Re: do loop bug?

From:

"Mike Schilling" <mscottschilling@hotmail.com>

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 10 Aug 2006 08:12:21 GMT

Message-ID:

<FTBCg.5511$9T3.1281@newssvr25.news.prodigy.net>

"emrefan" <dksleung@hotmail.com> wrote in message
news:1155196207.678236.52080@b28g2000cwb.googlegroups.com...

Well, I used such a strange construct in the real thing because I
wanted to retry some servlet accessing operation if a
java.net.ConnectException happened. And indeed this exception happened
quite often for a particular customer who was running the relevant
applet. It did not happen each and every time for this customer and
other customers were not suffering the same problem - at least not
frequently enough for them to raise an issue with us.

You explanation is perfectly clear to me. But the "continue to the
while expression" bit trapped me up.

If you're loooking for a construct that says "retry if an exception
happened", here's a thought:

    boolean done = false;
    while (!done)
    {
        try
        {
            ...
           done = true;
        }
        catch (Exception ex)
        {
            ...
        }
    }

This will exit the loop only if the code in the try block throws no
exceptions. Of course, you can tinker with it to limit the number of
retries, say

    boolean done = false;
    int retryCount = 0;
    while (!done && retryCount < 3)
    {
        try
        {
            ...
           done = true;
        }
        catch (Exception ex)
        {
            ...
            retryCount++;
        }
    }