Wildcard cast problem

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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