RFR: 8359808: JavaRuntimeURLConnection should only connect to non-directory resources [v3]

[David Beaumont]

On Sat, 21 Jun 2025 08:50:15 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> src/java.base/share/classes/sun/net/www/protocol/jrt/JavaRuntimeURLConnection.java line 133:
>> 
>>> 131:             return ParseUtil.decode(path);
>>> 132:         } catch (IllegalArgumentException e) {
>>> 133:             throw new MalformedURLException(e.getMessage());
>> 
>> The old code treated this as fatal, throwing InternalError.
>
> MalformedURLException seems better here.

Yes, but is that good though? This is a public API and surely as a random user I shouldn't be able to trigger an `Error` just by having bad input data?
Since we can reasonably reason that, to a first approximation, "this code path isn't being hit by anyone" it felt reasonable to reflect "bad input data" with a MalformedURLException.
Shall I change it back?

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PR Review Comment: https://git.openjdk.org/jdk/pull/25871#discussion_r2161328242