How to do validation for dynamically creating Multiple Fields

[Bharathiraja]

hi everybody,
  
 In my application, i am having multilines with facility for adding multiline 
dynamically .I representing those fields through nested tags.These tag gets set 
through array of  Objects. 


So in this  scenario how can i validate my multiline fields.

if i add new row and try to save it ,it throws exception in 

populating saying IndexOutOfBound.


 Please anybody help me to get rid of this problem.


Please give me suggestion whether my Form Bean and Jsp is correct for my requirement.

FormBean
---------------



private List multilineObjects=getObjects();



 public void setMultilineObjects(List multilineObjects){
   
       this.multilineObjects=multilineObjects;
    }
    
    public List getMultilineObjects(){
     return multilineObjects;
    }

    public List getObjects(){
   
     MultilineObjects[] obj=null;

     ArrayList  listOfObjects=null;
  
   try{
       
        listOfObjects= businessObjects.getOnLoadObjects();
         
        }catch(Exception e){
     
       e.printStackTrace();
     }
      return listOfObjects;
    }
}


    
MyJSP
---------

<nested:iterate id="lineElement" property="multilineObjects" scope="request" >


<tr>

<td width="20%">


<nested:text property="moduleName" style="width:99%" styleClass="LinesTextboxFont" />



<nested:hidden name="lineElement" property="moduleId" />


</td>

<td width="21%" >

<nested:text readonly="true" property="shortName" style="width:99%" 
styleClass="LinesTextboxFont"/> 

</td>

<td width="20%" >

<nested:text property="directory" style="width:99%" styleClass="LinesTextboxFont"/>

</td>

<td width="21%">

<nested:text property="startDate" style="width:99%" styleClass="LinesTextboxFont"/>

</td>

<td width="20%">

<nested:text property="endDate" style="width:99%" styleClass="LinesTextboxFont"/>

<nested:hidden property="whoColumn" />

</td>

</tr>


</nested:iterate>



MyValidation.xml

--------------------------

<form name="MultiLineForm" >

<field property="moduleName" indexedListProperty="echainModule" depends="required" >

<arg0 key="key.label.module" />

</field>

</form> 

Exception Details

--------------------------

java.lang.IndexOutOfBoundsException: Index: 25, Size: 24
        at java.util.ArrayList.RangeCheck(ArrayList.java:508)
        at java.util.ArrayList.get(ArrayList.java:320)
        at 
org.apache.commons.beanutils.PropertyUtils.getIndexedProperty(PropertyUtils.java:521)
        at 
org.apache.commons.beanutils.PropertyUtils.getIndexedProperty(PropertyUtils.java:428)
        at 
org.apache.commons.beanutils.PropertyUtils.getNestedProperty(PropertyUtils.java:770)
        at 
org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.java:801)
        at org.apache.commons.beanutils.BeanUtils.setProperty(BeanUtils.java:881)
        at org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:808)
        at org.apache.struts.util.RequestUtils.populate(RequestUtils.java:1252)