Unserializable UIGraph when passing as Contextual event attributes

Hi,
I am passing UIGraph variable along with the event attributes. It is working properly but on console logs i am seeing warning of Unserializable key. Will it be a recommended approach for passing UIGraph along with contextual event?
Thanks-
Mangal

Hi,
note that I doubt that passing #{bindings} as a custom payload is a good idea as it poses some risk
1. the binding container is changed with each request so that there is no guarantee the content is available
2. returning object referenced from the inner to the outer breaks encapsulation
So if there is an information in the bindings that you need to pass on to the unbounded task flow, then specify the value and return it. I hope that you don't use the binding payload to execute operations, creating new rows or updating data therein. Payloads are only for information purposes.
From your problem description, how likely is it that the wrong event is fired? Given that the event adds the custom payload it is more than unlikely that the payload is not getting replaced. So there must be something either with the invocation of the event or the DC holding the payload.
You don't give us the JDeveloper version you run, so no chance to judge based on this information.
Frank

Similar Messages

Building Contextual Events with multiple parameters

I am working in JDeveloper 11.1.1.4 and trying to build a contextual event, but ran into a issue that I find unclear. When building the Subscribers on my page definition, in the Property Inspector, how do I define multiple parameters in the customPayLoad element? In all the examples I've found, they reference putting ${payLoad} as the value and they only show one parameter. I need each value to be unique for each parameter. How do I accomplish this?

for this you can use attributes
say suppose if you are using table then you can pass values from producer like
            Map attributes = table.getAttributes();
            attributes.put("param1", param1);
            attributes.put("param2", param2);
            attributes.put("param3", param3);
            attributes.put("param4", param4);and consume it like
    public void handleBusinessChkListEvent(Object payload) {
        SelectionEvent selectionEvent = (SelectionEvent)payload;
        UIComponent component = (UIComponent)selectionEvent.getSource();
        String param1=
            (String)component.getAttributes().get("param1");
        String param2= (String)component.getAttributes().get("param2");
        Boolean param3=
            (Boolean)component.getAttributes().get("param3");
        String param4=
            (String)component.getAttributes().get("param4");
}

How to publish contextual event from dynamic region

Hi Experts, plz help.
Scenario :
I have a page , say Page A.
I have two bounded task flows, say HeaderTF and LinesTF.
HeaderTF is placed as a static Region in page A and LinesTF is a dynamic region in page A.
LinesTF has a table with Amount Column.
HeaderTF has a text field which shows the total of amount column.
Requirement :
when user adds new rows or changes existing rows or deletes any rows in LinesTF, total field in HeaderTF should be updated.
On change of amount value in lines, I am calculating and updating the total attribute of header VO as all of them are sharing same DC.
but the value is not reflecting becos partial triggers cannot be kept for total field.
So I am using contextual events.
I created a contextual events for amount field, delete button and table as well (In LinesTF).
and I created handler method in AM which calculates total and dragged it as a text field in HeaderTF.
Now when I am trying to subscribe from pagedef of pageA, i am able to find the handler which is created in HeaderTF but could not find any contextual events in event lov.
Question :
1. Is my approach correct?
2. Cant we publish contextual events from dynamic regions?
3. Is there any alternate way of achieving this?
I did not try refreshing HeaderTF by passing input params because I dont want the entire region to be refreshed.

Try creating the event mapping - please see "28.7.2 How to Create Contextual Events Manually" in Dev Guide http://download.oracle.com/docs/cd/E15523_01/web.1111/b31974/web_adv.htm#CACJBFGI

Contextual event in reverse direction ( from child TF to parent view )

