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Editorial Team
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Asked: 2026-06-02T17:33:06+00:00

In Java 5, the ExecutorService interface declares the method: <T> List<Future<T>> invokeAll(Collection<Callable<T>> tasks) throws

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In Java 5, the ExecutorService interface declares the method:

<T> List<Future<T>> invokeAll(Collection<Callable<T>> tasks)
    throws InterruptedException;

whereas Guava 11.0.2, written in Java 6 but supposedly compatible with Java 5, overrides it in ListeningExecutorService as:

 <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks)
     throws InterruptedException;

If I want to implement my own ListeningExecutorService, I would need to implement both of these methods, but I am also not able to have two methods the same erasure, so it’s a bit of a Catch 22.

Is there any way around this problem? More specifically, is there any way to implement a ListeningExecutorService in Java 5?

As a side note to any Guava folks–is it actually necessary for Guava to re-declare this method since it’s already inherited from ExecutorService?

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1 Answer

  1. Editorial Team

    The way that we made this work was to override the JDK’s ExecutorService interface in our bootclasspath. You could do something similar during your project’s compilation. The easiest way to see our setup is probably the change that removed it for release 12 (since that release will require JDK6).

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