What should Timertask.scheduleAtFixedRate do if the clock changes?

Question

We want to run a task every 1000 seconds (say).

So we have

timer.scheduleAtFixedRate(task, delay, interval);

Mostly, this works fin

Answer 1

It is reported here http://bugs.sun.com/view_bug.do?bug_id=4290274

Similarly, when the system clock is set to a later time, the task may be run multiple times without any delay to "catch up" the missed executions. Exactly this happens when the computer is set to standby/hibernate and the application is resumed (this is how I found out).

This behavior can also be seen in a Java debugger by suspending the timer thread and resuming it.