Sun Java System Web Server 6.1 SP12 Programmer's Guide to Web Applications

Elements in the sun-web.xml File

This section describes the XML elements in the sun-web.xml file. Elements are grouped as follows:

This section also includes an alphabetical list of the elements for quick reference. See Alphabetical List of sun-web.xml Elements.

Note –

Subelements must be defined in the order in which they are listed under each Subelements heading, unless otherwise noted.

Note –

Each sun-web.xml file must begin with the following DOCTYPE header:

<!DOCTYPE sun-web-app PUBLIC '-//Sun Microsystems, Inc.//DTD Sun Java System Web Server 6.1 Servlet 2.3//EN''http://www.sun.com/software/sunone/webserver/dtds/sun-web-app_2_3-1.dtd'>

For an alphabetical list of elements in sun-web.xml, see Alphabetical List of sun-web.xml Elements

General Elements

General elements are as follows:

sun-web-app

Defines Sun Java System Web Server-specific configuration for a web application. This is the root element; there can only be one sun-web-app element in a sun-web.xml file.

Subelements

The following table describes subelements for the sun-web-app element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–5 sun-web-app Subelements


Element	Required	Description
sun-web-appsun-web-app	zero or more	Maps roles to users or groups in the currently active realm.
servletservlet	zero or more	Specifies a principal name for a servlet, which is used for the run-as role defined in `web.xml`.
session-config	zero or one	Specifies session manager, session cookie, and other session-related information.
resource-env-ref	zero or more	Maps the absolute JNDI name to the `resource-env-ref` in the corresponding J2SE XML file.
resource-ref	zero or more	Maps the absolute JNDI name to the `resource-ref` in the corresponding J2SE XML file.
cache	zero or one	Configures caching for web application components.
class-loader	zero or one	Specifies classloader configuration information.
jsp-config	zero or one	Specifies JSP configuration information.
locale-charset-info	zero or one	Specifies internationalization settings.
propertyproperty	zero or more	Specifies a property, which contains a name and a value.

Attributes

none

Properties

The following table describes properties for the sun-web-app element. The left column lists the property name, the middle column indicates the default value, and the right column describes what the property does.

Table 6–6 sun-web-app Properties


Property Name	Default Value	Description
`crossContextAllowed`	`true`	If `true`, allows this web application to access the contexts of other web applications using the `ServletContext.getContext()` method.
`encodeCookies`	`true`	If `true`, Sun Java System Web Server URL encodes cookies before sending them to the client. If you do not want cookies to be encoded, add the following to `sun-web.xml`: `<property name="encodeCookies" value="false">` For the above example, enter the line directly under the `<sun-web-app>` tag; do not embed this in any other tag.
`tempdir`	instance_dir/`ClassCache`/vs_id/`uri`	Specifies a temporary directory for use by this web application. This value is used to construct the value of the `javax.servlet.context.tempdir` context attribute. Compiled JSPs are also placed in this directory.
`singleThreadedServletPoolSize`	`5`	Specifies the maximum number of servlet instances allocated for each `SingleThreadModel` servlet in the web application.
`reuseSessionID`	`false`	If `true`, this property causes the web application to reuse the `JSESSIONID` value (if present) in the request header as the session ID when creating sessions. The default behavior of web applications is to not reuse session IDs and instead generate cryptographically random session IDs for new sessions.
`relativeRedirectAllowed`	`false`	If `true`, allows the web application to send a relative URL to the client using the `HttpServletResponse.sendRedirect()` API (that is, it suppresses the container from translating a relative URL to a fully qualified URL).

property

Specifies a property, which contains a name and a value. A property adds configuration information to its parent element that is one or both of the following:

Optional with respect to Sun Java System Web Server.
Needed by a system or object that Sun Java System Web Server does not have knowledge of, such as an LDAP server or a Java class.

