Declare parents aspectj - spring

Question

Firstly I try xml configuration:
<aop:aspect>
<aop:declare-parents types-matching="DBOperations.ILearningData+"
implement-interface="DBOperations.ISaveResults"
delegate-ref="saverExtension"/>
</aop:aspect>
and it works good.
Now I try to make aspectj, which should do the same:
public aspect ASaveResults {
public ASaveResults() { }
declare parents : TSaveResults implements ILearningData;
}
where TSaveResults is the same as the bean "saverExtension".
I run my code:
...
#Value("#{learningData}")
protected ILearningData saver;
...
((ISaveResults)saver).saveResults();
and get the error:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: sun.proxy.$Proxy12 cannot be cast to DBOperations.ISaveResults
what is the problem with my aspectj?
Also I tried this code unsuccessfully:
public aspect ASaveResults {
public ASaveResults() { }
declare parents : ISaveResults implements ILearningData;
public void saveResults() {
System.out.println("saver aspect");
}
}

Answer 1

What you used there is core aspectj, so if you want to use Spring AOP, but not xml config then this is what you should do (not tested):
#Aspect
public class ASaveResults {
#DeclareParents(value="ISaveResults")
public static ILearningData interf;
public void saveResults() {
System.out.println("saver aspect");
}
}

Answer 2

public aspect ASaveResults {
public ASaveResults() { }
declare parents : LearningData extends TSaveResults;
}
where LearningData and TSaveResults - classes. So now TSaveResults extends LearningData - this was my goal