Re: Evil Behavior with Unchecked Checked Exceptions

Johannes Brodwall — Thu, 19 Jul 2007 18:51:58 -0000

Hi, Harald

The code as it stands doesn't work. I expect the template code was eaten by the HTML-izer of both my blog and/or crazy bob's blog. Here is the correct code:

<pre>


    public static void throwIt2(final Throwable exception) {
        class Thrower<T extends Throwable> {
            private void sneakyThrow(Throwable exception) throws T {
                throw (T)exception;
            }
        }
        new Thrower<RuntimeException>().sneakyThrow(exception);
    }

</pre>

I don't even get a compiler warning. This is a very neat trick.

Re: Evil Behavior with Unchecked Checked Exceptions

.k — Tue, 17 Jul 2007 19:33:47 -0000

It can actually be a lot easier than Anders' example. See this http://weblogs.java.net/blog/crazybob/archive/2...
for even more clever implementations. :-)

I propose a utility-class with something like this, and we're good to go:

public static void throwUnchecked(final Throwable pException) {
// Type parameter to Thrower is erased at compile-time
new Thrower().sneakyThrow(pException);
}

private static class Thrower {
private void sneakyThrow(Throwable pException) throws T {
throw (T) pException; // Unchecked cast
}
}

I'm starting to think this might be useful.. Or... Maybe I'm just tired.. :-P

.k

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