CODEWITHSUNDEEP
javaexceptionmethodsinvoke
John Moon
John Moon

Reputation: 11

Method.invoke and exception

How can I use invoke in method compare(T o1, T o2) if me

Upvotes: 0

Views: 444

Answers (1)

ppeterka
ppeterka

Reputation: 20726

As Aubin pointed out: comparators are called very-very many times! Using a slow reflection in a comparator seems to be a suicide in a magnificent and glorious way. I can't imagine ever having to do that (just because the fact you can't shouldn't compare apples to oranges, and if you only have apples, you already know how to compare them)!

I don't see, why you want to do this. If you'd post the code you have so far, this would be a lot more clear, and we could help you a lot better!

However, to answer your question on how to catch exceptions thrown by a method invoked through reflection:

Look at the API doc for Method.invoke()

It clearly states to throw an InvocationTargetException when the invoked method terminated by throwing an exception:

InvocationTargetException - if the underlying method throws an exception.

so this is what you could do, using the Throwable.getCause() to get the original exception:

try {
    myMethod.invoke(myArgs...);
} catch(InvocationTargetException e) {
    Throwable myOriginalException = e.getCause();
}

Upvotes: 2

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