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response commitment

 
cyril vidal
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Dear all,
I would like to be sure. Manning book SCWCD Exam Study Kit, p.109
Question 2:

Answer to question is: Assuming that getNameFromDBSomeHow() returns null, it will throw an IllegalStateException while serving request because when sendError is called, response is supposed to be commited and nothing may be written to the response once it is commited.
Now, in errata page for this book, we can read for this question:
Remove the line:
out.flush()

That is because this instruction enforces response to be commited, right?
So an answer to a precedent thread about resposne commitment would be:
when you see out.flush(); as instruction, you may say that the response is commited and so that in any case, you may call response.sendRedirect().
Am I right for this point?
Thanks for your response,
Regards,
Cyril.
 
cyril vidal
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Sorry, you should of course read at the end of the posr
so that in any case, you may NOT call response.sendRedirect() or response.sendError().
 
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