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https://issues.apache.org/struts/browse/WW-2339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43567#action_43567
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Greg Lindholm commented on WW-2339:
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I'm having this problem as well.
I'm displaying a list of checkboxes for account names:
<s:iterator value="accountInfoList" status="accountInfoStatus">
<s:checkbox name="accountIds" label="%{name}" value="%{enabled}"
fieldValue="%{id}" />
</s:iterator>
It then sets the array of selected account ids.
public void setAccountIds(Long[] accountIds)...
This works fine as long as at least one checkbox was selected.
If no checkboxes are selected then I get:
ERROR com.opensymphony.xwork2.interceptor.ParametersInterceptor:204 -
ParametersInterceptor - [setParameters]: Unexpected Exception caught setting
'accountIds' on 'class com.xyz.struts.MyAction: Error setting expression
'accountIds' with value 'false'
Did a little debugging and I think the problem is in the CheckboxInterceptor.
It's creating a new param to handle the not checked case, this isn't correct if
we have an array of checkboxes.
I think it needs to check if the parameter "__checkbox_xxx" value is an array
with size > 1 it should not create the new 'false' param.
If I can make this work I will submit the patch.
> empty checkbox list results in "Invalid field value for field" error when
> using Collection or array containing non-boolean values.
> ----------------------------------------------------------------------------------------------------------------------------------
>
> Key: WW-2339
> URL: https://issues.apache.org/struts/browse/WW-2339
> Project: Struts 2
> Issue Type: Bug
> Components: Core Interceptors
> Affects Versions: 2.0.11
> Environment: Tomcat 6, XWork 2.0.4
> Reporter: Mike Calmus
> Fix For: Future
>
>
> I have an action that has a "selectedPageItems" element of type List<Long>.
> Using a JSp containing several checkboxes with value attributes of type Long,
> I receive an "Invalid field value for field" error when no items are selected.
> The CheckboxInterceptor class has the following code block:
> // is this checkbox checked/submitted?
> if (!parameters.containsKey(name)) {
> // if not, let's be sure to default the value to false
> newParams.put(name, uncheckedValue);
> }
> This causes a single boolean (or String) value to be added to the parameter
> list when no values are selected. This works fine if the Collection holds
> String or boolean values. However, in my situation the value can not be
> assigned to the Collection, giving the error.
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