Groovy catch a parent Exception but NOT a children Exception

Question

(context: integrating with an application -Jenkins- with various plugins not all with good design)

I have these exception:

public class AbortException extends IOException

and in some cases I want to catch IOException but avoid catching the AbortException

Which one is more correct?

try {
...
} catch (AbortException e) {
    throw e //this failure should fail
} catch (IOException e) {
    [handle this]
}

or

try {
...
} catch (IOException e) {
    if (e instanceof AbortException)
        throw e //this failure should fail
    else
        [handle this]
}

I am unsure if in the first case the second catch block would intercept the re-thrown AbortException