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ActionContext.getContext().getSession().put("mySessionPropKey", mySessionObject);

<ww: property value="#session.mySessionPropKey"/> or
<ww: property value="#session['mySessionPropKey']"/> or
<ww: property value="#attr.mySessionPropKey"/>

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Dealing with collections(maps, lists, and sets) in webwork comes often, so here are a few examples using the select tag:
Syntax for list: {e1,e2,e3}. This creates a List containing the String "name1", "name2" and "name3". It also selects "name2" as the default value. Notice the use of the Alt Syntax to provide the literal "name2".

<webwork<ww:select label="label" name="name" list="{'name1','name2','name3'}" value="%{'name2'}" />

Syntax for map: #{key1:value1,key2:value2}. This creates a map that maps the string "foo" to the string "foovalue" and "bar" to the string "barvalue":

<webwork<ww:select label="label" name="name" list="#{'foo':'foovalue', 'bar':'barvalue'}" />

You may need to determine if an element exists in a collection. You can accomplish this with the operations in and not in

<ui<ww:if test="'foo' in {'foo','bar'}">
   muhahaha
</uiww:if>
<ui<ww:else>
   boo
</uiww:else>

<ui<ww:if test="'foo' not in {'foo','bar'}">
   muhahaha
</uiww:if>
<ui<ww:else>
   boo
</uiww:else>

To select a subset of a collection (called projection), you can use a wildcard within the collection.

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