Access enclosing Instance at runtime

Question

I try to create a general Method to get a new Instance of a given Object:
class A {
     public B b = new B();
     public class B {
public class SpeedTest {
     public static Object getMeANew(Object o) {
          Class c = o.getClass();
          try {
               return c.newInstance();
          } catch (Exception e) {               
               e.printStackTrace();
          return null;          
     public static void main(String[] args) {               
          A a = new A();
          Object obj = getMeANew(a);  // this is just fine
          obj = getMeANew( ((A)obj).b); // runtime error
}I can't create an Instance of B at runtime.
I played with the new method and got this:
        public static Object getMeANew(Object o) {
          Class c = o.getClass();
          Class decl = c.getDeclaringClass();
          if (decl != null) {
               Constructor cons = null;               
               try {
                    cons = c.getConstructor(decl);
               } catch (Exception e) {               
                    e.printStackTrace();
               try {
                    return cons.newInstance(decl.newInstance());  // << problem
               } catch (Exception e) {               
                    e.printStackTrace();
          } else {          
               try {
                    return c.newInstance();
               } catch (Exception e) {               
                    e.printStackTrace();
          return null;          
     }But this is not a full solution consider this example:
class A {
     public int value;
     public B b = new B();
     public class B {
          public void print() {
               System.out.println(value);
        public static void main(String[] args) {               
          A a = new A();
          a.value = 100;
          a.b.print();  // << prints 100
          a.b = (A.B)getMeANew(a.b);
          a.b.print(); // << prints 0
     }I want that both print() result in '100' so i'am looking for something like:
cons.newInstance(o.getEnclosingInstance());   // << Something that don't require a new field in every ObjectIs this possible ?

Answer 1

Nobody has a solution?
What is the qualified name to access the enclosing class instance (i.e. the "this$0" member)?
Or, for the code snippet below, what is the qualified name for the getEnclosingClass() method?
public class Foo
    int i = 42 ;
    public class Bar { }
    public static Object getEnclosingClass(Object o)
     try { return o.getClass().getDeclaredField("this$0").get(o) ; }
     catch (NoSuchFieldException x) {}
     catch (IllegalAccessException x) {} ;
     return null ;
    public static void main(String[] args)
     Foo foo = new Foo() ;
     Bar bar = foo.new Bar() ;
     System.err.println(((Foo)getEnclosingClass(bar)).i) ;
}thx for assistance!