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    <p>Wrapping the exception in the described way does not work. I tried it and I still get compiler errors, which is actually according to the spec: the lambda expression throws the exception which is incompatible with the target type of the method argument: Callable; call() does not throw it so I can not pass the lambda expression as a Callable.</p> <p>So basically there is no solution: we are stuck with writing boilerplate. The only thing we can do is voice our opinion that this needs fixing. I think the spec should not just blindly discard a target type based on incompatible thrown exceptions: it should subsequently check whether the thrown incompatible exception is caught or declared as throws in the invoking scope. And for lambda expressions that are not inlined I propose we can mark them as silently throwing checked exception (silent in the sense that the compiler should not check, but the runtime should still catch). let's mark those with => as opposed to -> I know this is not a discussion site, but since this IS the only solution to the question, let yourself be heard and let's change this spec!</p>
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    1. POJava 8: Mandatory checked exceptions handling in lambda expressions. Why mandatory, not optional?
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    1. USWaldo auf der Springe
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    1. COThe wrapping is described just like it could imitate a checked-exception-less `Supplier<T>` instead of `Callable<T>` -- that is a surrogate way and it works for most cases that I was faced with. I personally would change the behavior of lambda expressions / functional interfaces for checked exceptions. But I have doubt that the lambda-dev team will agree to change that behavior for lambda's. Unfortunately Java checked exceptions are good by intention, but harmful in practice. This is similar to wrapping a checked exception into `RuntimeException` within `try/catch` in every method.
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      1. USLyubomyr Shaydariv
    2. COWell, there is a way to kind of genericly wrap the checked exception which is slightly more eloborate then described, see my upcoming answer. But still, I agree with you that our programming lives would be better if the compiler would work a bit harder and allow us to throw checked exceptions in our lambdas. As it stands we are deprived of catching specific checked exceptions that occur there, forcing us into ugly cumbersome coding. yuck!
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      1. USWaldo auf der Springe
    3. COBy the way, you can try to suggest your idea for simplified checked exceptions handling to lambda-dev team via their mailing list. If they approve your email (not idea itself) -- you might know their pros and cons for changing the spec, and probably personal ideas and thoughts by Brian Goetz too.
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      1. USLyubomyr Shaydariv
 

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