I'm getting the following compilation error:

```
Tester.java:10: unreported exception java.lang.ClassNotFoundException; must be caught or declared to be thrown
                Class stringClass = Class.forName("java.lang.String");

```

with this code:

```
class Tester {
    public static void main(String [ ] args) {
        Class stringClass = Class.forName("java.lang.String");
    }
}

```

Why is this?