RFR: 8302791: Add specific ClassLoader object to Proxy IllegalArgumentException message

[Mandy Chung]

On Wed, 22 Feb 2023 07:24:48 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> Added specific class loader object to proxy IllegalArgumentException from which the class was not visible
>> 
>> The bug report for the same: https://bugs.openjdk.org/browse/JDK-8302791
>
> src/java.base/share/classes/java/lang/reflect/Proxy.java line 881:
> 
>> 879:             if (type != c) {
>> 880:                 throw new IllegalArgumentException(c.getName() +
>> 881:                         " referenced from a method is not visible from class loader: " + ld);
> 
> The ClassLoader string representation may or may not be useful here. One suggestion is to use the class loader name (ld.getName()) if not null, otherwise Objects.toIdentityString(ld).

I also think it's helpful to print the name of class loader if present, or the identity string as Alan suggests.

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PR: https://git.openjdk.org/jdk/pull/12641