java - Struts validation error: "Got result of null when trying to get Boolean" -

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i have action class , validation in xml. validation successful except one:

<field name="dealboardrequestdto.contracttype">     <field-validator type="fieldexpression">         <param name="expression">             <![cdata[((dealboardrequestdto.contracttype!=null) ,                       (dealboardrequestdto.contracttype.size()>0) ,                        (!dealboardrequestdto.contracttype.contains(0))                      )]]>         </param>         <message key="invalid.fieldvalue.dealboardrequestdto.contracttype" />     </field-validator> </field>

got following error in console:

fieldexpressi w com.opensymphony.xwork2.util.logging.commons.commonslogger warn got result of null when trying boolean.

in dealboardrequestdto class there list<integer> of contracttype getters , setters. if not use validation above code ok , contracttype updated. in action class there map<integer, string> field contracttype.

why error occurring?


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