struts2 效验器 效验密码


<field name="c.password">
<field-validator type="requiredstring" >
<param name="trim">true</param>
<message key="password.invalid"></message>
</field-validator> <field-validator type="stringlength">
<param name="minLength">6</param>
<param name="maxLength">10</param>
<message key="password.length.invalid"></message>
</field-validator>
</field>
<field name="c.repassword">
<field-validator type="fieldexpression" >
<param name="expression"><![CDATA[(#parameters.c.password[0]==#parameters.c.repassword[0])]]></param><!--  此表达式值为ONGL表达式 -->
<message key="password.add.reqpassword.twosame"></message>
</field-validator>
</field><param name="expression"><![CDATA[(#parameters.c.password[0]==#parameters.c.repassword[0])]]></param>
怎么显式是空值：Got result of null when trying to get Boolean.
#c.password==#c.repassword  也不行 加request一样
有没谁遇到这种情况的  大家看看~~~