The puzzle of out.flush() and IllegalStateException

[Wei Geng]

There was a puzzle about the IllegalStateException with the out.flush().

public void doGet(...) throws IOException, ServletException {
...
                out.println("Hello");
[B]out.flush();[/B]
 
throw new IllegalStateException();
...
}

The result is that the page display "Hello" but not an error-page.
Even though I am sure that IllegalStateException was threw out, the error-page did not appear.

What did lead to the different results with the existence of the "out.flush()"?
Who can give me an explanation about this puzzle?
Thanks very much.

[ July 20, 2006: Message edited by: Wei GENG ]

[ July 20, 2006: Message edited by: Wei GENG ]
[ July 20, 2006: Message edited by: Wei GENG ]

[Ben Souther]

It's already sent the response to the browser.

put:

e.printStackTrace();

in the catch block and you will see the exception in the logs.

[Wei Geng]

e.printStackTrace();

in the catch block and you will see the exception in the logs.[/qb]<hr></blockquote>

As you said, I did catch the IllegalStateException with the try-catch block.
But when I removed the try-catch block, the error-page were not be displayed either.

What is the mechanism about the out.flush() and IllegalStateException?
May I suppose that once the response was committed to the browser, it will be ignored whether the Exception was threw out, and error-page would never appear?
[ July 20, 2006: Message edited by: Wei GENG ]

[ankur rathi]

Originally posted by Wei GENG:
There was a puzzle about the IllegalStateException with the out.flush().

public void doGet(...) throws IOException, ServletException {
...
                out.println("Hello");
[B]out.flush();[/B]
 
throw new IllegalStateException();
...
}

The result is that the page display "Hello" but not an error-page.
Even though I am sure that IllegalStateException was threw out, the error-page did not appear.

What did lead to the different results with the existence of the "out.flush()"?
Who can give me an explanation about this puzzle?
Thanks very much.

[ July 20, 2006: Message edited by: Wei GENG ]

[ July 20, 2006: Message edited by: Wei GENG ]

[ July 20, 2006: Message edited by: Wei GENG ]

Exception do come but at the BE (Back End), and response is already commited/sent to the user so...