More precise exception rethrow

The more precise rethrow is a tricky one to understand. See if you can spot what the new feature is in the example below. Will it compile on pre-java-7? If not how would it need to be changed to compile on pre-java-7? The answers lie after the example.

public class MorePreciseExceptionRethrow {

    static class Exception1 extends Exception {}
    static class Exception2 extends Exception {}

    public static void main(String[] args) throws Exception1, Exception2 {
        try {
            boolean test = true;
            if (test) {
                throw new Exception1();
            } else {
                throw new Exception2();
            }
        } catch (Exception e) {
            throw e;
        }
    }

}

On Java 6 compiling the above gives the following exception.

Foo.java:18: unreported exception java.lang.Exception; must be caught or declared to be thrown
            throw e;
            ^
1 error

This can be fixed for Java 6 by changing:

public static void main(String[] args) throws Exception1, Exception2 {

to:

public static void main(String[] args) throws Exception {{

So now you see the improvement that Java 7 offers with this feature. You can be more precise in the declaration of the exceptions that you rethrow. Very nice indeed.