For example, a manager-properties element can include property subelements:

<manager-properties>
        <property name="reapIntervalSeconds" value="20" >
     </manager-properties>

Which properties a manager-properties element uses depends on the value of the parent session-manager element's persistence-type attribute. For details, see the description of the session-manager element.

Subelements

The following table describes subelements for the property element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–7 property Subelements


Element	Required	Description
description	zero or one	Contains a text description of this element.

Attributes

The following table describes attributes for the property element. The left column lists the attribute name, the middle column indicates the default value, and the right column describes what the attribute does.

Table 6–8 property Attributes


Attribute	Default	Description
`name`	none	Specifies the name of the property or variable.
`value`	none	Specifies the value of the property or variable.

description

Contains a text description of the parent element.

Subelements

none

Attributes

none

Security Elements

Security elements are as follows:

security-role-mapping

Maps roles to users or groups in the currently active realm.

Subelements

The following table describes subelements for the security-role-mapping element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–9 security-role-mapping Subelements


Element	Required	Description
role-name	only one	Contains the role name.
principal-name	requires at least one `principal-name` or `group-name`	Contains a principal (user) name in the current realm.
group-name	requires at least one `principal-name` or `group-name`	Contains a group name in the current realm.

Attributes

none

servlet

Specifies a principal name for a servlet, which is used for the run-as role defined in web-xml.

Subelements

The following table describes subelements for the servlet element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–10 servlet Subelements


Element	Required	Description
servlet-name	only one	Contains the name of a servlet, which is matched to a `servlet-name` in `web.xml`.
principal-name	only one	Contains a principal (user) name in the current realm.

Attributes

none

servlet-name

Contains data that specifies the name of a servlet, which is matched to a servlet-name in the web.xml file. This name must be present in the web.xml file.

Subelements

none

Attributes

none

role-name

Contains data that specifies the role-name in the security-role element of the web.xml file.

Subelements

none

Attributes

none

principal-name

Contains data that specifies a principal (user) name in the current realm.

Subelements

none

Attributes

none

group-name

Contains data that specifies a group name in the current realm.

Subelements

none

Attributes

none

Session Elements

Session elements are as follows:

Note –

The session manager interface is unstable. An unstable interface may be experimental or transitional, and thus may change incompatibly, be removed, or be replaced by a more stable interface in the next release.

session-config

Specifies session configuration information.

Subelements

The following table describes subelements for the session-config element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–11 session-config Subelements


Element	Required	Description
session-manager	zero or one	Specifies session manager configuration information.
session-properties	zero or one	Specifies session properties.
cookie-properties	zero or one	Specifies session cookie properties.

Attributes

none

session-manager

Specifies session manager information.

Note –

In Sun Java System Web Server 6.1, you cannot define a session manager either for a single sign-on session or for a virtual server. You must define session managers at the level of web applications.

Subelements

The following table describes subelements for the session-manager element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–12 session-manager Subelements


Element	Required	Description
manager-properties	zero or one	Specifies session manager properties.
store-properties	zero or one	Specifies session persistence (storage) properties.

Attributes

The following table describes attributes for the session-manager element. The left column lists the attribute name, the middle column indicates the default value, and the right column describes what the attribute does.

Table 6–13 session-manager Attributes


Attribute	Default Value	Description
`persistence-type`	`memory`	(optional) Specifies the session persistence mechanism. Allowed values are `memory`, `file`, `s1ws60`, and `mmap`. Setting the value of persistence type to `memory` is equivalent to using Sun Java System Web Server’s IWSSessionManager without any store. Setting the value of persistence type to `file` is equivalent to using Sun Java System Web Server’s IWSSessionManager with `FileStore`.

manager-properties

Specifies session manager properties.

Subelements

The following table describes subelements for the manager-properties element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–14 manager-properties Subelements


Element	Required	Description
property	zero or more	Specifies a property, which contains a name and a value.

Attributes

none

Properties

The following table describes properties for the manager-properties element. The left column lists the property name, the middle column indicates the default value, and the right column describes what the property does.

