How to instrument `SuspendableRunnable`s ?

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Ahmet Özkök

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Jun 5, 2016, 1:27:07 PM6/5/16

to quasar-pulsar-user

I have some Runnable, and there is always a Null Pointer Exception with it. here is the code (which is from Experiment.java of desmoj):

try

{

this._schedulerStrand = this.getStrandFactory().create("proceed", new SuspendableRunnable()

{

private static final long serialVersionUID = -1079147860194926426L;

@Override

@Suspendable

public void run()

{

try

{

doProceed();

}

catch (SuspendExecution e)

{

throw new AssertionError(e);

}

});

this._schedulerStrand.start();

this._schedulerStrand.join();

this._schedulerStrand = null;

}

catch (AssertionError e)

{

if (e.getCause() instanceof SuspendExecution)

{

throw ((SuspendExecution) e.getCause());

}

throw e;

}

And here is the exception log:

java.lang.NullPointerException
at co.paralleluniverse.strands.Strand.park(Strand.java:458)
at desmoj.core.simulator.SimProcess.start(SimProcess.java:2133)
at desmoj.core.simulator.Scheduler.processNextEventNote(Scheduler.java:643)
at desmoj.core.simulator.Experiment.doProceed(Experiment.java:1459)
at desmoj.core.simulator.Experiment$2.run(Experiment.java:1386)
at co.paralleluniverse.strands.SuspendableUtils$VoidSuspendableCallable.run(SuspendableUtils.java:44)
at co.paralleluniverse.strands.SuspendableUtils$VoidSuspendableCallable.run(SuspendableUtils.java:32)
at co.paralleluniverse.fibers.Fiber.run(Fiber.java:1027)
WARNING: Uninstrumented methods (marked '**') or call-sites (marked '!!') detected on the call stack:
at co.paralleluniverse.strands.Strand.park) (Strand.java:458 bci: 56)
at desmoj.core.simulator.SimProcess.start) (SimProcess.java:2133 bci: 144)
at desmoj.core.simulator.Scheduler.processNextEventNote) (Scheduler.java:643 bci: 970) **
at desmoj.core.simulator.Experiment.doProceed (Experiment.java:1459 bci: 9) **
at desmoj.core.simulator.Experiment$2.run (Experiment.java:1386 bci: 76)
at co.paralleluniverse.strands.SuspendableUtils$VoidSuspendableCallable.run (SuspendableUtils.java:44 bci: 4)
at co.paralleluniverse.strands.SuspendableUtils$VoidSuspendableCallable.run (SuspendableUtils.java:32 bci: 1)
at co.paralleluniverse.fibers.Fiber.run (Fiber.java:1027 bci: 11)
at co.paralleluniverse.fibers.Fiber.run1 (Fiber.java:1022 bci: 1)

java.util.concurrent.ExecutionException: java.lang.NullPointerException
at co.paralleluniverse.fibers.Fiber.get(Fiber.java:1317)
at co.paralleluniverse.fibers.Fiber.join(Fiber.java:1292)
at desmoj.core.simulator.Experiment.proceed(Experiment.java:1396)
at desmoj.core.simulator.Experiment.start(Experiment.java:2225)
at desmoj.core.simulator.Experiment.start(Experiment.java:2167)

Caused by: java.lang.NullPointerException
at co.paralleluniverse.strands.Strand.park(Strand.java:458)
at desmoj.core.simulator.SimProcess.start(SimProcess.java:2133)
at desmoj.core.simulator.Scheduler.processNextEventNote(Scheduler.java:643)
at desmoj.core.simulator.Experiment.doProceed(Experiment.java:1459)
at desmoj.core.simulator.Experiment$2.run(Experiment.java:1386)
at co.paralleluniverse.strands.SuspendableUtils$VoidSuspendableCallable.run(SuspendableUtils.java:44)
at co.paralleluniverse.strands.SuspendableUtils$VoidSuspendableCallable.run(SuspendableUtils.java:32)
at co.paralleluniverse.fibers.Fiber.run(Fiber.java:1027)
at co.paralleluniverse.fibers.Fiber.run1(Fiber.java:1022)
at co.paralleluniverse.fibers.Fiber.exec(Fiber.java:732)
at co.paralleluniverse.fibers.RunnableFiberTask.doExec(RunnableFiberTask.java:95)
at co.paralleluniverse.fibers.RunnableFiberTask.run(RunnableFiberTask.java:86)
at co.paralleluniverse.common.util.SameThreadExecutor.execute(SameThreadExecutor.java:30)
at co.paralleluniverse.fibers.FiberExecutorScheduler.execute(FiberExecutorScheduler.java:77)
at co.paralleluniverse.fibers.RunnableFiberTask.submit(RunnableFiberTask.java:289)
at co.paralleluniverse.fibers.Fiber.start(Fiber.java:1058)
at co.paralleluniverse.fibers.Fiber.start(Fiber.java:79)
at desmoj.core.simulator.Experiment.proceed(Experiment.java:1395)