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