Table 6–15 manager-properties Properties


Property Name	Default Value	Description
`reapIntervalSeconds`	`60`	Specifies the number of seconds between checks for expired sessions. Setting this value lower than the frequency at which session data changes is recommended. For example, this value should be as low as possible (1 second) for a hit counter servlet on a frequently accessed web site, or you could lose the last few hits each time you restart the server.
`maxSessions`	-1	Specifies the maximum number of active sessions, or `-1` (the default) for no limit.
`sessionFilename`	none; state is not preserved across restarts	Specifies the absolute or relative path name of the file in which the session state is preserved between application restarts, if preserving the state is possible. A relative path name is relative to the temporary directory for this web application. Applicable only if the `persistence-type` attribute of the session-manager element is `memory`.

store-properties

Specifies session persistence (storage) properties.

Subelements

The following table describes subelements for the store-properties element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–16 store-properties Subelements


Element	Required	Description
property	zero or more	Specifies a property, which contains a name and a value.

Attributes

none

Properties

The following table describes properties for the store-properties element. The left column lists the property name, the middle column indicates the default value, and the right column describes what the property does.

Table 6–17 store-properties Properties


Property Name	Default Value	Description
`reapIntervalSeconds`	`60`	Specifies the number of seconds between checks for expired sessions for those sessions that are currently swapped out. Setting this value lower than the frequency at which session data changes is recommended. For example, this value should be as low as possible (1 second) for a hit counter servlet on a frequently accessed web site, or you could lose the last few hits each time you restart the server.
`directory`	directory specified by `javax.servlet.context.tempdir` context attribute	Specifies the absolute or relative path name of the directory into which individual session files are written. A relative path is relative to the temporary work directory for this web application.

session-properties

Specifies session properties.

Subelements

The following table describes subelements for the session-properties element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–18 session-properties Subelements


Element	Required	Description
property	zero or more	Specifies a property, which contains a name and a value.

Attributes

none

Properties

The following table describes properties for the session-properties element. The left column lists the property name, the middle column indicates the default value, and the right column describes what the property does.

Table 6–19 session-properties Properties


Property Name	Default Value	Description
`timeoutSeconds`	`600`	Specifies the default maximum inactive interval (in seconds) for all sessions created in this web application. If set to `0` or less, sessions in this web application do not expire. If a session-timeout element is specified in the `web.xml` file, the `session-timeout` value overrides any `timeoutSeconds` value. If neither `session-timeout` nor `timeoutSeconds` is specified, the `timeoutSeconds` default is used. Note that the `session-timeout` element in `web.xml` is specified in minutes, not seconds.
`enableCookies`	`true`	Uses cookies for session tracking if set to `true`.
`enableURLRewriting`	`true`	Enables URL rewriting. This provides session tracking via URL rewriting when the browser does not accept cookies. You must also use an `encodeURL` or `encodeRedirectURL` call in the servlet or JSP.

cookie-properties

Specifies session cookie properties.

Subelements

The following table describes subelements for the cookie-properties element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–20 cookie-properties Subelements


Element	Required	Description
property	zero or more	Specifies a property, which contains a name and a value.

Attributes

none

Properties

The following table describes properties for the cookie-properties element. The left column lists the property name, the middle column indicates the default value, and the right column describes what the property does.

Table 6–21 cookie-properties Properties


Property Name	Default Value	Description
`cookiePath`	context path at which the web application is installed.	Specifies the path name that is set when the session tracking cookie is created. The browser sends the cookie if the path name for the request contains this path name. If set to `/` (slash), the browser sends cookies to all URLs served by the Sun Java System Web Server. You can set the path to a narrower mapping to limit the request URLs to which the browser sends cookies.
`cookieMaxAgeSeconds`	`-1`	Specifies the expiration time (in seconds) after which the browser expires the cookie. The default value of `-1` indicates that the cookie never expires.
`cookieDomain`	(unset)	Specifies the domain for which the cookie is valid.
`cookieComment`	Sun Java System Web Server session tracking cookie	Specifies the comment that identifies the session tracking cookie in the cookie file. Applications can provide a specific comment for the cookie.

