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    <p>The error is because when you call <code>cancel()</code> the <code>Timer</code> is 'dead' and you can't do anything else with it.</p> <p>From the <a href="http://download-llnw.oracle.com/javase/6/docs/api/java/util/Timer.html#cancel()" rel="noreferrer">API</a>:</p> <blockquote> <p>Once a timer has been terminated, its execution thread terminates gracefully, and no more tasks may be scheduled on it. </p> </blockquote> <p>You have a few options:</p> <ol> <li>Get rid of the static <code>Timer</code> and instead hold a separate instance of <code>Timer</code> within each object. That way when the object is destroyed, you can also destroy the <code>Timer</code> without affecting the other <code>TimerTask</code>s. This will mean one timer thread per object.</li> <li>Keep the static <code>Timer</code> but also hold in memory (e.g. in an <code>ArrayList&lt;TimerTask&gt;</code>) a list of all the tasks within it. Then when an object is destroyed, you re-create the static <code>Timer</code> object using the in-memory list of tasks (minus the one corresponding to the object you destoryed). The consequence of this is that the execution of the remaining <code>TimerTask</code>s may need some finessing (particularly if you don't want them all to 'bunch up').</li> <li>Extend or write your own <code>Timer</code>-like class to allow for the removal of <code>TimerTask</code>s. (Someone may have already done this, I don't know)</li> <li>Use a <a href="http://download.oracle.com/javase/6/docs/api/java/util/concurrent/ScheduledThreadPoolExecutor.html" rel="noreferrer">ScheduledThreadPoolExecutor</a> which allows you to remove tasks.</li> </ol>
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    1. POCan a Java static Timer handle multiple TimerTasks calling cancel()?
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    1. POCan a Java static Timer handle multiple TimerTasks calling cancel()?
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    1. COGreat advice for the options! Though to clarify: the timer is terminated even though I'm calling cancel() on the TimerTask and not the static Timer itself?
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      1. USvazor
    2. COYeah, I mis-read that. You should be able to cancel the TimerTask without any problems. If you're 100% sure that your calls are only to TimerTask.cancel() and not Timer.cancel() then have a look here: http://www.coderanch.com/t/452066/java/java/Exception-timer-IllegalStateException
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    3. COScheduledThreadPoolExecutor has solved my issue also, thanks!
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