Sun Java System Application Server Platform Edition 8.1 2005Q2 Update 2 Developer's Guide

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# K

## key-field

Specifies a component of the key used to look up and extract cache entries. The web container looks 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 2.4 specification, section SRV 4.4, for details on the Servlet Path.

### Superelements

cache-mapping (`sun-web.xml`)

### Subelements

none

### Attributes

The following table describes attributes for the `key-field` element.

Table A–52 `key-field` Attributes

Attribute | Default | Description
--- | --- | ---
`name` | none | Specifies the input parameter name.
`scope` | `request.parameter` | (optional) Specifies the scope from which the input parameter is retrieved. Allowed values are `context.attribute`, `request.header`, `request.parameter`, `request.cookie`, `session.id`, and `session.attribute`.

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