Qeustions about log on issues

Now we get a problem about log on for our bc4j+uixml application. In priciple before viewing our website the viewer should sign in. we use dynamic credentials as introduced under this link: http://otn.oracle.com/products/jdev/howtos/bc4j/howto_dynamic_jdbc.html because the user/password pairs are stored in oracle database.
What a problem we have?
Before viewing every page Login.uix will be displayed for Log on.By testing if we sign in with right username/password it works and the desired paged will then be displayed.But with false username/password We hope the Login.uix would still be displayed untill log on succeeded. but nothing is displayed.
What we have done ?
1.registered oracle.cabo.servlet.loginPage and oracle.cabo.servlet.loggedInKey in web.xml.
2.We use the two java files introduced in the article above ,and of course we have replace the page LoginForm.jsp with our own Login.uix . And a eventhandler is assigned for the submit button in Login.uix
Where is the right place to handle the exception if log on failed? in that eventhandler or somewhere else? I hope some people here have also handled such a problem and can give me some suggestion.
thanks a lot!
yong

Hi Yong,
Getting this behavior should be no problem. What do you return as your EventResult in the case of an invalid login?

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