Complex Query JSP page

Question

I have a JSP page where I want to display the results from a query with a parameter supplied by a form.
The problem is, my query does not have a where clause but instead is a hierarchical query e.g.
http://www.dbazine.com/mishra3.shtml
SELECT LEVEL, EMP_NAME , EMP_ID, MGR_ID
FROM EMPLOYEE
START WITH MGR_ID IS :1
CONNECT BY PRIOR EMP_ID = MGR_ID;
Where :1 is where I want to put in a parameter.
Can I do this using an ADF ViewObject and JSP page?
I am open to design suggestions here.
I have tried two naive ways of doing this which did not work.
1. Just try to set the parameters before opening the page using a DataActionMethod that opens the page on success
ViewObject vo = findViewObject("TrayTrackFwdHistory1");
vo.setWhereClauseParam(0, my_parameter);
vo.executeQuery();
In this case, somehow the page errors out before the set method is invoked with a ":1 is not set as an input or output parameter"
2. Simply drop and recreate the view object with the query parameter value inside it. e.g.
ViewObject vo = findViewObject("TrayTrackRevHistory1");
vo.remove();
vo = createViewObjectFromQueryStmt("TrayTrackRevHistory1", sqlStr);
vo.executeQuery();
In this case I get the error
Operation getCurrentRowSlot cannot be performed because the working set object is not bound. So somehow I have to reset the iterator binding for the JSP page I generated versus the above view?
Any help much appreciated.

Answer 1

So, I figured out the solution for this.
The answer here was to set the parameter value in the prepareModel event before the page is loaded. It turns out that setWhereClauseParam seems to set a parameter even if it is not part of a where clause so e.g.
protected void prepareModel(DataActionContext ctx) throws Exception {
String manager= ctx.getHttpServletRequest().getParameter("manager");
DCDataControl dc = ctx.getBindingContext().findDataControl("AppModuleDataControl");
AppModule am = (AppModule)dc.getDataProvider();
ViewObject vo = am.findViewObject("EmployeeManagers");
vo.setWhereClauseParam(0, manager);
vo.executeQuery();
super.prepareModel(ctx);
}