RFR (S): 8241704: Add test case for unloadable class with nest host error

[David Holmes]

Thanks Mandy! I only found out about ClassUnloadCommon after reinventing 
part of it :)

David

On 31/03/2020 6:31 am, Mandy Chung wrote:
> Hi David,
> 
> The new test looks fine to me.  Thanks for the elaborated comment that 
> helps to understand how this test sets up.  (Caveat: I'm not familiar 
> with ClassUnloadCommon test library)
> 
> Mandy
> 
> On 3/30/20 7:01 AM, David Holmes wrote:
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8241704
>> webrev: http://cr.openjdk.java.net/~dholmes/8241704/webrev/
>>
>> After JDK-8241562 there is an untested code path in 
>> ResolutionErrorTable::free_entry if we can unload a class that had a 
>> nest host validation or resolution error. So I took an existing nest 
>> host membership test (where the claimed host is in another package) 
>> and ran it in a new classloader and then triggered unloading. With a 
>> debugging printf enabled this showed the previously unused code path 
>> being executed.
>>
>> Thanks,
>> David
>