the instant you execute code where a variable is NULL you will throw
NullPointerException
if you want robust code you are better off wrapping in try catch block as in
try
{
if( in == null) System.out.println("This statement will never be executed as
NullPointerException will be thrown");
}
catch(NullPointerException npe)
{
System.out.println("variable in has thrown NullPointerException so something
about that here");
}
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----- Original Message -----
From: "Christopher Schultz" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Monday, November 13, 2006 2:57 PM
Subject: Re: How do I ........?
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Steve,
>
> Steve R Burrus wrote:
>> hi chris this is steve Burrus and the line of code in question is the
>> while loop : "while( ( r = in.read(by)) != -1) {" the server error for a
>> long time has always pointed to that line of code creating the NPE.
>
> Yup, that's the first time you use the InputStream after attempting to
> load your file. It's pretty simple to check for null: just use the code
> I suggested in my last message:
>
>>> Correct me if I'm wrong, but this generally checks for null:
>>>
>>> if(null == in)
>>> // handle the null condition
>
> Now, it's up to you what you want to do in the event of a NULL image.
> You could either return a "404 Not Found" error status, or return a
> known good image that actually says "ERROR" on it.
>
> - -chris
>
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