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<declare-warning expr="class($instanceof{VehicleDAO}) \ AND !has(public void *->save())"> All VehicleDAO subclasses must override the save() method. </declare-warning>
The above declaration says that if any subclass of VehicleDAO does not implement a noargs save() method, a
warning with the supplied message should be logged. Your application will continue to be instrumented/run
(since we are using declare-warning
in this case).