JSP, View Object and ? parameter

Question

I have a view object that uses a ? type parameter in its query. The use ? type parameter checkbox has been marked in the view and the view compiles successfully.
Now this view is being used by the Data Web bean JS Tree Browser in a JSP page.
The JSP code
<jsp:useBean class="oracle.jbo.html.databeans.JSTreeBrowser" id="roleMenuTree" scope="request" >
<%
roleMenuTree.setDepthLevel(6);
roleMenuTree.setReleaseApplicationResources(false);
roleMenuTree.setDisplayAttributes("Name");
roleMenuTree.initialize(pageContext,"Tasksys_TasksysAppModule.MenuTreeView");
Object x[] = new Object[1];
x[0] = "tasksys";
roleMenuTree.getRowSet().getViewObject().setWhereClauseParams(x);
roleMenuTree.getRowSet().getViewObject().executeQuery();
roleMenuTree.render();
%>
</jsp:useBean>
But I end up getting the following error. WHY ?
Error: 500
Location: /tasksys/jsp/login_submit.jsp
Internal Servlet Error:
javax.servlet.ServletException: JBO-27122: SQL error during statement preparation. Statement: SELECT Menus.ID, Menus.NAME, Menus.DESCRIPTION, Menus.MODULE, Menus.MEN_ID FROM MENUS Menus WHERE menu_allowed(?, to_char(id)) = 'Yes'
void org.apache.jasper.servlet.JspServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
void org.apache.tomcat.core.ServletWrapper.doService(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.Handler.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ServletWrapper.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ContextManager.internalService(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.core.ContextManager.service(org.apache.tomcat.core.Request, org.apache.tomcat.core.Response)
void org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(org.apache.tomcat.service.TcpConnection, java.lang.Object[])
void org.apache.tomcat.service.TcpWorkerThread.runIt(java.lang.Object[])
void org.apache.tomcat.util.ThreadPool$ControlRunnable.run()
void java.lang.Thread.run()
null

Answer 1

You need to prepare the query using the setWhereClauseParams(x) call, before you initialize your data web bean. Otherwise, if you call the methods after you initialize your web bean, the context has already been set and the error occurs.
You should insert another data web bean into your page somewhere at the top and use it to setup your query and create a view object. You should remove this bean's Render() method since you are only interested in the Initialize() method here. Add your code to prepare the query and create the view object.
Then when your JS Tree Browser executes, it will be able to call getRowSet() on the View Object you created already.