Tree table-initially expand all nodes raises error when closing a node 11g

Question

Hello,
Frank Nimphius posted a blog entry about how to initially display all the nodes in a tree or table here:
[http://thepeninsulasedge.com/frank_nimphius/2007/12/19/adf-faces-rc-initially-expanding-all-nodes-in-a-tree-or-tree-table/|http://thepeninsulasedge.com/frank_nimphius/2007/12/19/adf-faces-rc-initially-expanding-all-nodes-in-a-tree-or-tree-table/]
This works very well. However, when the user tries to close a node, a NullPointerException is thrown.
Below is the stacktrace.
Does anyone know how to work around that issue?
java.lang.NullPointerException
     at org.apache.myfaces.trinidad.model.RowKeySetTreeImpl$Search.find(RowKeySetTreeImpl.java:608)
     at org.apache.myfaces.trinidad.model.RowKeySetTreeImpl._setContained(RowKeySetTreeImpl.java:496)
     at org.apache.myfaces.trinidad.model.RowKeySetTreeImpl.add(RowKeySetTreeImpl.java:97)
     at oracle.adfinternal.view.faces.renderkit.rich.TableRendererUtils.decodeDisclosedRowKeys(TableRendererUtils.java:774)
     at oracle.adfinternal.view.faces.renderkit.rich.table.BaseTableRenderer.decodeIncompatiblePropertyKey(BaseTableRenderer.java:198)
     at oracle.adf.view.rich.render.RichRenderer.decode(RichRenderer.java:203)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.__rendererDecode(UIXComponentBase.java:1089)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.decode(UIXComponentBase.java:714)
     at org.apache.myfaces.trinidad.component.UIXTreeTable.decode(UIXTreeTable.java:133)
     at org.apache.myfaces.trinidad.component.UIXCollection.processDecodes(UIXCollection.java:193)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl$ApplyRequestValuesCallback.invokeContextCallback(LifecycleImpl.java:1113)
     at org.apache.myfaces.trinidad.component.UIXCollection.invokeOnComponent(UIXCollection.java:1030)
     at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:731)
     at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:731)
     at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent.invokeOnComponent(ContextSwitchingComponent.java:153)
     at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:731)
     at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:731)
     at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:731)
     at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent.invokeOnComponent(ContextSwitchingComponent.java:153)
     at oracle.adf.view.rich.component.fragment.UIXPageTemplate.invokeOnComponent(UIXPageTemplate.java:208)
     at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:731)
     at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:731)
     at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:731)
     at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:664)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:303)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:175)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:181)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:85)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:279)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._invokeDoFilter(TrinidadFilterImpl.java:239)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:196)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:139)
     at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at edu.wisc.csa.web.ApplicationSessionExpiryFilter.doFilter(ApplicationSessionExpiryFilter.java:66)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at edu.wisc.csa.web.ResponseHeaderFilter.doFilter(ResponseHeaderFilter.java:36)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at oracle.security.jps.wls.JpsWlsFilter$1.run(JpsWlsFilter.java:85)
     at java.security.AccessController.doPrivileged(Native Method)
     at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:257)
     at oracle.security.jps.wls.JpsWlsSubjectResolver.runJaasMode(JpsWlsSubjectResolver.java:250)
     at oracle.security.jps.wls.JpsWlsFilter.doFilter(JpsWlsFilter.java:100)
     at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:65)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3496)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
     at weblogic.security.service.SecurityManager.runAs(Unknown Source)
     at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2180)
     at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2086)
     at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1406)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)

Answer 1

OK I have tried Frank's suggestion about the 2 entries in the managed bean and it works but I cannot collapse my child node !
I have a Master-Detail-Detail setup.
In the Grandparent I have this :
RowKeySet rks = new RowKeySet(true);
table1.setDisclosureState(rks);
this.grandParentTable = table1;
and in my Parent table I have this :
RowKeySet rks = new RowKeySet(true);
table2.setDisclosureState(rks);
this.parentTable = table2;
ie the same.
In my child I have nothing just the default accessors.
The collapse works OK for the Grandparent but when I click Hide for the Parent it does not do anything - no error message either.
cheers