This was an interesting question so I tried it in a command line
program. The first problem that comes up is when you enter in a
character that's not going parse correctly, such as an alphabetic
character or an equals sign or a space. Or any combination of one or
more of those characters with valid integers. In this case, they will
get through the if statement, but cause a NumberFormatException on the
other side in the parseInt() method. You said the integers are valid,
but I would say some of them must not be.
Scott Stirling
On 16 Jan 2001 08:54:53 -0700, Derek Nerenberg wrote:
> Hello,
>
> I have some code that roughly resembles this, where the integers are valid integers.
> For some reason, I keep getting NumberFormatExceptions that I can't reproduce.
> I've done some printlns when I get the exceptions, and it's showing str1 and/or
> str2 as null. But, the guard clause should catch that. To make it more frustrating,
> these errors wind up killing the connector so my site is down completely. Restart
> JRun3.0 and everything is good until next time. Has anyone run into anything
>similar
> or have any ideas? NT4, IIS4...
>
> doGet(...)
> {
> String str1 = req.getParameter( "str1" );
> String str2 = req.getParameter( "str2" );
>
> try
> {
> if( str1 == null || str2 == null || "".equals( str1 ) || "".equals(
>str2 ))
> {
> res.sendRedirect( "/directory/default.htm" );
> return;
> }
>
> int num1 = Integer.parseInt( str1 );
> int num2 = Integer.parseInt( str2 );
> }
> catch( IOException ioe )
> {
> ...
> }
> catch( NumberFormatException nfe )
> {
> ...
> }
> }
>
> Kindest Regards,
>
> Derek Nerenberg
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