throwing exception from finally block (try-finally clause without catch block)

[Gasan Guseynov]

Hi all.

Here is the code example:

    
public class ExceptionTest {
	public static void main(String[] args) {
		ExceptionTest test = new ExceptionTest();
		try {
			test.foo();
		} catch (Exception e) {
			System.out.println(e.getMessage());
		}
	}

	private void foo() throws Exception {
		try {
			throw new Exception("e");
		} finally {
			boo();
		}
	}

	private void boo() throws Exception {
		throw new Exception("b");
	}
}

And my question is: what's happening with "e" exception? It seems that jvm completely forgot about it.

[Paul Clapham]

Yes, that's one way of describing it. As you found out, the exception thrown in the finally block replaces the exception thrown in the try block. There can only be one exception thrown by a method, of course, so it's necessary to choose one. The choice is: the last one thrown.

[Ernest Friedman-Hill]

As a result, most people consider it very bad style to throw an exception -- or allow one to be thrown -- from a finally block.

[Gasan Guseynov]

Many thanks all. It's very usefull information.