Code review request for 7049774

Chris Hegarty chris.hegarty at
Thu Jun 9 16:05:52 UTC 2011

I looks like this change may break the UID spec.

"# time, a long equal to a time (as returned by 
System.currentTimeMillis()) at which the VM that this UID was generated 
in was alive, or zero for a well-known UID  "

'time' may no longer be equal to currentTimeMillis.

It looks like count is incremented for every UID created. I wonder if it 
may only be necessary to increment count if there is another UID created 
with the same time. This would allow a much larger number of UID's to be 
created before encountering the issue you are seeing?

I'm guess that this change is actually targeted to jdk8, rather than the 
'compare against' gate shown in the webrev.


On 06/ 9/11 04:26 PM, Seán Coffey wrote:
> 7049774 : UID construction appears to hang if time changed backwards
> I'm looking for code review of above reported issue. If system clock goes
> backwards on rmi server with active clients and 64k UID boundary is hit,
> the server will wait until system time progresses past the time at which
> UID class
> was instantiated.
> Fix is to not to use earlier times for such corner cases.
> bug ID should become public on over coming day.
> webrev :
> Regards,
> Sean.

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