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Apache Struts 2 Documentation
Application, Session, Request objects in jsp
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The application, session and request objects are available from within `s` tags in jsp wherever ognl can be evaluated. Use the #application, #session, or #request syntax to get the object and access values by their keys using ['key'].

Accessing scoped variables via <s:property.../> tags

Conversely, if you would like to make Struts 2 objects available to a JSP/JSTL scope, the `s:set` tag may be used like this:

Expose OGNL 'jobs' value to JSP/JSTL scope 'jobz'

"Auto-exposure"

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In Struts 2 OGNL values are automagically exposed to JSP/JSTL; using `<s:set.../>` as described above may not be necessary.

A full example below shows a struts variable "jobs" being exposed as "jobz" and being used with jstl and the display tag.

Exposing framework objects to JSTL, with a JSTL and DisplayTag Example