How to run multiple Thread using Scheduler's in 1.5

Hi,
I have a scenario, in which I have to run a Thread at every 15 minutes, If the first Thread is not Finished in 15 min then new Thread has to start.
Currently I implemeted with java 1.5 schedulers, but the problem is if my first Thread is taking more than 15 min, then no new Thread is starting.
Following is my Code:
TestAccountingThread accountingThread = new TestAccountingThread();
ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(10);
scheduler.scheduleAtFixedRate( accountingThread, 0, 60, SECONDS );
Can any one help on this, This is really urgent.
Regards,
Suman

if my first Thread is taking more than 15 min, then no new Thread is startingIf it takes more than 15 min, manually run a new scheduler with initial-delay=0 and shutdown the current one when the current execution is finished --- and repeat this logic in a conditional loop.
Could this be what you want?

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          >>>
          >>
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