Hi ,
It seems all example of Contextual events talk about mirroring input value from Parent page to Child TF running in a region and there are numerous examples out there.
What I wanted to accomplish was that an lov in a child TF triggers a contextual event and the parent TF takes the selected list of values. It needs to conduct a search based on these values and than mark the rows in a (tree)table.
What has succeeded is almost all aspects of this. I can fire the event and receive it successfully. But the problem is the the backingBean class that I create via EL is not binded to my parent pages components. The treetable component returns null.
My handler code (the handler code from the bean which you use to create the data control to listen to the cntxtual event) is almost 1:1 to as the code from the book "Oracle Fusion Developer Guide: Building Rich Internet Applications with Oracle ADF Business Components and Oracle ADF Faces", Chapter 6, page 210.
public void receiveEvent(
DCBindingContainerValueChangeEvent incomingPayload){
FacesContext fctx = FacesContext.getCurrentInstance();
ELContext elctx = fctx.getELContext();
Application app = fctx.getApplication();
ExpressionFactory exprFactory = app.getExpressionFactory();
ValueExpression valExpr = exprFactory.createValueExpression(
elctx,
//reference the managed bean that holds the mirror value
//property displayed in the input text field
"#{backingBeanScope.ConsumerBackingBean}",
Object.class);
ConsumerBackingBean consumer = null;
consumer = (ConsumerBackingBean)valExpr.getValue(elctx);
//get the changed attribute value from the contextual event
//payload
String newValue = (String)incomingPayload.getNewValue();
//set the new value to the backing bean property that is
//referenced by the input text field in View 3
consumer.setMirrorValue(newValue);
AdfFacesContext adffacesContext = null;
adffacesContext = AdfFacesContext.getCurrentInstance();
//partially update the text field to display the new value
adffacesContext.addPartialTarget(consumer.getMirrorTxt());
The #{backingBeanScope.ConsumerBackingBean} evaluates in my case to fine. But every component I should see as binding in the bean is null.
Since the handler is declared in the pageDef of this parent page Fragment, i assumed the last bit about it being able to get to the backing bean and hence to my components should also be possible.
If I cant refresh my components than I dont see the use of the contextual frameworks for me.

You should find this post useful: http://flexponential.com/2010/12/05/saving-scroll-position-between-views-in-a-mobile-flex- application/
It demonstrates one way of saving and restoring data when pushing and popping a view.

Contextual event on table not triggered

Using Jdev PS4.
Concider following example: http://www.yonaweb.be/ContextualEvent.zip
(I know following example can be simplified by using master-detail relation in the data control but it's to illustrate the example)
I have two taskflows: EmployeeTF and departmentTf.
The idea is to trigger an event when I select a new record in the department table.
This is the tree binding:
<tree IterBinding="DepartmentsIterator" id="Departments">
      <nodeDefinition DefName="model.views.DepartmentsView" Name="Departments0">
        <AttrNames>
          <Item Value="DepartmentId"/>
          <Item Value="DepartmentName"/>
          <Item Value="ManagerId"/>
          <Item Value="LocationId"/>
        </AttrNames>
        <events xmlns="http://xmlns.oracle.com/adfm/contextualEvent">
          <event name="changeTheDept"
                 customPayLoad="${bindings.DepartmentId.inputValue}"
                 eventType="Currency Change Event"/>
        </events>
      </nodeDefinition>
    </tree> I have created a custom java class to use as a data control to find out when the event is triggered. This is my code:
    public void handleEvent(Object payload){
        System.out.println("Event handler");
        System.out.println(payload);
    }When I select a record in the table, the event does not get fired.
So as a test I added my own custom method to see if contextual events are working properly so I added this method to my DC:
    public void triggerEvent(){
        System.out.println("triggering event");
    }and added it on a commandLink to the DepartmentTF. I also added an event on it:
<methodAction id="triggerEvent" RequiresUpdateModel="true"
                  Action="invokeMethod" MethodName="triggerEvent"
                  IsViewObjectMethod="false" DataControl="EmpBean"
                  InstanceName="EmpBean.dataProvider">
      <events xmlns="http://xmlns.oracle.com/adfm/contextualEvent">
        <event name="triggerEvent"
               customPayLoad="#{bindings.DepartmentId.inputValue}"/>
      </events>
    </methodAction>When I trigger this event, my event handler does get called on the employee taskflow.
So, my question is:
1) Is this normal behavior that the change row event is not triggered?
2) if yes, how do I trigger it or what is the purpose of this event?
Edited by: Yannick Ongena on May 28, 2012 9:03 PM