Reference Elements

Reference elements are as follows:

resource-env-ref

Maps the res-ref-name in the corresponding J2SE web.xml file resource-env-refentry to the absolute jndi-name of a resource.

Subelements

The following table describes subelements for the resource-env-ref element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–22 resource-env-ref Subelements


Element	Required	Description
resource-env-ref-name	only one	Specifies the `res-ref-name` in the corresponding J2SE `web.xml` file `resource-env-ref` entry.
jndi-name	only one	Specifies the absolute `jndi-name` of a resource.

Attributes

none

resource-env-ref-name

Contains data that specifies the res-ref-name in the corresponding J2SE web.xml file resource-env-ref entry.

Subelements

none

Attributes

none

resource-ref

Maps the res-ref-namee in the corresponding J2SE web.xml file resource-ref entry to the absolute jndi-name of a resource.

Subelements

The following table describes subelements for the resource-ref element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–23 resource-ref Subelements


Element	Required	Description
res-ref-name	only one	Specifies the `res-ref-name` in the corresponding J2SE `web.xml` file `resource-ref` entry.
jndi-name	only one	Specifies the absolute `jndi-name` of a resource.
default-resource-principal	zero or one	Specifies the default principal (user) for the resource.

Attributes

none

res-ref-name

Contains data that specifies the res-ref-name in the corresponding J2SE web.xml file resource-ref entry.

Subelements

none

Attributes

none

default-resource-principal

Specifies the default principal (user) for the resource.

If this element is used in conjunction with a JMS Connection Factory resource, the name and password subelements must be valid entries in Sun™ Java System Message Queue's broker user repository.

Subelements

The following table describes subelements for the default-resource-principal element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–24 default-resource-principal Subelements


Element	Required	Description
name	only one	Contains the name of the principal.
password	only one	Contains the password for the principal.

Attributes

none

name

Contains data that specifies the name of the principal.

Subelements

none

Attributes

none

password

Contains data that specifies the password for the principal.

Subelements

none

Attributes

none

jndi-name

Contains data that specifies the absolute jndi-name of a URL resource or a resource in the server.xml file.

Note –

To avoid collisions with names of other enterprise resources in JNDI, and to avoid portability problems, all names in a Sun Java System Web Server application should begin with the string java:comp/env.

Subelements

none

Attributes

none

Caching Elements

For details about response caching as it pertains to servlets, see Caching Servlet Results JSP Cache Tags

Caching elements are as follows:

cache

Configures caching for web application components.

Subelements

The following table describes subelements for the cache element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–25 cache Subelements


Element	Required	Description
cache-helper	zero or more	Specifies a custom class that implements the `CacheHelper` interface.
default-helper	zero or one	Allows you to change the properties of the default, built-in `cache-helper` class.
property	zero or more	Specifies a cache property, which contains a name and a value.
cache-mapping	zero or more	Maps a URL pattern or a servlet name to its cacheability constraints.

Attributes

The following table describes attributes for the cache element. The left column lists the attribute name, the middle column indicates the default value, and the right column describes what the attribute does.

Table 6–26 cache Attributes


Attribute	Default Value	Description
`max-entries`	`4096`	(optional) Specifies the maximum number of entries the cache can contain. Must be a positive integer.
`timeout-in-seconds`	30	(optional) Specifies the maximum amount of time in seconds that an entry can remain in the cache after it is created or refreshed. Can be overridden by a timeout element.
`enabled`	false	(optional) Determines whether servlet and JSP caching is enabled. Legal values are `on`, `off`, `yes`, `no`, `1`, `0`, `true`, `false`.

Properties

The following table describes properties for the cache element. The left column lists the property name, the middle column indicates the default value, and the right column describes what the property does.

