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Using struts tag, retrieve value from Map & Vector

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Using Struts tag, we normally refer value of bean value as
<html:text property="bean.field" name="dynaform"/>
Similarly to get value from an object containing vector holds again other objects, to retrieve first objects field value, can be written as
<html:text property ="obj1.vectorName[0].fieldName" name="dynaForm"/>

Now,in case, if a hashmap contains a vector which holds bean, how can we use above tag in that case...
I tried like
<html:text property="mapName(key).[vectorIndex].fieldName" name="dynaName" />
But it doesn't seem to be working..
Any help willbe appreciated.

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