If you really, really must do this, and you are sure you are not making a mistake, check out the @SuppressWarnings annotation. I suppose in your case you need
@SuppressWarnings("fallthrough")
Is the annotation @SuppressWarnings
(javadoc) what you are looking for?
For example:
@SuppressWarnings("unchecked")
public void someMethod(...) {
...
}