RFR (M): JDK-8038587: [TESTBUG] Create CDS tests to exercise region sizes and classlist

Mikhailo Seledtsov mikhailo.seledtsov at oracle.com
Tue Apr 1 21:06:46 UTC 2014

Hi David,

  Thank you for review and your feedback.

The intent of this test is sanity check of basic functionality, making 
sure the shared classes are loaded w/o crashes or errors. Even though 
creating a shared archive with -Xshare:dump does exercise loading of the 
classes from the classlist, I believe SQE should verify it, by 
explicitly performing this operation. In my experience I have found that 
basic tests often find interesting bugs.

I did drop the attempt to instantiate classes, because  the amount of 
classes in the class list that have default constructors and instantiate 
successfully is quite small, and not worth the trouble. Many classes 
fail instantiation due to the absence of UI, or other valid reasons. 
What I have found, however, as part of this exercise, is that the 
default SE classlist is optimized for the client, not the server.

As for classes that are part of the classlist, but are really missing 
from rt.jar: will you consider this to be a bug?

Thank you,

On 4/1/2014 1:46 AM, David Holmes wrote:
> Hi Misha,
> On 28/03/2014 5:34 AM, Mikhailo Seledtsov wrote:
>> Please review these 3 new CDS tests, an ongoing effort in implementation
>> of the CDS test specification.
>>      JBS: https://bugs.openjdk.java.net/browse/JDK-8038587
>>      Webrev: http://cr.openjdk.java.net/~mseledtsov/8038587/webrev.00/
>>      Testing:
>>          Local testing on multiple platforms
>>          JPRT to exercise the added tests:
>> 2014-03-27-184953.mseledtsov.cds (PASS)
>>          These tests found 2 bugs, and one potential issue
> I don't quite get the point of the ClassListExerciser test. The 
> classlist may well contain classes that do not exist, or that can not 
> be instantiated in the test context, even if they have a no-arg 
> constructor. Simply creating an archive "exercises" the classlist, so 
> I'm really not sure what this test is intending to test.
> Also this test won't work with SE Embedded as we have a customized 
> default classlist for the Embedded stack.
> Thanks,
> David
>> Thank you,
>> Misha

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