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Cris,
On 3/7/17 10:27 AM, Berneburg, Cris J. - US wrote:
> [SNIP]
>
>>> chris S>>> getRealPath is a bad idea. <<<
>>>
>>> For my education's sake, would you please explain that?
>>> [SNIP]
>>
>> There is no guarantee it will return a non-null value. The
>> typical reason is if the app is running from a packed WAR. Using
>> it reduces the portability of your application.
>>
>> Mark
>
> Thanks for explaining that. Never occurred to me that running from
> a WAR would return null.
>
> I used getRealPath thinking it would *increase* portability, since
> yet-another-config-option would not need to be manually set (or
> verified) after every deployment or in a different environment.
> "Why did the such-and-so fail? Oh... I forgot to set the folder
> location - again." By using getRealPath the setting never, ever
> needs to be configured - it's automatic.
>
> But now I may need to rethink that.
>
> BTW, why doesn't getRealPath return the full path to the folder
> that the WAR file is in instead of null?
You mean for a call like getRealPath("/")?
Well, that would require a path to be returned to the "root" of the
application. Let's say that ROOT.war is in
/home/tomcat/webapps/ROOT.war and also index.html is in the "root" of
the WAR File.
If you used getRealPath("/index.html") it would, as described, return
null -- because there's no file path that could get you to that file.
If you used getRealPath("/") and then added "/index.html" to the end
of it, you'd expect to be able to read index.html from the resulting
path (/home/tomcat/webapps/index.html). Not only does that not work
(because the file isn't there), it's not even the right path. The
"right" path (if there even is one) would be something like
"/home/tomcat/webapps/ROOT.war/index.html".
So when the WAR is not unpacked, there really isn't any meaningful
return value from getRealPath, even for special-cases like "" or "/".
- -chris
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