Questions regarding authentication used in SRDemo ADF Tutorial

Hello,
I am currently in the process of learning ADF with the help of SR Demo application from OTN.
I have a few questions regarding the authentication used in SRDemo ADF Tutorial.
1) Why do I need to specify the list of the all the users in the jazn-data.xml file with the name and credential attributes?
2) How I change the authentication mechanism to point to database tables.(If it's not using, correct me if I am wrong).
3) The prompt which I am getting for authentication is like OEM authentication. Can I change this to a normal authentication login page?
4) As an option I would like to pass the person who logged in to windows , should be able to log in to the application. How can I pass the username(which I have in a java string) to my application and get logged in?
Any help is highly appreciable.
Thanks

Read these two, should help
http://technology.amis.nl/blog/?p=1462
http://stegemanoracle.blogspot.com/2006/02/using-custom-login-module-with-jdev.html
But to be honest, I couldn't get it working.

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         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
         at java.lang.reflect.Method.invoke(Method.java:585)
         at oracle.adf.model.binding.DCInvokeMethod.invokeMethod(DCInvokeMethod.java:504)
         at oracle.adf.model.binding.DCDataControl.invokeMethod(DCDataControl.java:1796)
         at oracle.adf.model.generic.DCGenericDataControl.invokeMethod(DCGenericDataControl.java:248)
         at oracle.adf.model.binding.DCInvokeMethod.callMethod(DCInvokeMethod.java:216)
         at oracle.jbo.uicli.binding.JUCtrlActionBinding.doIt(JUCtrlActionBinding.java:1287)
         at oracle.adf.model.binding.DCDataControl.invokeOperation(DCDataControl.java:1802)
         at oracle.adf.model.generic.DCGenericDataControl.invokeOperation(DCGenericDataControl.java:266)
         at oracle.adf.model.adapter.AdapterDCService.invokeOperation(AdapterDCService.java:318)
         at oracle.jbo.uicli.binding.JUCtrlActionBinding.invoke(JUCtrlActionBinding.java:625)
         at oracle.jbo.uicli.binding.JUMethodIteratorDef$JUMethodIteratorBinding.invokeMethodAction(JUMethodIteratorDef.java:160)
         at oracle.jbo.uicli.binding.JUMethodIteratorDef$JUMethodIteratorBinding.initSourceRSI(JUMethodIteratorDef.java:542)
         at oracle.adf.model.binding.DCIteratorBinding.callInitSourceRSI(DCIteratorBinding.java:1420)
         at oracle.adf.model.binding.DCIteratorBinding.getRowSetIterator(DCIteratorBinding.java:1403)
         at oracle.adf.model.binding.DCIteratorBinding.setRangeSize(DCIteratorBinding.java:2641)
         at oracle.adf.model.binding.DCBindingContainer.internalRefreshControl(DCBindingContainer.java:2484)
         at oracle.adf.model.binding.DCBindingContainer.refresh(DCBindingContainer.java:2257)
         at oracle.adf.controller.v2.lifecycle.PageLifecycleImpl.prepareModel(PageLifecycleImpl.java:104)
         at oracle.adf.controller.v2.lifecycle.Lifecycle$8.execute(Lifecycle.java:210)
         at oracle.adf.controller.v2.lifecycle.Lifecycle.executePhase(Lifecycle.java:116)
         at oracle.adf.controller.faces.lifecycle.ADFPhaseListener.mav$executePhase(ADFPhaseListener.java)
         at oracle.adf.controller.faces.lifecycle.ADFPhaseListener$4.after(ADFPhaseListener.java:331)
         at oracle.adf.controller.faces.lifecycle.ADFPhaseListener.afterPhase(ADFPhaseListener.java:97)
         at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:211)
         at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
         at javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)
         at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:64)
         at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl._invokeDoFilter(AdfFacesFilterImpl.java:367)
         at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl._doFilterImpl(AdfFacesFilterImpl.java:336)
         at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl.doFilter(AdfFacesFilterImpl.java:196)
         at oracle.adf.view.faces.webapp.AdfFacesFilter.doFilter(AdfFacesFilter.java:87)
         at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:15)
         at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:332)
         at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:627)
         at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:376)
         at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:870)
         at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:451)
         at com.evermind.server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:218)
         at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:119)
         at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:112)
         at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
         at oracle.oc4j.network.ServerSocketAcceptHandler.procClientSocket(ServerSocketAcceptHandler.java:230)
         at oracle.oc4j.network.ServerSocketAcceptHandler.access$800(ServerSocketAcceptHandler.java:33)
         at oracle.oc4j.network.ServerSocketAcceptHandler$AcceptHandlerHorse.run(ServerSocketAcceptHandler.java:831)
         at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:298)
         at java.lang.Thread.run(Thread.java:595)
    Caused by: java.sql.SQLException: No suitable driver
         at java.sql.DriverManager.getConnection(DriverManager.java:545)
         at java.sql.DriverManager.getConnection(DriverManager.java:140)
         at oracle.toplink.sessions.DefaultConnector.connect(DefaultConnector.java:62)
         ... 77 more
    2006-08-09 12:52:09.270 ERROR J2EE EJB8006 [SecretariaServiciosEJB:public java.util.List com.saep.negocio.SecretariaServiciosEJBBean.findAllAlumno()] exception occurred during method invocation: javax.ejb.EJBException: Excepción [TOPLINK-4002] (Oracle TopLink - 10g Release 3 (10.1.3.0.0) (Build 060118)): oracle.toplink.exceptions.DatabaseException
    Excepción Interna: java.sql.SQLException: No suitable driverCódigo de Error: 0; nested exception is: Excepción [TOPLINK-4002] (Oracle TopLink - 10g Release 3 (10.1.3.0.0) (Build 060118)): oracle.toplink.exceptions.DatabaseException
    Excepción Interna: java.sql.SQLException: No suitable driverCódigo de Error: 0
    2006-08-09 12:52:10.770 WARNING rowIterator is null
    2006-08-09 12:52:10.770 WARNING rowIterator is null

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