How can my custom DCErrorHandler class throw/handle an exception?

I had written a custom DCErrorHandler extending the DCErrorhandlerImpl as similar as shown in SRDemo example.
Assume that i have a method authenticateUser() in AppmoduleService Class calling from Backing Bean.java where in i encountered ArrayOutOfBoundsException. So how can i catch this exception without using try catch block? if i use
try{
authenticateUser();
catch(Exception eX)
{} the exception is well-handled.Then what exactly my customErrorHandler class doing?
Do the above customErrorHandler class help in this case by replacing try-catch?

From where my customErrorHandler's methods are invoked.
If i want to do it exlicitly from any method of my backing bean class can i do it?
LoginBackingBean.java
public String loginButton_Action()
ArrayList userDetailsList = null;
LoginService service = (LoginService)ADFUtils.getLoginServiceInterface();
if(service != null)
userDetailsList = service.checkUserLoginDetails(getUsername(), getPassword());
if(userDetailsList != null && userDetailsList.size()>0) {
JSFUtils.storeOnSession("key_loggedUserDetails",userDetailsList);
return "success";
else
JSFUtils.addFacesErrorMessage("You have entered an invalid User name and/or Password.");
return "wrongLogin";
else{
return "wrongLogin";
Now assume that i have customDCErrorHandler class and also assume that an exception will be thrown ..say ArrayOutOfBoundException.
if i keep the above code in try and catch block the user login screen is remained as it is by catching the exception.
if i remove the try and catch block user screen if filled up with so many debugging messages as shown : "500 Internal Server Error
javax.faces.FacesException: #{login.loginButton_Action}: javax.faces.el.EvaluationException: java.lang.IndexOutOfBoundsException: Index: 1, Size: 0 at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:98) at oracle.adf.view.faces.component.UIXCommand.broadcast(UIXCommand.java:211) at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:287) at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:401) at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:95) at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:245) at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:110) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:213)
So can we avoid this by using my customDCErrorHandler ???? If so i need a sample code.
More over if i use a customDCErrorHandler class,
Do i need to bother about the exceptions occuring in the application?

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