How to pass calculated value to Application Module method?

Question

I am a newbie to ADF. Ithink I am missing something very basic:
In JDeveloper 10.1.3.3 using ADF, I am trying to pass the session ID to a method in my App Mod, but the method receives a null value. I think I a getting the session ID too late in the process, but do not know where else to get it.
Here are the details:
I am passing 3 argument to a method called ProcessReport:
public String ProcessReport(Number reportNumber, Double caratWeight, String sessionID)
In my PageDef I have:
<p>
&lt;executables&gt;
&lt;variableIterator id="variables"&gt;
&lt;variable Type="oracle.jbo.domain.Number"
Name="ProcessReport_reportNumber" IsQueriable="false"/&gt;
&lt;variable Type="java.lang.Double" Name="ProcessReport_caratWeight"
IsQueriable="false"/&gt;
&lt;variable Type="java.lang.String" Name="ProcessReport_sessionID"
IsQueriable="false"/&gt;
&lt;/variableIterator&gt;
&lt;/executables&gt;
&lt;bindings&gt;
</p>
<p>
&lt;methodAction id="ProcessReport" MethodName="ProcessReport"
RequiresUpdateModel="true" Action="999"
IsViewObjectMethod="false" DataControl="RC2DataControl"
InstanceName="RC2DataControl.dataProvider"
ReturnName="RC2DataControl.methodResults.RC2DataControl_dataProvider_ProcessReport_result"&gt;
&lt;NamedData NDName="reportNumber" NDType="oracle.jbo.domain.Number"
NDValue="${bindings.ProcessReport_reportNumber}"/&gt;
&lt;NamedData NDName="caratWeight" NDType="java.lang.Double"
NDValue="${bindings.ProcessReport_caratWeight}"/&gt;
&lt;NamedData NDName="sessionID" NDType="java.lang.String"
NDValue="${bindings.ProcessReport_sessionID}"/&gt;
&lt;/methodAction&gt;
&lt;attributeValues id="reportNumber" IterBinding="variables"&gt;
&lt;AttrNames&gt;
&lt;Item Value="ProcessReport_reportNumber"/&gt;
&lt;/AttrNames&gt;
&lt;/attributeValues&gt;
&lt;attributeValues id="caratWeight" IterBinding="variables"&gt;
&lt;AttrNames&gt;
&lt;Item Value="ProcessReport_caratWeight"/&gt;
&lt;/AttrNames&gt;
&lt;/attributeValues&gt;
&lt;attributeValues id="sessionID" IterBinding="variables"&gt;
&lt;AttrNames&gt;
&lt;Item Value="ProcessReport_sessionID"/&gt;
&lt;/AttrNames&gt;
&lt;/attributeValues&gt;
&lt;/bindings&gt;
</p>
On my page I have added an outputText control called sessionID to hold the session ID.
In my command Button to submit the page I have and action to call a method in my backing bean:
The code is:
FacesContext ctx = FacesContext.getCurrentInstance();
ExternalContext ectx = ctx.getExternalContext();
HttpSession mySession = (HttpSession) ectx.getSession(false);
String theSessionID = mySession.getId();
sessionID.setValue(theSessoinID) // I hope it populates the outputText control and is added to the binding to be passed to the ProcessReport method
BindingContainer bindings = getBindings();
OperationBinding operationBinding = bindings.getOperationBinding("ProcessReport");
Object result = operationBinding.execute();
if (!operationBinding.getErrors().isEmpty()) {
return null;
String resultStr = (String) result;
return resultStr;
No luck! I think I should get the sesson ID earlier, when the page loads, but I do not know where to put the code.
Any suggestions would be appreciated.
John

Answer 1

Hi,
here's what I would do
1. Create a managed bean as follows
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpSession;
public class HTTPSessionAccessBean {
    public HTTPSessionAccessBean() {
    public void setHttpSessionId(String httpSessionId) {
    public String getHttpSessionId() {
        FacesContext ctx = FacesContext.getCurrentInstance();
        ExternalContext ectx = ctx.getExternalContext();
        HttpSession mySession = (HttpSession) ectx.getSession(false);
        String sessionId = mySession.getId();
        return sessionId;
}2. In the ApplicationModule Impl class create the following method and expose it as a clientInterface
    public void setSession(String sessionId){
       ((SessionImpl)this.getSession()).getEnvironment().put("http_session",sessionId);
    }3) In the pageDef File create a method binding as
<methodAction id="setSession"
                  InstanceName="AppModuleDataControl.dataProvider"
                  DataControl="AppModuleDataControl" MethodName="setSession"
                  RequiresUpdateModel="true" Action="999"
                  IsViewObjectMethod="false">
      <NamedData NDName="sessionId"
                 NDValue="${HttpSession.httpSessionId}"
                 NDType="java.lang.String"/>4) In the same pageDef file create an invokeAction
    <invokeAction id="setSessionInAM" Binds="setSession"
                  RefreshCondition="#{!adfFacesContext.postback}"/>The session ID is now accessible from the ApplicationModule as
        Hashtable env = ((SessionImpl)this.getSession()).getEnvironment();
        String sessonId =(String) env.get("session);
        }This maintains the separation of model/view layer
Frank