Table 6–27 cache Properties


Property Name	Default Value	Description
`cacheClassName`	`com.sun.appserv.web.cache.LruCache`	Specifies the fully qualified name of the class that implements the cache functionality. See The Table 6–28
`MultiLRUSegmentSize`	`4096`	Specifies the number of entries in a segment of the cache table that should have its own LRU (least recently used) list. Applicable only if `cacheClassName` is set to `com.sun.appserv.web.cache.MultiLruCache`.
`MaxSize`	`unlimited; Long.MAX_VALUE`	Specifies an upper bound on the cache memory size in bytes (KB or MB units). Example values are 32 KB or 2 MB. Applicable only if `cacheClassName` is set to `com.sun.appserv.web.cache.BoundedMultiLruCache`.

Cache Class Names

The following table lists possible values of the cacheClassName property. The left column lists the value, and the right column describes the kind of cache the value specifies.

Table 6–28 cacheClassName Values


Value	Description
`com.sun.appserv.web.cache.LruCache`	A bounded cache with an LRU cache replacement policy.
`com.sun.appserv.web.cache.BaseCache`	An unbounded cache suitable if the maximum number of entries is known.
`com.sun.appserv.web.cache.MultiLruCache`	A cache suitable for a large number of entries (>4096). Uses the `MultiLRUSegmentSize` property.
`com.sun.appserv.web.cache.BoundedMultiLruCache`	A cache suitable for limiting the cache size by memory rather than number of entries. Uses the `MaxSize` property.

cache-helper

Specifies a class that implements the CacheHelper interface. For details, see CacheHelper Interface

Subelements

The following table describes subelements for the cache-helper element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–29 cache-helper Subelements


Element	Required	Description
property	zero or more	Specifies a property, which contains a name and a value.

Attributes

The following table describes attributes for the cache-helper element. The left column lists the attribute name, the middle column indicates the default value, and the right column describes what the attribute does.

Table 6–30 cache-helper Attributes


Attribute	Default Value	Description
`name`	default	Specifies a unique name for the helper class, which is referenced in the cache-mapping element.
`class-name`	none	Specifies the fully qualified class name of the cache helper, which must implement the `com.sun.appserv.web.CacheHelper` interface.

default-helper

Allows you to change the properties of the built-in default cache-helper class.

Subelements

The following table describes subelements for the default-helper element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–31 default-helper Subelements


Element	Required	Description
property	zero or more	Specifies a property, which contains a name and a value.

Attributes

none

Properties

The following table describes properties for the default-helper element. The left column lists the property name, the middle column indicates the default value, and the right column describes what the property does.

Table 6–32 default-helper Properties


Property Name	Default Value	Description
`cacheKeyGeneratorAttrName`	uses the built-in default `cache-helper` key generation, which concatenates the servlet path with `key-field` values, if any.	The caching engine searches in the `ServletContext` for an attribute with a name equal to the value specified for this property to determine whether a customized `CacheKeyGenerator` implementation is used. An application may provide a customized key generator rather than using the default helper. For more information, see CacheKeyGenerator Interface

cache-mapping

Maps a URL pattern or a servlet name to its cacheability constraints.

Subelements

The following table describes subelements for the cache-mapping element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–33 cache-mapping Subelements


Element	Required	Description
servlet-name	requires one `servlet-name` or `url-pattern`	Contains the name of a servlet.
url-pattern	requires one `servlet-name` or `url-pattern`	Contains a servlet URL pattern for which caching is enabled.
cache-helper-ref	required if `timeout`, `refresh-field,http-method`, `key-field`, and `constraint-field` are not used	Contains the name of the `cache-helper` used by the parent `cache-mapping` element.
timeout	zero or one if `cache-helper-ref` is not used	Contains the `cache-mapping` specific maximum amount of time in seconds that an entry can remain in the cache after it is created or refreshed
refresh-field	zero or one if `cache-helper-ref` is not used	Specifies a field that gives the application component, programmatic way to refresh a cached entry.
http-method	zero or more if `cache-helper-ref` is not used	Contains an HTTP method that is eligible for caching.
key-field	zero or more if `cache-helper-ref` is not used	Specifies a component of the key used to look up and extract cache entries.
constraint-field	zero or more if `cache-helper-ref` is not used	Specifies a cacheability constraint for the given `url-pattern` or `servlet-name`.

