[jboss-user] [JBoss Seam] - EntityQuery.resultList contains all nulls after AJAX request

[ASavitsky]

This one drives me crazy! If there's a list box backed by an EntityQuery, on the same page with an AJAX component (in my case it's RichFaces DataScroller/DataTable), then after several AJAX requests, the resultList for EntityQuery contains a list of nulls. It looks like every entity in the resultList is replaced with a null. I'm not sure whether it's Seam or RichFaces, but it's bound to be one or the other. 

Anyway, here's the setup: Seam 2 GA, RichFaces 3.1.2, Facelets 1.1.14, JSF RI 1.2.05, Hibernate 3.2.5 GA.

The entites A and B are identical in structure (though they can be different, for as much as this bug cares):

@Entity
  | public class A implements Serializable {
  | 	@Id
  | 	private String name;
  | 
  | 	public String getName() {
  | 		return name;
  | 	}
  | }

The EntityQuery's:
	<core:init debug="false" />
  | 	<core:manager conversation-timeout="120000" concurrent-request-timeout="500" />
  | 	<persistence:entity-manager-factory name="testDatabase" />
  | 	<persistence:managed-persistence-context name="entityManager"
  | 		entity-manager-factory="#{testDatabase}" auto-create="true" />
  | 	<transaction:entity-transaction entity-manager="#{entityManager}" />
  | 	<framework:entity-query name="listOfA" scope="conversation" ejbql="FROM A a" order="name" />
  | 	<framework:entity-query name="listOfB" scope="conversation" ejbql="FROM B b" order="name" />
  | 	<security:identity authenticate-method="#{authenticator.authenticate}" />
  | 	<web:ajax4jsf-filter force-parser="false" enable-cache="true" class="org.ajax4jsf.FastFilter" />

Now, the Facelets page:
<h:form xmlns="http://www.w3.org/1999/xhtml"
  | 	xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core"
  | 	xmlns:s="http://jboss.com/products/seam/taglib" xmlns:r="http://richfaces.org/rich">
  | 	<r:dataTable id="list" var="a" value="#{listOfA.resultList}" rows="4">
  | 		<r:column>
  | 			<h:commandLink action="Dummy" value="#{a.name}" />
  | 		</r:column>
  | 	</r:dataTable>
  | 	<r:datascroller align="left" maxPages="1" for="list" fastControls="auto" />
  | 	<br />
  | 	<h:selectOneMenu value="#{notImportantHere}">
  | 		<s:selectItems value="#{listOfB.resultList}" var="b" label="#{b.name}" noSelectionLabel="Select one..." />
  | 		<s:convertEntity />
  | 	</h:selectOneMenu>
  | </h:form>

Pretty simple - there's a scrollable datatable for entity A, and a dropdown for entity B. Now, when user activates the datascroller twice, and then selects an A from the data table, the list of Bs is empty - it contains the same # of entries as before, but they are all empty.

Has anyone ever encountered such behavior before? Is this a bug? I myself have seen it before, with a different AJAX component (it was a RichFaces suggestion box that time), but dismissed it on the notion that "what else could you expect from a beta" (Seam was B2 at the time)?

Thanks in advance,

Alex

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