Try replacing
------------------------------------
Context2d ctx = vw.getCtx(); 
int w = vw.getCvs().getCoordinateSpaceWidth(); 
int h = vw.getCvs().getCoordinateSpaceHeight(); 
------------------------------------

with
------------------------------------
Context2d ctx = cvs.getContext2d(); 
int w = cvs.getCoordinateSpaceWidth(); 
int h = cvs.getCoordinateSpaceHeight(); 
------------------------------------

vw.getCvs() always creates a new instance which you don't want to do.
And I suspect vw.getCtx() also calls vw.getCvs()
 

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