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From Peter Jones <peter.jo...@sun.com>
Subject Re: [jira] Resolved: (RIVER-9) PreferredClassLoader should try to avoid making a direct check against the first URL
Date Fri, 02 May 2008 03:46:47 GMT
On Thu, May 01, 2008 at 05:28:45PM -0400, Bob Scheifler wrote:
> Peter Jones wrote:
>> The other option that I can think of is that PreferredClassLoader was
>> trying to be careful to only consider 4xx HTTP responses to indicate
>> that the JAR file definitely does not exist, not 5xx HTTP responses,
>> which are logically less definitive, but still cause
>> FileNotFoundException.

Oops, I had gotten confused by looking at too many (old) JDK versions
yesterday-- the above (FNFE thrown for any response code 400 or above)
was true through 1.3.1, but since 1.4 and the fix for 4160499, a FNFE
is thrown only if the response code is 404 or 410, otherwise a generic
IOException is thrown, consistent with what Bob says below.

>> This seems like a plausibile explanation, but it doesn't ring a
>> bell with me (Bob?).
> The only difference I can find is that PreferredClassLoader treats
> 403 (FORBIDDEN) as definitely does not exist, whereas HttpURLConnection
> throws an IOException for it.  Doesn't seem like we would have really
> gone to that much trouble for that one case, though.


-- Peter

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