What Are the Causes For Validation to Throw ClassCastException?

[Caroline Jen]

Do not understand the 'HTTP Status 500 -
java.lang.ClassCastException 
org.apache.struts.validator.DynaValidatorForm.validate(DynaValidatorForm.java:141)'


1. I have this plug-in by the very end of the
struts-config.xml file:

<plug-in
className="org.apache.struts.validator.ValidatorPlugIn">
   <set-property
       property="pathnames"
           
value="/WEB-INF/validator-rules.xml,/WEB-INF/validation.xml"/>
</plug-in>

2. I have this action mapping in the struts-config.xml
file:

    <action
        path="/content/UpdateTitle"
        type="org.dhsinfo.content.doSomething1"
        name="editTitleForm"
        scope="request"
        validate="true"
        input=".frame.content">
       <forward
           name="success"
           path=".title.Confirmation"/>
    </action>

3. I have this <form-bean> inside the <form-beans>
element in the struts-config.xml file:

     <form-bean
        name="editTitleForm"
       
type="org.apache.struts.validator.DynaValidatorForm">
          <form-property
            name="page"
            type="java.lang.String"/>
          <form-property
            name="title"
            type="java.lang.String"/>
     </form-bean>

4. I have the validation.xml file in the
AppName/WEB-INF directory

4.1. I changed the beginning of the validation.xml
file to
"http://jakarta.apache.org/commons/dtds/validator_1_1_3.dtd";
):

4.2 my validation.xml file code is shown below

I got the HTTP Status 500 -
Servlet.service() for servlet action threw exception

java.lang.ClassCastException 
org.apache.struts.validator.DynaValidatorForm.validate(DynaValidatorForm.java:141)

code:

<?xml version="1.0" encoding="ISO-8859-1" ?>

<!DOCTYPE form-validation PUBLIC
          "-//Apache Software Foundation//DTD Commons
Validator Rules Configuration 1.0//EN"
         
"http://jakarta.apache.org/commons/dtds/validator_1_1_3.dtd";>
<form-validation>
   <global>
      <constant>
         <constant-name>postalCode</constant-name>
         <constant-value>^\d{5}\d*$</constant-value>  
      </constant>
   </global>

  <formset>

      <form name="editTitleForm">
         <field
            property="page"
            depends="required">
               <arg0 key="request.page"/>
         </field>
         <field
            property="title"
            depends="required">
               <arg0 key="insert.title"/>
         </field>
      </form>
   </formset>
</form-validation>
      



                
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