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From "Robert Taylor" <rtay...@mulework.com>
Subject RE: DynaActionForm and ArrayList : IndexOutOfBoundsException
Date Tue, 27 Jul 2004 11:28:56 GMT
This problem has been discussed many times on this list.
I recommend you search the archives.

In the mean time, have a look at using a lazy list.

http://jakarta.apache.org/commons/collections/apidocs-COLLECTIONS_3_1/org/apache/commons/collections/ListUtils.html#lazyList(java.ut
il.List,%20org.apache.commons.collections.Factory)

You can place the lazy list invocation in the forms reset() so
that a new lazy list gets created upon each call to reset().

In short the lazy list will use a designated factory to create
an object an populate a list whose indexed location is null.


There are other solutions as well.

hth,

robert

> -----Original Message-----
> From: jean michel corne [mailto:jmcorne@spiderbusiness.com]
> Sent: Tuesday, July 27, 2004 4:23 AM
> To: user@struts.apache.org
> Subject: DynaActionForm and ArrayList : IndexOutOfBoundsException
>
>
> Hi Struts users,
>
> I have tried to use ArrayList in the DynaActionForm with Struts 1.1.
>
> Before the action is processed (processActionForm), I got an error:
> java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
>         java.util.ArrayList.RangeCheck(ArrayList.java:507)
>         java.util.ArrayList.get(ArrayList.java:324)
>         org.apache.struts.action.DynaActionForm.get(DynaActionForm.java:298)
>         org.apache.commons.beanutils.PropertyUtils.getIndexedProperty(PropertyUtils.java:474)
>         org.apache.commons.beanutils.PropertyUtils.getIndexedProperty(PropertyUtils.java:428)
>         org.apache.commons.beanutils.PropertyUtils.getNestedProperty(PropertyUtils.java:770)
>         org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.java:801)
>         org.apache.commons.beanutils.BeanUtils.setProperty(BeanUtils.java:881)
>         org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:808)
>         org.apache.struts.util.RequestUtils.populate(RequestUtils.java:1252)
>         org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:821)
>         org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:254)
>         org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
>         org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
>         javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
>         javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
>
>
> struts-config.xml :
> <?xml version="1.0" encoding="UTF-8"?>
> <!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration
1.1//EN"
> "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">
> <struts-config>
>
>     <!-- ========== Form Bean Definitions ================================== -->
>     <form-beans>
>       <form-bean name="CalendarForm" type="fr.sipe.test.forms.CalendarForm" />
>       <form-bean name="purchaseOrderBeanForm" type="org.apache.struts.validator.DynaValidatorForm"><!--
> org.apache.struts.action.DynaActionForm-->
>             <form-property name="lines" type="fr.sipe.test.forms.POLine[]" size="4"
/>
>             <form-property name="arrayLines" type="java.util.ArrayList" size="4" />
>             </form-bean>
>     </form-beans>
>
>     <!-- ========== Global Exception Definitions ============================== -->
>     <global-exceptions />
>
>     <!-- ========== Global Forward Definitions =============================== -->
>     <global-forwards type="org.apache.struts.action.ActionForward">
>         <forward name="calendarStyle" path="/css/calendar.css" />
>         <forward name="calendarJs" path="/js/calendar.js" />
>         <forward name="error" path="/error.jsp" />
>     </global-forwards>
>
>     <!-- ========== Action Mapping Definitions =============================== -->
>     <action-mappings type="org.apache.struts.action.ActionMapping">
>       <action
>              input="/calendar.jsp"
>          name="CalendarForm"
>          path="/ViewCalendar"
>          scope="request"
>          type="fr.sipe.test.actions.ViewCalendarAction" >
>          <forward name="Success" path="/calendar.jsp" />
>       </action>
>
>         <action
>             path="/generateBeanPOForm"
>           input="/purchaseOrderBean.jsp"
>             type="fr.sipe.test.actions.GenerateBeanPOForm"
>           name="purchaseOrderBeanForm"
>           scope="request" >
>           <forward name="success" path="/purchaseOrderBean.jsp" redirect="false"/>
>         </action>
>
>         <action
>             path="/generateBeanPO"
>             type="fr.sipe.test.actions.GenerateBeanPO"
>           name="purchaseOrderBeanForm"
>           scope="request"
>           input="/purchaseOrderBean.jsp">
>           <forward name="success" path="/displayPurchaseOrderBean.jsp" redirect="false"/>
>         </action>
>     </action-mappings>
>
>       <message-resources parameter="resources.application" null="false" />
>
>     <controller processorClass="org.apache.struts.action.RequestProcessor" contentType="text/html"/>
> </struts-config>
>
>
>
> I'ved download the source code and traced the calls. The method that returns this error
is located in the class
> BeanUtils.setProperty(Object bean, String name, Object value)
> At the call:                target = PropertyUtils.getProperty(bean, name.substring(0,
delim));
>
> The bean is created but the size of the ArrayList is 0, so when calling the first property
at indexed 0, I got an error.
>
> Do you have any idea how to solve this problem (without using POJO array like myBean[])?
>
> Thanks for your help
> Jean-Michel
>
>


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