Reacting to af:query search event

Question

I need to disable/enable page elements based on the execution of an af:query control in a page.
I tried calling a method in managed bean that accepts a QueryOperationEvent parameter. I get a NullPointerException in:
oracle.adf.model.binding.DCIteratorBinding.getApplicationModule
before the page even renders if I set the QueryOperationListener property for the control. I am using the binding editor in JDeveloper to set this property so I assume the property value it generates is syntactically correct: #{SalesentityMenuHandler.handleQueryEvent}
SalesentityMenuHandler is a managed bean that I am referencing successfully elsewhere in my code.
Any ideas why this doesn't work?
Any suggestions on another approach for doing what I need to do? (call a method somewhere when the search button is hit).
Dave

Answer 1

In case this comes up for anybody else, here is what I ended up doing:
- I set the QueryListener propery of my Quick Query to a method in a managed bean
- in the method in the managed bean, I did what I needed to do to the page components and then invoked the processQuery binding using this:
JSFUtils.invokeMethodExpression("#{bindings.ImplicitViewCriteriaQuery.processQuery}", Object.class, queryEvent.getClass(), queryEvent);
- invokeMethodExpression is a method in my JSFUtils class that I 'borrowed' from Frank Nimphius/Steve Muench:
   public static Object invokeMethodExpression(String expr, Class returnType, Class[] argTypes,Object[] args){
           FacesContext fc = FacesContext.getCurrentInstance();      
           ELContext elctx  = fc.getELContext();
           ExpressionFactory elFactory = fc.getApplication().getExpressionFactory();      
           MethodExpression methodExpr = elFactory.createMethodExpression(elctx,expr,returnType,argTypes);      
           return methodExpr.invoke(elctx,args);      
   public static Object invokeMethodExpression(String expr, Class returnType,Class argType, Object argument){    
       return invokeMethodExpression(expr, returnType,new Class[]{argType}, new Object[]{argument});
   }Thanks Frank and Steve for coming up with this stuff and sharing it with us!
Dave