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OGNL is the Object Graph Navigation Language (see http://www.ognl.org/ for the full documentation of OGNL). Here, we will cover a few examples of OGNL features that co-exist with the framework. To review basic concepts, refer to OGNL Basics.

The framework uses a standard naming context to evaluate OGNL expressions. The top level object dealing with OGNL is a Map (usually referred as a context map or context). OGNL has a notion of there being a root (or default) object within the context. In expression, the properties of the root object can be referenced without any special "marker" notion. References to other objects are marked with a pound sign (#).

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<s:property value="#session.mySessionPropKey"/> or
<s:property value="#session[WW:"mySessionPropKey"]"/> or
<s:property value="#request[WW:"mySessionPropKey"]/>

The ActionContext is also exposed to Action classes via a static method.

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