Struts 2 OGNL - Comparing two string values in validation.xml

Question

I am new to Struts2 and OGNL and am making a simple web application with a registration page. There are two fields, password and repassword (to re-enter the password) and using the validation framework i would like to validate that the two passwords match (I know that I can do it easily with JavaScript). Here is what I've got so far. All of the field-validators are working fine. This is my first non-field validator and I just cant get it to work.

<validator type="expression">
    <param name="expression">${password}!=${repassword}</param>
    <message>Passwords must match.</message>
</validator>

I tried both with

${password}!=${repassword}

and without

password!=repassword

the OGNL tags.

Aleksandr M · Accepted Answer · 2013-03-02T11:01:01.297

3

The expression validator is a Non-Field Level validator. Use fieldexpression validator which is a Field Level validator and validates using OGNL expression. And it must be equals (==) check.

<field name="password">
  <field-validator type="fieldexpression">
    <param name="expression"><![CDATA[password == repassword]]></param>
    <message>Passwords must match.</message>
  </field-validator>
</field>

The expression validator adds action errors. The fieldexpression validator adds field errors.

edited Mar 02 '13 at 11:01

answered Mar 01 '13 at 09:04

Aleksandr M

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That worked! Thank you. I would still like to understand how to make it work as an expression validator. The two links above seem to be describing the same functionality just in different words. – Ben Lamm Mar 01 '13 at 17:54
@BLam85: Updated my answer a little bit. You can use expression validator but to view errors in JSP you need to use `` tag. – Aleksandr M Mar 02 '13 at 11:03

score 2 · Answer 2 · answered Feb 28 '13 at 22:55

2

try

%{password == repassword}

The validator checks to boolean OGNL expression that both are equal.

answered Feb 28 '13 at 22:55

Roman C

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That did not work... as expected. The validator failed whether or not the passwords matched. (i.e. The action returned input) However the message was never displayed and i see the following warning in the console `Mar 1, 2013 12:59:28 PM com.opensymphony.xwork2.util.logging.commons.CommonsLogger warn WARNING: Got result of null when trying to get Boolean.` – Ben Lamm Mar 01 '13 at 18:03
This OGNL expression evaluates to true if the values match. – Roman C Mar 01 '13 at 18:15

Struts 2 OGNL - Comparing two string values in validation.xml

2 Answers2