Validation Error after updating a SelectOneMenu via Ajax (DWR)

Question

I have a <t:selectOneMenu> that is bound to a backing bean together with a <f:selectItems> that is bound to a SelectItems[] attribute in the same backing bean. See below:
<t:selectOneMenu forceId="true"
id="department"
value="#{DeptBean.departmentId}">
<f:selectItems value="#{DeptBean.departmentList}" />
</t:selectOneMenu>
When the user changes another field on my page, I use DWR to retrieve a new list of departments and update the <t:selectOneMenu> accordingly. That works just fine.
The problem is that if I select a value from the updated department list and then submit the page I get a "Validation Error".
I suspect that the JSF Component Tree still has the old list of values and does some validation which obviously fails.
Has anyone dealt with this before? Any ideas would be appreciated!

Answer 1

<t:selectOneMenu forceId="true"
id="department"
value="#{DeptBean.departmentId}">
<f:selectItems value="#{DeptBean.departmentList}"
/>
</t:selectOneMenu>What is the type of departmentId ? If it is not a String, then try making it a String and see if the issue is resolved. I am not sure if this will help you. But its worth a try.