Jackson serializing: Get list of processed objects

For a special case, I need to know which “source objects” of the object tree Jackson processed during serialization.

public class A {}

public class B {
   private A a;
}

public class Main {
   public void doIt() {
      B b = new B();
      b.a = new A();
      m.writeValueAsString(b)

      // Here I need to get the list of all processed objects from mapper m, i.e. [a,b]
   }
}

JavaScript
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public class A {}​public class B {   private A a;}​public class Main {   public void doIt() {      B b = new B();      b.a = new A();      m.writeValueAsString(b)​      // Here I need to get the list of all processed objects from mapper m, i.e. [a,b]   }}​

I think there is some internal list, because Jackson might reuse already serialized objects if they are referenced multiple times in the object tree. Can I get this list? Or is it possible to build my own list by an event listener which is called for every serialized object?

Answer

I found a solution with a PropertyFilter. I’m collecting all the objects seen in serializeAsField and at the end I’ve a complete list of traversed objects.

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Answer