Attributes

none

url-pattern

Contains data that specifies a servlet URL pattern for which caching is enabled. See the Java Servlet 2.3 specification, section SRV 11.2 for applicable patterns.

Subelements

none

Attributes

none

cache-helper-ref

Contains data that specifies the name of the cache-helper used by the parent cache-mapping element.

Subelements

none

Attributes

none

timeout

Contains data that specifies the cache-mapping specific maximum amount of time in seconds that an entry can remain in the cache after it is created or refreshed. If not specified, the default is the value of the timeout attribute of the cache element.

Subelements

none

Attributes

The following table describes attributes for the timeout element. The left column lists the attribute name, the middle column indicates the default value, and the right column describes what the attribute does.

Table 6–34 timeout Attributes


Attribute	Default Value	Description
`name`	none	Specifies the timeout input parameter, whose value is interpreted in seconds. The field's type must be `java.lang.Long` or `java.lang.Integer`.
`scope`	`context.attribute`	(optional) Specifies the scope in which the input parameter can be present. Allowed values are `context.attribute`, `request.header`, `request.parameter`, `request.cookie`, `session.id`, and `session.attribute`.

refresh-field

Specifies a field that gives the application component a programmatic way to refresh a cached entry.

Subelements

none

Attributes

The following table describes attributes for the refresh-field element. The left column lists the attribute name, the middle column indicates the default value, and the right column describes what the attribute does.

Table 6–35 refresh-field Attributes


Attribute	Default Value	Description
`name`	none	Specifies the input parameter name. If the parameter is present in the specified scope and it’s value is `true`, the cache will be refreshed.
`scope`	`request.parameter`	(optional) Specifies the scope in which the input parameter can be present. Allowed values are `context.attribute`, `request.header`, `request.parameter`, `request.cookie`, `session.id`, and `session.attribute`.

http-method

Contains data that specifies an HTTP method that is eligible for caching. The default is GET.

Subelements

none

Attributes

none

key-field

Specifies a component of the key used to look up and extract cache entries. The web container searches for the named parameter, or field, in the specified scope.

If this element is not present, the web container uses the Servlet Path (the path section that corresponds to the servlet mapping that activated the current request). See the Servlet 2.3 specification, section SRV 4.4, for details on the Servlet Path.

Subelements

none

Attributes

The following table describes attributes for the key-field element. The left column lists the attribute name, the middle column indicates the default value, and the right column describes what the attribute does.

Table 6–36 key-field Attributes


Attribute	Default Value	Description
`name`	none	Specifies the input parameter name.
`scope`	`request.parameter`	(optional) Specifies the scope in which the input parameter can be present. Allowed values are `context.attribute`, `request.header`, `request.parameter`, `request.cookie`, `session.id`, and `session.attribute`.

constraint-field

Specifies a cacheability constraint for the given url-pattern or servlet-name.

All constraint-field constraints must pass for a response to be cached. If there are value constraints, at least one of them must pass.

Subelements

The following table describes subelements for the constraint-field element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–37 constraint-field Subelements


Element	Required	Description
value	zero or more	Contains a value to be matched to the input parameter value.

Attributes

The following table describes attributes for the constraint-field element. The left column lists the attribute name, the middle column indicates the default value, and the right column describes what the attribute does.

