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Doubt in a Mock Exam Question...

 
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Which of the following is a sensible way of sending an error page to the client in case of a business exception that extends from java.lang.Exception?

Select 2 correct options.

1)Catch the exception and use RequestDispatcher to forward the request to the error page.
2)Don't catch the exception and define the 'exception to error-page' mapping in web.xml
3)Catch the exception, wrap it into ServletException and define the 'business exception to error-page' mapping in web.xml
4)Catch the exception, wrap it into ServletException, and define the 'ServletException to error-page' mapping in web.xml
5)Don't do anything, the servlet container will automatically send a default error page.

The given answers are 1 & 3.
I can't understand why answer 4 is wrong? can anyone explain a bit on this?
 
Greenhorn
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Hi Saran!

In (3) you can choose to have different error page to forward to for different types of business exceptions.

But in (4) for any type of business exception you will be able to forward only to the error page specified in mapping against ServletException.If this is what you want then (4) is also correct. But generally you would want to forward to error page depending on the type of business exception.
 
saran ram
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ooook...I got it. Thank you Nilesh.
 
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