Can you specify a Collection as a inputHidden value?

Question

I am trying to set an inputHidden field to a List in a JSF Facelets page. However the list is always set to null in the backing bean after the page is submitted.
Code:
     <h:inputHidden value="#{controllerObj['ttyList']}" />
     <h:inputHidden value="#{controllerObj['emailList']}" />
</a4j:form>
Can a inputHidden field be used to hold a Collection such as an ArrayList?
Thanks in Advance?

Answer 1

Glad you fixed it.
Though, for future reference I would add some more background information:
The HTML response isn't anything else than one big String (a big character array). Also the HTTP request parameters can't contain anything else than Strings. Before writing to the response stream, all non-String typed objects are forced to their string representation using Object#toString().
JSF is smart enough to convert (coerce) between String and Number/Boolean itself, but for other object types, such as List, you'll have to implement and specify a javax.faces.convert.Converter. In the getAsObject() method you write logic to convert from String to List (or any other object type). In the getAsString() method you write logic to convert from List (or any other object type) to String. Finally define this converter in the faces-config.xml. You can use the <converter-for-class> entry to do it 'transparently' in all JSF pages, you can also use <converter-id> entry to define the converter in the associated UIInput component yourself using the converterId attribute or the f:converter facet.