1 Reply Latest reply on Nov 12, 2007 8:32 AM by Pete Muir

    EntityQuery.resultList contains all nulls after AJAX request

    Alex Savitsky Novice

      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