<AWT Dev> <AWT dev>[9] Review request for JDK-8165555: [macosx] VM crashes on second attempt to execute JCK interactive tests that use Robot (single JVM, agent)

Sergey Bylokhov Sergey.Bylokhov at oracle.com
Fri Sep 23 16:08:56 UTC 2016

On 21.09.16 16:01, Manajit Halder wrote:
> Access to "instance" is not broken. The problem is with the dictionary
> variable "javaToMacKeyMap" within the "instance" reference.
> The dictionary is not getting initialised for the second time when
> singleton method is called for the second time. The dictionary is
> getting initialised during the first time singleton method is called and
> hence crash was observed. Tried adding self.javaToMacKeyMap
> but doesn’t solve the problem.

If the "instance" is correct object then why the field inside is not 
initialized, probably we incorrectly release it somewhere?

> I propose two solutions to this problem:
> Solution 1:
> Reinitialise the dictionary every-time the singleton method is called.
> Webrev:
> http://cr.openjdk.java.net/~mhalder/8165555/webrev.01/
> Drawback:
> dictionary is initialised multiple times (every time singleton method is
> called).
> Solution 2:
> Make the dictionary static.
> Drawback:
> Still dictionary need to be initialised multiple times.
> No singleton method, just two static methods, one method to initialise
> the dictionary and other to get the key form the dictionary.
> Webrev:
> Not prepared. Will be prepared if second solution accepted.
> Test case:
> There are no test cases. Problem can be reproduced by
> executing following JCK test:
> java -jar JCK-runtime-9/lib/jtjck.jar -mode:single -k:interactive
> "api/java_awt/interactive/event/EventTests.html#EventTest0019
> api/java_awt/interactive/event/EventTests.html#EventTest0013”
> Thanks,
> Manajit
>> On 20-Sep-2016, at 4:42 am, Sergey Bylokhov
>> <Sergey.Bylokhov at oracle.com <mailto:Sergey.Bylokhov at oracle.com>> wrote:
>> Hi, Manajit.
>> It seems that after the fix "(CRobotKeyCodeMapping *) sharedInstance"
>> returns the new object per invocation, so it is not really
>> sharedInstance. I am not sure I understand what is wrong in the
>> current code, from the my point of view this is a correct singleton.
>> It it true that the problem is in access to broken "instance" and not
>> to "javaToMacKeyMap" inside the "instance"? If not then
>> "javaToMacKeyMap" should be changed to "self.javaToMacKeyMap".
>> Do you have a test case to reproduce the bug?
>> On 19.09.16 15:26, Manajit Halder wrote:
>>> Hi All,
>>> Kindly review the fix for JDK9.
>>> Bug:
>>> https://bugs.openjdk.java.net/browse/JDK-8165555
>>> Webrev:
>>> http://cr.openjdk.java.net/~mhalder/8165555/webrev.00/
>>> Issue:
>>> [macosx] VM crashes on second attempt to execute JCK interactive tests
>>> that use Robot (single JVM, agent)
>>> Cause:
>>> While executing the JCK test for the second time the robot was getting
>>> initialised once again and old instance of CRobotKeyCodeMapping was not
>>> available.
>>> Crash was observed while trying to access invalid instance of
>>> CRobotKeyCodeMapping.
>>> Fix:
>>> A new instance of CRobotKeyCodeMapping is created when robot is
>>> initialised.
>>> Regards,
>>> Manajit
>> --
>> Best regards, Sergey.

Best regards, Sergey.

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