This program should compile:

public class Test {
	public void saveA (AbstractClass<?> busObj) {
		// Error here
		ConcreteClass sqlA = (ConcreteClass) busObj;
	}
}
 
abstract class AbstractClass<B> {
	public abstract void doSomething (B b);
}
 
class ConcreteClass extends AbstractClass<String> {
	public void doSomething (String b) {
	}
}

See http://forum.java.sun.com/thread.jspa?threadID=636425&tstart=0

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