Java.lang.NullPointerException at oracle.jbo.uicli.binding.JUCtrlListBinding.findOrCreateLOVDialogIteratorBinding

Question

Our application is developed using JDev Version 11.1.2.1.0.. We have an 'inputComboboxListOfValues' component with the following code:
The source code from the page is hte follwoing:
  <af:inputComboboxListOfValues id="TypeLOVId" autoSubmit="true"
                                                              popupTitle="Search and Select: #{bindings.TypeLOV.hints.label}"
                                                              value="#{bindings.TypeLOV.inputValue}"
                                                              label="#{UIRes.TYPE}"
                                                              model="#{bindings.TypeLOV.listOfValuesModel}"
                                                              required="true"
                                                              columns="50"
                                                              inlineStyle="width:80pt;">
                                    <f:validator binding="#{bindings.TypeLOV.validator}"/>
                                    <af:autoSuggestBehavior suggestedItems="#{pageFlowScope.lovMB.typeSV}" />
      </af:inputComboboxListOfValues>
The source code of the binding from page definition is the following:
<listOfValues StaticList="false" IterBinding="TypIterator" Uses="LOV_TypeLOV" id="TypeLOV"/>
We got this following error yesterday when user tried to enter value in the the above mentioned combo box. This error occurred only once and it started working fine later. We are not able to recreate this error in development envronment even after disabling the pooling. We have no clues regarding what may have went wrong...
ADF_FACES-60096:Server Exception during PPR, #7[[
java.lang.NullPointerException
    at oracle.jbo.uicli.binding.JUCtrlListBinding.findOrCreateLOVDialogIteratorBinding(JUCtrlListBinding.java:5131)
    at oracle.adfinternal.view.faces.model.binding.FacesCtrlLOVBinding.getSearchBinding(FacesCtrlLOVBinding.java:201)
    at oracle.adfinternal.view.faces.model.binding.FacesCtrlLOVBinding$ListOfValuesModelImpl.getSearchRegion(FacesCtrlLOVBinding.java:1821)
    at oracle.adfinternal.view.faces.model.binding.FacesCtrlLOVBinding$ListOfValuesModelImpl.getQueryModel(FacesCtrlLOVBinding.java:1465)
    at oracle.adfinternal.view.faces.renderkit.rich.SimpleInputListOfValuesRendererBase$InternalLaunchPopupListener.processLaunch(SimpleInputListOfValuesRendererBase.java:1487)
    at oracle.adf.view.rich.event.LaunchPopupEvent.processListener(LaunchPopupEvent.java:108)
    at org.apache.myfaces.trinidad.component.UIXComponentBase.broadcast(UIXComponentBase.java:824)
    at org.apache.myfaces.trinidad.component.UIXEditableValue.broadcast(UIXEditableValue.java:243)
    at oracle.adf.view.rich.component.UIXInputPopup.broadcast(UIXInputPopup.java:157)
    at oracle.adf.view.rich.component.fragment.UIXRegion.broadcast(UIXRegion.java:159)
    at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent$1.run(ContextSwitchingComponent.java:130)
    at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent._processPhase(ContextSwitchingComponent.java:461)
    at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent.broadcast(ContextSwitchingComponent.java:134)
    at oracle.adf.view.rich.component.fragment.UIXInclude.broadcast(UIXInclude.java:112)
    at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent$1.run(ContextSwitchingComponent.java:130)
    at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent._processPhase(ContextSwitchingComponent.java:461)
    at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent.broadcast(ContextSwitchingComponent.java:134)
    at oracle.adf.view.rich.component.fragment.UIXInclude.broadcast(UIXInclude.java:106)
    at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.broadcastEvents(LifecycleImpl.java:1129)
    at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:353)
    at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:204)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)
    at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
    at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
    at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
    at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:173)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:122)
    at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468)
    at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
    at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468)
    at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:293)
    at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:199)
    at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:111)
    at java.security.AccessController.doPrivileged(AccessController.java:284)
    at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
    at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)
    at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94)
    at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:100)
    at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:136)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
    at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
    at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
    at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
    at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
    at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
    at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
The user had entered a value in the combo box, say '145' and tabbed out, which did not match any of the value in the drop down or the auto suggest and when it was trying to display the 'Search and Select' pop-up the error occurred.
Please advice on what could be the possible reason and the solution for the issue...

Answer 1

This kind of error is hard to diagnose. From the stacktrace I see that the creation of a list iterator definition failed, while the framework tried to create the search popup. However I can't see why. On reason would be passivation/activation problem, which you already have tested.
As you can't reproduce the error there is little we can do, sorry.
Timo