Avoiding multi-instance singletons in single context Spring app - spring

Question

A #PostConstruct function returns a System.identityHashCode(this) different from an #Autowired version of the "same" singleton...
I do not have multiple application contexts there is only a single context involved. I don't expect the presence of threading or static inner classes to be relevant, but I have included them just in case.
#Service
public class A extends Thread {
#PostContruct
public void init() {
start();
}
#Service
public static class B extends A {
public B() {
}
public void run() throws Throwable {
System.err.println("B("+System.identityHashCode(this)+") waiting...");
synchronized(this) {wait(6000000);}
System.err.println("B("+System.identityHashCode(this)+") done waiting the full 6000 seconds and never less");
}
}
private B b;
#Autowired(required=true)
public A(B b) {
this.b = b;
}
public void run() throws Throwable {
Thread.sleep(10000);//just for example
//the following lines could be triggered from any thread
System.err.println("autowire B("+System.identityHashCode(b)+").notifyAll()");
synchronized(b) {b.notifyAll();}
}
}
I expect the original hash code of B to match the Autowired hash code found from class A. However they are different objects and so notifyAll never interrupts B's wait.
B(329759586) waiting...
//10 seconds latter
autowire B(932795037).notifyAll()
//5990 seconds latter
B(329759586) done waiting the full 6000 seconds and never less