C++ loses reference to Java Director instance

I am having a weird issue with SWIG-wrapped classes in Java: it looks like my SWIGed C++ code is losing a reference to a Java Director instance if called out of the original scope.  Here's my structure in C++:

class Factory : public BaseFactory<Car> {
    Factory::Factory(Getter& getter)
    : BaseFactory<Car>(getter)
    {};
         
    ...
};

template typename<T>
class BaseFactory
{
   BaseFactory(Getter& getter)
   : _getter(getter.clone())
   {};
  
   void run()
   {
      _getter->doSomething();
   }
   ...
  
   private Getter* _getter;
}

Now, Factory, BaseFactory and Getter are all wrapped in SWIG, and Getter is a director with a JavaGetter that extends it:

public class JavaGetter extends Getter
{
   public JavaGetter(JavaGetter other)
   {
   ...
   }
  
   public JavaGetter clone()
   {
      return new JavaGetter(this);
   }
}

Now here's where things get nutty.  I have a function like this:

   JavaGetter g = new JavaGetter();
   Factory factory = new Factory(g);
  
   doStuff(factory);
   factory.run();
 
If I call factory.run() within the above scope everything works fine.  The SWIGed Factory instance calls the JavaGetter instance from C++ and everything's great.  However, if I pass 'factory' to another function in another scope (say doStuff()), it looks like the underlying C++ Factory instance loses the reference to JavaGetter: within that scope, if I examine Factory in C++, the reference is no longer valid, and calling factory.run() blows up the JVM.

I am guessing there's an interaction with clone() here somewhere: if I take out clone() from the copy constructor of BaseFactory() everything works fine in Java, regardless of scope (it blows up the C++ client though which is not an option).

Is the temporary JavaGetter() called in the BaseFactory constructor not in scope and thus gone outside the above function? if so, is there a way for me to pin it down in the BaseFactory instance and then release it later?

Costas


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