiters. If not specified, the default value of false will
be used.
| org.apache.coyote. USE_CUSTOM_STATUS_MSG_IN_HEADER | If this is
true, 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 false will be used.
|
|
| Specification |
| Property | Description |
|---|
org.apache.catalina. STRICT_SERVLET_COMPLIANCE |
If this is true the following actions will occur:
- 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. (SRV.8.2 / SRV.14.2.5.1)
- a call to
Response.getWriter() if no character encoding
has been specified will result in subsequent calls to
Response.getCharacterEncoding() returning
ISO-8859-1 and the Content-Type response header
will include a charset=ISO-8859-1 component. (SRV.15.2.22.1)
- 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. (SRV.7.6)
-
cookies will be parsed strictly, by default v0 cookies will not work with any invalid characters.
If set to false, any v0 cookie with invalid character will be switched to a v1 cookie and
the value will be quoted.
-
ServletContext.getResource/getResourceAsStream must start with "/"
if set to false, code like getResource("myfolder/myresource.txt") will work
| org.apache.catalina.session. StandardSession.ACTIVITY_CHECK |
If this is true or if
org.apache.catalina.STRICT_SERVLET_COMPLIANCE is
true 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. If not specified, the
default value of false will be used.
| org.apache.tomcat.util.http. ServerCookie.ALLOW_EQUALS_IN_VALUE |
If this is true Tomcat will allow =
characters when parsing unquoted cookie values. If false,
cookie values containing = will be terminated when the
= is encountered and the remainder of the cookie value will
be dropped. If not specified, the default specification compliant value of
false will be used.
| org.apache.tomcat.util.http. ServerCookie.ALWAYS_ADD_EXPIRES |
If this is true 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 not specified, the
default value of true will be used.
|
|
| Sessions |
| Property | Description |
|---|
org.apache.catalina.SESSION_COOKIE_NAME |
An alternative name for the session cookie. Defaults to
JSESSIONID. Note that the Servlet specification requires
this to be JSESSIONID. You should not rely on being able to
change this.
| org.apache.catalina.SESSION_PARAMETER_NAME |
An alternative name for the session path parameter. Defaults to
jsessionid. Note that the Servlet specification requires
this to be jsessionid. You should not rely on being able to
change this.
| org.apache.catalina.SSO_SESSION_COOKIE_NAME |
An alternative name for the single sign on session cookie. Defaults to
JSESSIONIDSSO.
|
|
| Other |
Limits the total length of extension data when using chunked encoding.
If the value is -1, no limit will be imposed.
If not specified, the default value of 8192 will be
used.
Limits the total length of trailing headers in the last chunk of
a chunked HTTP request.
If the value is -1, no limit will be imposed.
If not specified, the default value of 8192 will be used.
| Property | Description |
|---|
catalina.useNaming |
If this is false it will override the
useNaming attribute for all
Context elements.
| jvmRoute |
Provides a default value for the jvmRoute attribute of the
Engine element. It does not override the a value
configured on the Engine element.
| org.apache.catalina.loader. WebappClassLoader.ENABLE_CLEAR_REFERENCES |
If true, Tomcat attempts to null out any static or final
fields from loaded classes when a web application is stopped as a work
around for apparent garbage collection bugs and application coding errors.
There have been some issues reported with log4j when this option is
true.
Applications without memory leaks using recent JVMs should operate
correctly with this option set to false.
If not specified, the default value of true will be used.
| catalina.config |
The URL for the catalina.properties configuration file.
| tomcat.util.buf.StringCache.byte.enabled |
If true, the String cache is enabled for
ByteChunk. If not specified, the default value of
false will be used.
| tomcat.util.buf.StringCache.char.enabled |
If true, the String cache is enabled for
CharChunk. If not specified, the default value of
false will be used.
| tomcat.util.buf.StringCache.trainThreshold |
The number of times toString() must be called before the
cache is activated. If not specified, the default value of
20000 will be used.
| tomcat.util.buf.StringCache.cacheSize |
The size of the String cache. If not specified, the default value of
200 will be used.
| tomcat.util.buf.StringCache.maxStringSize |
The maximum length of String that will be cached. If not specified, the
default value of 128 will be used.
| org.apache.tomcat.util. http.FastHttpDateFormat.CACHE_SIZE |
The size of the cache to use parsed and formatted date value. If not
specified, the default value of 1000 will be used.
| org.apache.tomcat.util. net.NioSelectorShared |
If true, use a shared selector for servlet write/read. If
not specified, the default value of true will be used.
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