The reason you get the null pointer exception is that the "inventoryList"
property in your DynaActionForm is created empty. The exception occurs
when Struts tries to populate inventoryList[0].startNumber or
inventoryList[0].endNumber.
Even though I haven't used the DynaActionForm, I know that it will have the
same limitations/requirements for populating indexed properties as an
ActionForm. I know that some folks use a LazyList for processing their
indexed properties. Perhaps that will help you.
The reason you don't get the exception with the name iList is that struts
makes no attempt to populate the ArrayList in your DynaActionForm.
Can't provide an answer...but I can see the why to your problem
Nick
"Nifty Music"
<[EMAIL PROTECTED]> To: [EMAIL PROTECTED]
cc:
12/10/2003 01:33 Subject: RE: dynamically sized form
(mostly solved)
PM
Please respond to
"Struts Users
Mailing List"
I apologize in advance if this comes through twice. Our email server was
having issues this morning, so I'm resending it in case it didn't make it
out the first time. Thanks!
I am attempting to do something similar to what has been posted here in the
current Struts application that I'm working on. I'm using a
DynaValidatorForm in request scope, iterating through a dynamically
generated ArrayList that I've put into the DynaValidatorForm, and then
attempting to pass it through request scope using indexed properties. The
page displays perfectly, but when I try to submit it, I get the following
error:
[Servlet Error]-[BeanUtils.populate]: java.lang.NullPointerException: No
indexed value for 'inventoryList[0]'
at org.apache.struts.action.DynaActionForm.get(DynaActionForm.java:293)
at
org.apache.commons.beanutils.PropertyUtils.getIndexedProperty(PropertyUtils.java:474)....
Here are some snippets of code:
>From the ActionClass that populates the .JSP:
ArrayList itemRanges = itemCDTO.getItemRanges(); //returns an ArrayList of
ItemRange beans
form.set("inventoryList", itemRanges);
>From struts-config.xml:
<form-bean name="inventoryModifyForm" type
="org.apache.struts.validator.DynaValidatorForm">
<form-property name="page" type="java.lang.Integer" />
<form-property name="submit" type="java.lang.String" />
<form-property name="rangeStart" type="java.lang.String" />
<form-property name="rangeEnd" type="java.lang.String" />
<form-property name="inventoryList" type="java.util.ArrayList" />
<form-property name="description" type="java.lang.String" />
</form-bean>
<action path="/inventoryModify"
type="gov.dor.fastr.action.inventory.InventoryModifyAction"
name="inventoryModifyForm"
scope="request"
input="inventory.modify"
validate="false">
<forward name="cancelled" path="inventory.cancelled" />
<forward name="page2" path="inventory.modify2" />
</action>
>From the JSP:
<logic:iterate id="inventoryList" name="inventoryModifyForm" property
="inventoryList" >
<tr>
<td>
<html:text indexed="true" name="inventoryList" property="startNumber" />
<html:text indexed="true" name="inventoryList" property="endNumber" />
</td>
</tr>
</logic:iterate>
An interesting thing I noticed when I change the code in the JSP like this:
<logic:iterate id="iList" name="inventoryModifyForm" property
="inventoryList" >
<tr>
<td>
<html:text indexed="true" name="iList" property="startNumber" />
<html:text indexed="true" name="iList" property="endNumber" />
</td>
</tr>
</logic:iterate>
....then I don't get the error. But of course, when I do an (ArrayList)
form.get("inventoryList"), it returns an empty List to the Action class. I
can, however, bypass the DynaValidatorForm and directly query the
HttpServletRequest object and pull the individual components by doing a
request.getParameter("iList[0].startNumber"), which is extremely clunky.
I'm sure I must be missing something stupid. If anyone can shed some light,
it would be greatly appreciated.
Thanks so much!
Brent
-----Original Message-----
From: Yee, Richard K,,DMDCWEST [<mailto:[EMAIL PROTECTED]>]
Sent: Friday, November 21, 2003 4:23 PM
To: 'Struts Users Mailing List'
Subject: RE: dynamically sized form (mostly solved)
Matt,
You actually only need the form in the request. You don't need the property
of the form at all in your JSP.
In my JSP I use
<html:form action="/indexTestSubmitAction">
<logic:iterate id="testBean" name="dynaIndexTestForm" property="tests"
indexId="ctr" >
<html:text name="testBean" property="id" /><br>
<html:text name="testBean" property="amount" /><br>
<html:text name="testBean" property="name"/>
</logic:iterate>
<html:submit value="Update"/>
</html:form>
In struts-config.xml I have this
<form-beans>
<form-bean name="dynaIndexTestForm"
type="org.apache.struts.action.DynaActionForm">
<form-property name="tests"
type="mil.osd.dmdc.deers.tests.beans.TestBean[]"/>
</form-bean>
</form-beans>
<action-mappings>
<action path="/indexTestSubmitAction"
type="mil.osd.dmdc.deers.apps.test.actions.TestAction"
name="dynaIndexTestForm" scope="request" input="/loginSucceeded.jsp">
<forward name="success" path="/succeeded.jsp" redirect="false"/>
</action>
</action-mappings>
-Richard
-----Original Message-----
From: Matt Bathje [<mailto:[EMAIL PROTECTED]>]
Sent: Friday, November 21, 2003 2:17 PM
To: Struts Users Mailing List
Subject: Re: dynamically sized form (mostly solved)
> I found out that using new DynaActionForm()inside of the
> PreLoaderAction.execute() doesn't work. It gives a null pointer
> exception when you try and call the set() method.
>
> You need to do this instead:
>
> FormBeanConfig cfg = mapping.getModuleConfig()
> .findFormBeanConfig("dynaIndexTestForm");
> DynaActionForm myForm;
>
Richard - this was the last piece of the puzzle for me, now it works
without
having to supply the name="form" on the preloader action...sweet.
Mark - I have had it working both ways now, in session and request. If you
want to do it in request you have to have 2 request objects in your
preload.
The first is the form itself, and the second is the property for the form
(which is what you actually loop through in your jsp)
I will probably use the request scope myself just because I try to stay out
of session as much as possible.
Thanks,
Matt Bathje
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