Strange behaviour -- [s:property] modifies Map???

[saint_john <sa...@mail.ru>]

Hi, 

I've encountered very strange behaviour of struts: 
<s:property value="myMap['testKey']"/> adds new entry to myMap - ('testKey',
''). Why??

Details:

...in My action:
private Map<String, String> myMap = new HashMap<String, String>();  // it's
empty

...in jsp:
<s:property value="myMap"/>   // displays  {}  - it's ok because is empty
<s:property value="myMap['testKey']"/>  // displays  nothing  as it should
be
<s:property value="myMap"/>   // displays {testKey=}  - ?? WHY? 

What's wrong?

Thanks
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