I am facing issue with Entity query when adding order by clause. not sure I should change anything else or it is a bug.

ver : jboss-4.2.3, jboss-seam-2.0.2.SP1

ExperimentTableIndexList.java returns experiment details.
Corresponding xhtml page (ExperimentTableIndexList.xhtml) works fine using default getEjbql without any order by clause
i.e. I can search or sort rich:dataTable without any error.

When I add order by clause in "getEjbql()" as below, and try to search or sort rich:dataTable on the basis of experiment name, it gives error as:
"javax.el.ELException: /ExperimentTableIndexList.xhtml @50,73 rendered="#{empty experimentTableIndexList.resultList}": Error reading 'resultList' on type com.novartis.bdm.proteomics.session.ExperimentTableIndexList_$$_javassist_3" which is
"<h:outputText value="The Experiment Table Index search returned no results."
               rendered="#{empty experimentTableIndexList.resultList}"/>"


ExperimentTableIndexList.java
-----------------------------
@Name("experimentTableIndexList")
public class ExperimentTableIndexList extends EntityQuery {

     private static final String[] RESTRICTIONS = {
               "lower(experimentTableIndex.experimentName) like concat('%',lower(#{experimentTableIndexList.experimentTableIndex.experimentName}),'%')",
               "lower(experimentTableIndex.experimentTableName) like concat('%',lower(#{experimentTableIndexList.experimentTableIndex.experimentTableName}),'%')",
               "lower(experimentTableIndex.dateCreated) like concat('%',lower(#{experimentTableIndexList.experimentTableIndex.dateCreated}),'%')",
               "lower(experimentTableIndex.protXml) like concat('%',lower(#{experimentTableIndexList.experimentTableIndex.protXml}),'%')",};

     private ExperimentTableIndex experimentTableIndex = new ExperimentTableIndex();

     @Override
     public String getEjbql() {
          //return "select experimentTableIndex from ExperimentTableIndex experimentTableIndex"; //THIS WORKS
          return "select experimentTableIndex from ExperimentTableIndex experimentTableIndex ORDER BY experimentTableIndex.experimentName";
     }

     /**@Override
     public Integer getMaxResults() {
          return 25;
     }**/

     public ExperimentTableIndex getExperimentTableIndex() {
          return experimentTableIndex;
     }

     @Override
     public List<String> getRestrictions() {
          return Arrays.asList(RESTRICTIONS);
     }

}

ExperimentTableList.xhtml
-------------------------
<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
                             "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:define name="body">
   
    <h:messages globalOnly="true" styleClass="message" id="globalMessages"/>   
    <h:form id="experimentTableIndexSearch" styleClass="edit">
   
        <rich:simpleTogglePanel label="ExperimentTableIndex search parameters" switchType="ajax">
       
            <s:decorate template="layout/display.xhtml">
                <ui:define name="label">Experiment Name</ui:define>
                <h:inputText id="experimentName" value="#{experimentTableIndexList.experimentTableIndex.experimentName}"/>
            </s:decorate>

            <s:decorate template="layout/display.xhtml">
                <ui:define name="label">Experiment Table Name</ui:define>
                <h:inputText id="experimentTableName" value="#{experimentTableIndexList.experimentTableIndex.experimentTableName}"/>
            </s:decorate>

            <s:decorate template="layout/display.xhtml">
                <ui:define name="label">ProtXml</ui:define>
                <h:inputText id="protXml" value="#{experimentTableIndexList.experimentTableIndex.protXml}"/>
            </s:decorate>

       
        </rich:simpleTogglePanel>
       
        <div class="actionButtons">
            <h:commandButton id="search" value="Search" action="/ExperimentTableIndexList.xhtml"/>
        </div>
       
    </h:form>
   
    <rich:panel>
        <f:facet name="header">Experiment Table List</f:facet>
    <div class="results" id="experimentTableIndexList">

    <h:outputText value="The Experiment Table Index search returned no results."
               rendered="#{empty experimentTableIndexList.resultList}"/>
              
