How can I re-throw an exception in a lambda block as from the outer block?

Question

With following code,

void key(Key) throws SomeCheckedException {
}

void supplier(Supplier s) throws Some         


        

Answer 1

You can't. Supplier#get() does not declare to throw any (checked) exceptions. Remember that a lambda expression simply creates an instance, it doesn't actually invoke the target functional interface method.

If you want to, you can wrap the checked exception in an unchecked exception and throw that.