Table 6–38 constraint-field Attributes


Attribute	Default Value	Description
`name`	none	Specifies the input parameter name.
`scope`	`request.parameter`	(optional) Specifies the scope in which the input parameter can be present. Allowed values are `context.attribute`, `request.header`, `request.parameter`, `request.cookie`, `session.id`, and `session.attribute`.
`cache-on-match`	true	(optional) If `true`, caches the response if matching succeeds. Overrides the same attribute in a `value` subelement.
`cache-on-match-failure`	false	(optional) If `true`, caches the response if matching fails. Overrides the same attribute in a `value` subelement.

value

Contains data that specifies a value to be matched to the input parameter value. The matching is case sensitive. For example:

<value match-expr="in-range">1-60</value>

Subelements

none

Attributes

The following table describes attributes for the value element. The left column lists the attribute name, the middle column indicates the default value, and the right column describes what the attribute does.

Table 6–39 value Attributes


Attribute	Default Value	Description
`match-expr`	`equals`	(optional) Specifies the type of comparison performed with the value. Allowed values are `equals`, `not-equals`, `greater`, `lesser`, and `in-range`. If `match-expr` is greater or lesser, the value must be a number. If `match-expr` is in-range, the value must be of the form n1-n2, where n1 and n2 are numbers.
`cache-on-match`	`true`	(optional) If `true`, caches the response if matching succeeds.
`cache-on-match-failure`	false	(optional) If `true`, caches the response if matching fails.

Classloader Elements

Classloader elements are as follows:

class-loader

class-loader

Configures the classloader for the web application.

Subelements

none

Attributes

The following table describes attributes for the class-loader element. The left column lists the attribute name, the middle column indicates the default value, and the right column describes what the attribute does.

Table 6–40 class-loader Attributes


Attribute	Default Value	Description
`extra-class-path`	null	(optional) Specifies additional classpath settings for this web application.
`delegate`	`false`	(optional) If `true`, the web application follows the standard classloader delegation model and delegates to its parent classloader first before looking in the local classloader. If `false`, the web application follows the delegation model specified in the Servlet specification and searches in its classloader before looking in the parent classloader. For a web component of a web service, you must set this value to `true`. Legal values are `on`, `off`, `yes`, `no`, `1`, `0`, `true`, `false`.
`dynamic-reload-interval`	value of the `dynamicreloadinterval` attribute of the `<JAVA>` element in `server.xml`	(optional) Allows an application to override the `dynamicreloadinterval` setting in `server.xml`. Specifies the frequency (in seconds) at which a web application is checked for modifications, and then reloaded if modifications have been made. Setting this value to less than or equal to 0 disables dynamic reloading of the application. If not specified, the value from `server.xml` is used. For more information about `server.xml`, see the Sun Java System Web Server 6.1 SP12 Administrator’s Configuration File Reference.

JSP Elements

JSP elements are as follows:

jsp-config

jsp-config

Specifies JSP configuration information.

Subelements

The following table describes subelements for the jsp-config element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–41 jsp-config Subelements


Element	Required	Description
name	zero or more	Specifies a property.

Attributes

none

Properties

The following table describes properties for the jsp-config element. The left column lists the property name, the middle column indicates the default value, and the right column describes what the property does.

