I trying to automate the testing of CAD app written in Java with a
tool called Rational Robot.

Robot writes in a BASIC derived language. I am using the SetCursorPos
&& GetCursorPos Window's API to draw diagrams.

However I need to send WM_LBUTTONDBLCLK to the app, but I am unable
to retrieve a Java Window/Objects handle. It is returning a '0' when
trying to get the hWnd.

Can anyone tell how I could get the hWnd or a alternative method to
simulate mouse-events