RFR: 8348986: Improve coverage of enhanced exception messages [v16]

[Alan Bateman]

On Fri, 30 May 2025 10:44:11 GMT, Michael McMahon <michaelm at openjdk.org> wrote:

>> Hi,
>> 
>> Enhanced exception messages are designed to hide sensitive information such as hostnames, IP 
>> addresses from exception message strings, unless the enhanced mode for the specific category 
>> has been explicitly enabled. Enhanced exceptions were first introduced in 8204233 in JDK 11 and 
>> updated in 8207846.
>> 
>> This PR aims to increase the coverage of enhanced exception messages in the networking code.
>> A limited number of exceptions are already hidden (restricted) by default. The new categories and 
>> exceptions in this PR will be restricted on an opt-in basis, ie. the default mode will be enhanced
>> (while preserving the existing behavior).
>> 
>> The mechanism is controlled by the security/system property "jdk.includeInExceptions" which takes as value
>> a comma separated list of category names, which identify groups of exceptions where the exception
>> message may be enhanced. Any category not listed is "restricted" which means that potentially
>> sensitive information (such as hostnames, IP addresses, user identities) are excluded from the message text.
>> 
>> The changes to the java.security conf file describe the exact changes in terms of the categories now
>> supported and any changes in behavior.
>> 
>> Thanks,
>> Michael
>
> Michael McMahon has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fixed problem with j.n.HostPortRange

src/java.base/share/classes/sun/net/www/protocol/jmod/Handler.java line 50:

> 48:         if (index == -1)
> 49:             throw new MalformedURLException(
> 50:                 formatMsg("no !/ found in url spec%s", filterJarName(s).prefixWith(": ")));

JMOD files can only be used at compile time and link time. So I think you can drop the changes jmod stream handler.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23929#discussion_r2115650070