I have a similar circumstance: I have a page with two regions, each region contains a table. The two tables share some information so when I update one of them
I also want the change to be reflected in the other table. I tried to use contextual events to send an event that causes one of the tables to refresh (I do not pass any payload)
but so far I have not had any success with making this work. I am wondering if the bug you mentioned here would also prevent such a setup to work? I am using Jdev 11g R1 11.1.1.6.2.

Contextual event - handler called before producer bean's setter

I am trying a simple contextual events usecase:
Page A.jsff has an input text field whose value is directly stored in a bean variable (bean is in pageFlowScope). Contextual event is defined on value change event for this input field. A.jsff has taskflow B_btf as an embedded region.This B_btf will simply display the value entered in the A.jsff. So, when contextual event is raised, the handler sets the value in a local variable of B_btf bean. The problem is that the handler method is getting called before the setter for the attribute of the bean of A.jsff. This is resulting in the B_btf displaying the last-but-one value entered in the input field of A.jsff instead of the current/latest value. Any tips?
Thanks,
Amitabh

The issue was with the (lack of) understanding of the JSF lifecycle. The value change listener is called during the Process Validation phase, whereas the managed bean (Model) values will be set in the Update Model phase which lies next-in-line after Process Validation phase. Hence, if the value change listener is to be used, then the handler code should have used the default payload and not the custom payload. For a value change event the default payLoad will be a DCBindingContainerValueChangeEvent, and one can invoke getNewValue() to get the value entered in the text field (For details watch Frank Nimphius' video here: ADF Region Interaction - Contextual Events - YouTube). For my case, I added a command button to the page, and moved the contextual event to that button.

Contextual Events between templates and fragments

Hi there,
I'm having some issues to use contextual events in the following scenario:
I have an inputText and a button on a jsf template. The input text is associated with an attribute on a managed bean and the button triggers and action that returns the value of this property on the managed bean. Besides, it triggers a contextual event.
I also have a fragment that should consume that event, and this fragment is placed on a jsf that inherits the template that triggers the event.
Unfortunately, when I try to consume the event on my fragment I cannot see the producer on the event map window, and event if I create my event map manually, it doesn't work anyway.
Does anybody have an example of it?
Am I doing smth wrong here?
Cheers,
George

Hi,
does the template ave a pagedef file that exposes the binding that triggers the communication ?
Frank

How to create contextual event with custom payload?

I use the following code to invoke contextual event from my region via the "action-listener" of a command-link:
<af:commandLink text="#{row[def.name]}" id="cl1"
styleClass="tableLinkActive"
actionListener="#{backingBeanScope.PanelToConveroFormManager.handleSelectedRow}">
The following "action-listener" is designed to pass the current selected record key to the "consumer" of the contextual event:
public void handleSelectedRow(ActionEvent actionEvent) {
String currentRecordKey = getCurrentRecordKey();
JUEventBinding eventBinding = (JUEventBinding)BeanUtils.getBindings().get("RefreshParentEvent");
if (eventBinding != null) {
ActionListener actionListener = (ActionListener)eventBinding.getListener();
actionListener.processAction(actionEvent);
How do I pass the "currentRecordKey" value as a custom "payload" via the event-binding "RefreshParentEvent" in the above code?
Is there any code example on using contextual event with custom payload?

