Creating event objects

If I may impose again for some help....

I'm trying to invoke a method that's intended to take an object as an event
handler.  The method (of a class called MbtQuote) is:

public void AdviseSymbol(Object[] pNotify,String bstrSymbol,int
lServiceFlags) throws COMException

the first parameter is documented to take an instance of "IMbtQuotesNotify"

The class IMbtQuotesNotify was generated as a class derived from COMPtr
(not DispatchPtr as most of the others are) and has no generated
constructor.  If I simply new up one these and pass it to the AdviseSymbol
method, I get a fatal exception the the following console output:

java.lang.Error: Type cannot be marshalled to variant: class
mbt.IMbtQuotesNotify
 at org.jawin.Variant.marshalIn(Variant.java:106)
 at org.jawin.Variant.marshalInArray(Variant.java:300)
 at org.jawin.Variant.marshalIn(Variant.java:68)
 at org.jawin.DispatchPtr.invokeN(DispatchPtr.java:467)
 at org.jawin.DispatchPtr.invokeN(DispatchPtr.java:433)
 at mbt.IMbtQuotes.AdviseSymbol(IMbtQuotes.java:147)
 at xqqq.TestMBTConnect.main(TestMBTConnect.java:79)

here's the code:

   IMbtQuotes quotes = commMgr.getQuotes();
   Object[] ObjectParam = new Object[1];
   ObjectParam[0] = new IMbtQuotesNotify();
   quotes.AdviseSymbol(ObjectParam, "QQQ",
                       enumQuoteServiceFlags.qsfLevelOne);

I assume the problem here is that the instance I'm passing it does not
represent an existing COM object instance.  I tried to steal the code from
the constructor of DispatchPtr but I got an exception complaining that the
class was not registered.

What do I need to do property create the object that this method wants?

Thanks again for the help!

--john