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IllegalStateException does not happen. Why not?  RSS feed

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According to HFSJ, I should get an IllegalStateException if I redirect or dispatch the request after writing to the response. But that is not happening.

In any servlet's doPost():

No exceptions occur. The sendRedirect statement is simply ignored.
If I remove the flush() line, then it gets redirect but still without the exception.

It is sorta covered in the JavaRanch Style Guide.
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