Hi,
the custom payload is referenced when you set up the event itself. You use EL in the custom payload definition to point to a managed bean method that when called accesses the current rowKey. The Java code you show just passes the ActionEvent of the ADF Faces command button and invokes the event. It does not manipulate the event definition.
<eventBinding id="eventBinding"
                  Listener="javax.faces.event.ActionListener">
      <events xmlns="http://xmlns.oracle.com/adfm/contextualEvent">
        <event name="testEvent"
               customPayLoad="#{mymanagedBean.rowKey}"/>
      </events>
    </eventBinding>Frank

Capture Return Value from Contextual Events Subscriber Method

Hi
I was wondering if anyone knew whether you could capture the return value from a method exposed as a subscriber for a contextual event?
Requirement: We have 2 bounded task flows (parent-child) with the child task flow embedded as a region in a view activity in the parent task flow. Based on an action in the parent task flow we raise a contextual event which calls an application module method exposed as a data control within the child task flow. We need to be able to capture the return value from the method on the managed bean.
Example method within child task flow application module:
public String contextualEventSub(){
Return "Y";
So here we would like to capture String value when the event is raised by the event producer (parent task flow action).
Within the Event Map on the page definition of the parent task flow view activity it is possible to set parameters to pass to the subscriber but it’s not obvious where you can capture the return value.
Many thanks!
Technology:
ADF 11.1.1.7 – ADFbc with ADF task flows and page fragments

Check this URL it may help you
One size doesn't fit all: JDev 11g: Programmatic Contextual Events

Calling a method on backing bean in response to contextual event

Hi
I am using Jdeveloper 11.1.1.6.0 and using ADF contextual events..
I have a drop down list and i am rasiing a contextual event on changing the current selection. In response to that event i want to call a backing bean method with parameters.. But when i click on the subscriber section for the contextual event, i can see only some bindings of the page.. How can i call a method on backing bean as a subscriber..
Thanks
Raghu

Hi,
this article has a use case for the POJO approach: http://www.oracle.com/technetwork/issue-archive/2011/11-may/o31adf-352561.html
Another is to define a method binding in the receiving PageDef file and configure it as explained here
http://java.net/projects/smuenchadf/pages/ADFSamplesBindings/revisions/3#SMU164
Frank

Triggering Validation in a Region Through a Contextual Event

I am using JDeveloper 11.1.1.6.0.
I am trying to find out how to trigger the built in validation that occurs normally when a "submit" action occurs, but have the submit action occur outside of a region, and the validation also occur in the region itself.
I have a page that contains a dynamic region in it. I will refer to the containing page as the parent and the region as the child. The parent region and child region both have different business objects bound to them, though they are part of the same application module. The parent page contains a submit button that needs commit the user entered data in both the parent and child pages. This action must not proceed if there are any validation errors in the parent or the child. The validation should trigger on the parent page without any work from me because of how ADF handles the situation. The child page is notified of the submit action via contextual events. I currently have it where this event can trigger the "commit" action successfully, but I have no idea how to go about ensuring that it triggers a validation check as well.
The overall flow that I think will happen in the final version is likely:
1: submit button pressed.
2: parent page validation is checked (if success, proceed)
3: contextual event is fired
4: contextual event is received by the child.
5: the child triggers its own validation (if success, proceed, else stop)
6: the child triggers a commit action
7: the child sends a response contextual event (signalling that it was successful)
8: the parent receives the response contextual event
9: the parent performs a "commit" action.
I do not know how to cause step 5 to occur, and I do not know if steps 7 through 9 are needed yet (I haven't tested to see if causing the commit in either the parent or the child ends up causing all modified entity objects to be committed). Any help would be greatly appreciated.
Thank you

Hi,
you can access a command button on the page fragment and queue its action event. For this you access a managed bean (backingBean Scope) that contains a handler to the command button and queue the event (this then will perform validation as if the user clicked it. The command button can also be hidden on the fragment.
Have a look here for how you can integrate the managed bean as the contextual event handler
http://www.oracle.com/technetwork/developer-tools/adf/learnmore/regionpayloadcallbackpattern-1865094.pdf
Frank

