Dvt:barGraph, ActiveDataModelDecorator etc...

(JDev 11.1.1.7)
Has anyone succeeded in getting this combination to work?
Just dropped (read only) ViewObject from data control as a dvt:barGraph on the task flow 's jsff fragment.
And the data is properly displayed in the form of bar graph.
I am _not using task flow call activity (ADS does not work in that case)
Then tried to use active data service, by extending ActiveDataModelDecorator
In the overriden getModel() method, I am succesfully obtainend DataModel (by evaluating original barGraph value property from the fragment's pageDef).
In the overriden getActiveDataModel() method, I am returning my custom BaseActiveDataModel instance, here is the code:
public class GraphActiveModelClass extends BaseActiveDataModel {
    public GraphActiveModelClass() {
        super();
    protected void startActiveData(Collection<Object> rowKeys,
                                   int startChangeCount) {
        System.err.println("startActiveData() call");
        _listenerCount.incrementAndGet();
    @Override
    protected void stopActiveData(Collection<Object> rowKeys) {
        System.err.println("stopActiveData() call");
        _listenerCount.decrementAndGet();
    @Override
    public int getCurrentChangeCount() {
        return changeCounter.get();
    public void graphDataChange() {
        changeCounter.incrementAndGet();
    public void notifyDataChange(ActiveDataUpdateEvent event) {
      fireActiveDataUpdate(event);
    private final AtomicInteger changeCounter = new AtomicInteger();
    private final AtomicInteger _listenerCount = new AtomicInteger(0);
So, I changed the value property for dvt:barGraph to point to ActiveDataModelDecorator instance (registered as a session bean).
And tried to run app.
But, I am stuck with:
java.lang.NullPointerException
    at oracle.adf.model.dvt.binding.common.CommonBinding.getStateKey(CommonBinding.java:114)
    at oracle.adf.model.dvt.binding.common.CommonBinding.getStateObject(CommonBinding.java:91)
    at oracle.adf.model.dvt.binding.common.CubicBinding.getProjection(CubicBinding.java:215)
    at oracle.adf.model.dvt.binding.common.CubicBinding.getProjection(CubicBinding.java:190)
    at oracle.adf.model.dvt.binding.transform.cube.CubeDataModel.getDataAccess(CubeDataModel.java:450)
    at oracle.adf.model.dvt.binding.transform.cube.CubeDataModel.getDataAccess(CubeDataModel.java:441)
    at oracle.adf.view.faces.bi.model.DataModel.getDataAccess(DataModel.java:405)
    at oracle.adf.view.faces.bi.model.ActiveDataModelDecorator.getDataAccess(ActiveDataModelDecorator.java:187)
    at oracle.adfinternal.view.faces.bi.renderkit.graph.GraphRendererUtils.updateCommonGraph(GraphRendererUtils.java:356)
    at oracle.adfinternal.view.faces.bi.renderkit.graph.RichGraphRenderer.updateImageView(RichGraphRenderer.java:361)
    at oracle.adfinternal.view.faces.bi.renderkit.imageView.RichImageViewRenderer.updateImageViewModelAndProperties(RichImageViewRenderer.java:581)
    at oracle.adfinternal.view.faces.bi.renderkit.imageView.RichImageViewRenderer.encodeAll(RichImageViewRenderer.java:486)
    at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1432)
    at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:358)
    at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:840)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:937)
    at oracle.adfinternal.view.faces.util.rich.InvokeOnComponentUtils$EncodeChildVisitCallback.visit(InvokeOnComponentUtils.java:142)
    at org.apache.myfaces.trinidadinternal.context.FullVisitContext.invokeVisitCallback(FullVisitContext.java:154)
    at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:401)
    at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:326)
    at oracle.adf.view.faces.bi.component.graph.UIGraph.visitTree(UIGraph.java:467)
    at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:469)
    at org.apache.myfaces.trinidad.component.UIXComponent.visitTree(UIXComponent.java:326)
Te first line in the stackTrace, where NPE occurs actually is following statement (from CommonBinding.java:)
sb.append(getBindingContainer().getBindingContext().getCurrentDataControlFrame());
(sb is the StringBufer, and is not null)
Any idea ?
Any working sample anywhere ?

Hi Shay, thanks for useful response. Here is getModel() method from my custom ActiveDataModelDecorator:
public DataModel getModel() {
if (graphData == null) {
FacesContext fc = FacesContext.getCurrentInstance();
Application app = fc.getApplication();
ExpressionFactory elFactory = app.getExpressionFactory();
ELContext el = fc.getELContext();
// This is EL to avoid typecasting to an Internal class.
ValueExpression ve = elFactory.createValueExpression(el,
"_original_graph_value_from_pageDef", Object.class);
// Now GET the collectionModel
graphData = (DataModel)ve.getValue(el);
return graphData;
Now, if I understand correctly, you suggest to avoid this way, and to build DataModel in another way, "by hand" ? I probably have a way to access ViewObject with data, but have no idea how to build DataModel instance from that data. Maybe you have one example how to do that ?
P.S. sorry for formatting, this editor crazes me :-(

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I found this thread while searching for a solution to a similar problem.
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Hi Abhishek,
For your questions, please check the listed items as below:
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http://blogs.msdn.com/b/visualstudioalm/archive/2006/01/12/511845.aspx
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Check this page
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We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
Click
HERE to participate the survey.

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In our project, we have a requirement where we will be displaying three graphs using bargraph (BAR_VERT_CLUST) tabular data property (which gets values from backend).
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If you are using tabulardata in managing your data then does it mean that you cannot use this tag?
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The javadoc tag reference does not mention anything about this.
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Use case:
How do you format date attribute in a locale sensitive manner when your graph is using custom list in the tabulardata tag property of your graph component.
Thanks

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