Strange problem with with setValue for valueBinding

Question

I have implemented Steve Muench example 72 from Not jet documented examples (Search Page with 'Sticky' Criteria Value Across Pages Using View Object Named Bind Variable)
This is two page application with searchForm in one and result table is second. Search parameters are saved in processScoope after search button is pressed like this:
<af:setActionListener from="#{bindings.EmpName.inputValue}"
to="#{processScope.EmpName}"/>
Theres a class that extends PagePhaseListener and
after the ADF page lifecycle's prepareRender phase, invokes a
custom onPagePreRender() method
public void afterPhase(PagePhaseEvent event) {
FacesPageLifecycleContext ctx = (FacesPageLifecycleContext)event.getLifecycleContext();
if (event.getPhaseId() == Lifecycle.PREPARE_RENDER_ID) {
bc = ctx.getBindingContainer();
onPagePreRender();
bc = null;
onPagePreRender() sets values in valueBinding for search parameters from processScope variables like this:
public void onPagePreRender() {
String expr = "#{bindings.EmpName.inputValue}";
String value = "#{processScope.EmpName}";
FacesContext fc = FacesContext.getCurrentInstance();
ValueBinding vb = fc.getApplication().createValueBinding(value);
String valToSet = (String)vb.getValue(fc);
ValueBinding vb1 = fc.getApplication().createValueBinding(expr);
vb1.setValue(fc, valToSet);
System.out.println("vb.getValue(fc): " + vb1.getValue(fc));
In Steve's example after search is pressed, we are navigated to resultPage.
The problem is when:
I remove direct navigation after search is pressed and create the second button for navigation action. Then if I go to other page and then back-
vb1.setValue(fc, valToSet) doesnt set value to valueBinding. getValue returns null, but valToSet is not null.
It happens just when I do this first time, after navigating to other page again, the value is set just fine.
The strangest thing is that the problem is gone if I repeat setValue twice:
vb1.setValue(fc, valToSet);
vb1.setValue(fc, valToSet)
Is it a bug or am I missing something here?

Answer 1

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