Table 6–42 jsp-config Properties


Property Name	Default Value	Description
`ieClassId`	`clsid:8AD9C840-044E-11D1-B3E9-00805F499D93`	The Java plugin COM class ID for Internet Explorer. Used by the <jsp:plugin> tags.
`javaCompilerPlugin`	internal JDK compiler (`javac`)	The fully qualified class name of the Java compiler plugin to be used. Not needed for the default compiler. For example, to use the `jikes` compiler for JSP pages, set the `javaCompilerPlugin` property to `org.apache.jasper.compiler.JikesJavaCompiler`, then set the `javaCompilerPath` property to point to the `jikes` executable. To use `sun.tools.javac.Main` to compile JSP-generated servlets, set the `javaCompilerPlugin` property to `org.apache.jasper.compiler.SunJavaCompiler` (see also the `-deprecatedjavac` switch of jspc, described in Compiling JSPs: The Command-Line Compiler
`javaCompilerPath`	none	Specifies the path to the executable of an out-of-process Java compiler such as `jikes`. Ignored for the default compiler. It is required only if the `javaCompilerPlugin` property is specified.
`javaEncoding`	`UTF8`	Specifies the encoding for the generated Java servlet. This encoding is passed to the Java compiler used to compile the servlet as well. By default, the web container tries to use UTF8. If that fails, it uses the `javaEncoding` value. For encodings, see: `http://java.sun.com/j2se/1.4.2/docs/guide/intl/encoding.doc.html`
`classdebuginfo`	`false`	Specifies whether the generated Java servlets should be compiled with the debug option set (`-g` for `javac`).
`keepgenerated`	`true`	If set to `true`, keeps the generated Java files. If `false`, deletes the Java files.
`largefile`	`false`	If set to `true`, static HTML is stored in a separate data file when a JSP is compiled. This is useful when a JSP is very large, because it minimizes the size of the generated servlet.
`mappedfile`	`false`	If set to `true`, generates separate write calls for each HTML line and comments that describe the location of each line in the JSP file. By default, all adjacent write calls are combined and no location comments are generated.
`scratchdir`	default work directory for the web application	The working directory created for storing all of the generated code.
`reload-interval`	`0`	Specifies the frequency (in seconds) at which JSP files are checked for modifications. Setting this value to 0 checks JSPs for modifications on every request. Setting this value to -1 disables checks for JSP modifications and JSP recompilation.
`initial-capacity`	`32`	Specifies the initial size of the hash table of compiled JSP classes.

The following example illustrates the use of the initial-capacity property described in the table above. The example shows how you can configure a value of 1024:

<jsp-config>
				<property name=”initial-capacity” value=”1024” >
</jsp-config>

Internationalization Elements

Internationalization elements are as follows:

parameter-encoding

Specifies a hidden field or default charset that determines the character encoding the web container. This web container is used to decode parameters for request.getParameter calls when the charset is not set in the request's Content-Type.

For encodings you can use, see:

http://java.sun.com/j2se/1.4.2/docs/guide/intl/encoding.doc.html

Subelements

none

Attributes

The following table describes attributes for the parameter-encoding element. The left column lists the attribute name, the middle column indicates the default value, and the right column describes what the attribute does.

Table 6–43 parameter-encoding Attributes


Attribute	Default Value	Description
`form-hint-field`	`j_encoding`	The value of the hidden field in the form that specifies the parameter encoding.
`default-charset`	none	This value is used for parameter encoding if neither `request.setCharacterEncoding()` is called nor `form-hint-field` is found in the request.

locale-charset-info

Specifies the mapping between the locale and the character encoding that should be set in the Content-type header of the response if a servlet or JSP sets the response locale using the ServletResponse.setLocale method. This overrides the web container's default locale-to-charset mapping.

Subelements

The following table describes subelements for the locale-charset-info element. The left column lists the subelement name, the middle column indicates the requirement rule, and the right column describes what the element does.

Table 6–44 locale-charset-info Subelements


Element	Required	Description
locale-charset-map	one or more	Maps a locale to a character set.
parameter-encoding	zero or one	Deprecated. Use the `parameter-encoding` element under `sun-web-app` instead. This is supported only for backward compatibility with applications developed under Sun Java System Application Server 7.

Attributes

The following table describes attributes for the locale-charset-info element. The left column lists the attribute name, the middle column indicates the default value, and the right column describes what the attribute does.

Table 6–45 locale-charset-info Attributes


Attribute	Default Value	Description
`default-locale`	none	Ignored in Sun Java System Web Server 6.1.

locale-charset-map

Maps a locale to a specific character encoding.

For encodings you can use, see:

http://java.sun.com/j2se/1.4.2/docs/guide/intl/encoding.doc.html

Attributes

The following table describes attributes for the locale-charset-map element. The left column lists the attribute name, the middle column indicates the default value, and the right column describes what the attribute does.

Table 6–46 locale-charset-map Attributes