    <rich:dataTable id="experimentTableIndexList"
                var="experimentTableIndex"
              value="#{experimentTableIndexList.resultList}"
           rendered="#{not empty experimentTableIndexList.resultList}">
        <h:column>
            <f:facet name="header">
                <s:link styleClass="columnHeader"
                             value="Exp Table Id #{experimentTableIndexList.order=='expTableId asc' ? messages.down : ( experimentTableIndexList.order=='expTableId desc' ? messages.up : '' )}">
                    <f:param name="order" value="#{experimentTableIndexList.order=='expTableId asc' ? 'expTableId desc' : 'expTableId asc'}"/>
                </s:link>
            </f:facet>
            #{experimentTableIndex.expTableId}
        </h:column>
        <h:column>
            <f:facet name="header">
                <s:link styleClass="columnHeader"
                             value="Experiment Name #{experimentTableIndexList.order=='experimentName asc' ? messages.down : ( experimentTableIndexList.order=='experimentName desc' ? messages.up : '' )}">
                    <f:param name="order" value="#{experimentTableIndexList.order=='experimentName asc' ? 'experimentName desc' : 'experimentName asc'}"/>
                </s:link>
            </f:facet>
            #{experimentTableIndex.experimentName}
        </h:column>
        <h:column>
            <f:facet name="header">
                <s:link styleClass="columnHeader"
                             value="Experiment Table Name #{experimentTableIndexList.order=='experimentTableName asc' ? messages.down : ( experimentTableIndexList.order=='experimentTableName desc' ? messages.up : '' )}">
                    <f:param name="order" value="#{experimentTableIndexList.order=='experimentTableName asc' ? 'experimentTableName desc' : 'experimentTableName asc'}"/>
                </s:link>
            </f:facet>
            #{experimentTableIndex.experimentTableName}
        </h:column>
        <h:column>
            <f:facet name="header">
                <s:link styleClass="columnHeader"
                             value="ProtXml #{experimentTableIndexList.order=='protXml asc' ? messages.down : ( experimentTableIndexList.order=='protXml desc' ? messages.up : '' )}">
                    <f:param name="order" value="#{experimentTableIndexList.order=='protXml asc' ? 'protXml desc' : 'protXml asc'}"/>
                </s:link>
            </f:facet>
            #{experimentTableIndex.protXml}
        </h:column>
        <h:column>
            <f:facet name="header">
                <s:link styleClass="columnHeader"
                             value="Date Created #{experimentTableIndexList.order=='dateCreated asc' ? messages.down : ( experimentTableIndexList.order=='dateCreated desc' ? messages.up : '' )}">
                    <f:param name="order" value="#{experimentTableIndexList.order=='dateCreated asc' ? 'dateCreated desc' : 'dateCreated asc'}"/>
                </s:link>
            </f:facet>
            #{experimentTableIndex.dateCreated}
        </h:column>
        <!--<h:column>
            <f:facet name="header">action</f:facet>
            <s:link view="/#{empty from ? 'ExperimentTableIndex' : from}.xhtml"
                   value="Select"
                      id="experimentTableIndex">
                <f:param name="experimentTableIndexExpTableId"
                        value="#{experimentTableIndex.expTableId}"/>
            </s:link>
        </h:column>-->
    </rich:dataTable>

    </div>
    </rich:panel>
   
    <div class="tableControl">
     
        <s:link view="/ExperimentTableIndexList.xhtml"
            rendered="#{experimentTableIndexList.previousExists}"
               value="#{messages.left}#{messages.left} First Page"
                  id="firstPage">
          <f:param name="firstResult" value="0"/>
        </s:link>
       
        <s:link view="/ExperimentTableIndexList.xhtml"
            rendered="#{experimentTableIndexList.previousExists}"
               value="#{messages.left} Previous Page"
                  id="previousPage">
            <f:param name="firstResult"
                    value="#{experimentTableIndexList.previousFirstResult}"/>
        </s:link>
       
        <s:link view="/ExperimentTableIndexList.xhtml"
            rendered="#{experimentTableIndexList.nextExists}"
               value="Next Page #{messages.right}"
                  id="nextPage">
            <f:param name="firstResult"
                    value="#{experimentTableIndexList.nextFirstResult}"/>
        </s:link>
       
        <s:link view="/ExperimentTableIndexList.xhtml"
            rendered="#{experimentTableIndexList.nextExists}"
               value="Last Page #{messages.right}#{messages.right}"
                  id="lastPage">
            <f:param name="firstResult"
                    value="#{experimentTableIndexList.lastFirstResult}"/>
        </s:link>
       
    </div>   
</ui:define>

</ui:composition>