Dynamic TaskFlow Gets Refreshed on Catching a Contextual Event

Hi,
I am using Contextual events in my application. I have 2 task flows in my parent page. One TF is raising an event and the other is catching it. As my catching TF is a dynamic TF, I have specified the event map in it only.
Everything is working as intended only that my dynamic TF gets refreshed when it catches the event! I do not want that. I want to explicitly refresh any UI component that requires to be refreshed, not the whole TF.
So is there any specific property of task flows that make it to refresh itself when ever it catches any contextual event?
Also I have tried 'Refresh="ifNeeded"' and 'RefreshCondition="#{false}"' in my dynamic taskflow specification in the parent page but it does not make any difference.
Regards,
Rahul Saxena

Rahul,
there is no setting for this. If however the managed bean you setup for handling the dynamic region is in backing bean scope (or request scope) then chances are that the region is refreshed because the bean restes after the request (just assuming here). Yournot giving us much to chew on (no JDeveloper version, no implementation details etc. ) So its hard to provide further ideas. As a last resort, if you have a support contract, you can contact customer support with a test case
Frank

Communication through contextual events in ADF 11g?

hi everyone ,
I have a requirement that i have to establish a communication between two taskflows and communication between page and the two taskflows at a time through contextual events
I'm able to establish a communication between two taskflow regions but when it comes to establish a communication between a page and two taskflows at a time the two taskflows are rendering but the region in page s not
(when i click deptno in taskflow region ,the employee table is displayed according to the deptno in another taskflow and the region contains output text is not at all rendering according to the deptno)
plz do this needful
thanx in advance

Hi,
contextual events are between active PageDef files. This means that if a task flows is not displayed on a view, then it is not included in contextual event communication.
Frank

Contextual Event on row selection in the table

Hi,
My taskflow has just a view activity which queries a view object and displays results as a table. This taskflow is inserted in the main page as a region. I have set up a selection listener on the table, to map to a method in a managed bean. I have made this method binding a producer of my contextual event. and another method binding on the main page as a consumer. I have mapped producer and the consumer on a event map on the main page.
My problem is when a row is selected in the table, I see the method (in the selection listener) is called but the event is not fired and the consumer method is not called. I don't know, if it is because the producer method (selection listener) takes SelectionEvent as a parameter?.
I added just to test, a button on my view activity and mapped the action listener to another method(with out parameters) on the same managed bean and made this a producer. In this situation the event got fired and the consumer method got called.
Why is the selection listener method not firing the event?
Thanks in advance.

Hi,
the two events that are supported for ADF Faces component events are ActionEvent and ValueChangeEvent. So if you have a selection event, you need to take this infromation and create an ActionEvent from it.
http://java.sun.com/javaee/javaserverfaces/1.2/docs/api/javax/faces/event/ActionEvent.html
Frank

Contextual Event Automatically refreshing child regions

Hello,
Here's my dilemma. We have an ADF page fragment that contains three regions(which point to 3 different bounded task flows). Lets call the bounded taskflows btf1, btf2, and btf3.
What currently happens is we use contextual events to create communication between (btf1 and btf2) and communication between (btf2 and btf3)? We do not have contextual event that would allow communication between btf1 and btf3.
So we currently have this communication working. Hence, when I hit a button in btf1, it fires off a contextual event, such that btf2 is refreshed. But what is happening here, is that btf3 is also being refreshed. We DON'T want THIS... We only want btf3 to be refreshed from an event that is fired from btf2.
Question. Is there a way to restrict ADF from refreshing btf3 everytime and event is fired from btf1.
In general, it seems as though all regions are being refreshed everytime a contextual event is fired. We don't want this. How can disable this from happening? We have checked all of wiring. There is no connection between btf1 and btf3.

Try creating the event mapping - please see "28.7.2 How to Create Contextual Events Manually" in Dev Guide http://download.oracle.com/docs/cd/E15523_01/web.1111/b31974/web_adv.htm#CACJBFGI

Unserializable UIGraph when passing as Contextual event attributes

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