Is there a way to make Runnable's run() throw an exception?

Question

A method I am calling in run() in a class that implements Runnable) is designed to be throwing an exception.

But the Java compiler won\'t let me do that and suggests

Answer 1

Yes, there is a way to throw a checked exception from the run() method, but it's so terrible I won't share it.

Here's what you can do instead; it uses the same mechanism that a runtime exception would exercise:

@Override
public void run() {
  try {
    /* Do your thing. */
    ...
  } catch (Exception ex) {
    Thread t = Thread.currentThread();
    t.getUncaughtExceptionHandler().uncaughtException(t, ex);
  }
}

As others have noted, if your run() method is really the target of a Thread, there's no point in throwing an exception because it is unobservable; throwing an exception has the same effect as not throwing an exception (none).

If it's not a Thread target, don't use Runnable. For example, perhaps Callable is a better fit.