Corner Radius to rectangle annotation not working

Product: Java API

Product Version: Latest

Please give a brief summary of your issue: Corner Radius to rectangle annotation not working
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Please describe your issue and provide steps to reproduce it:
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I am trying to set corner radius to Rectangle annotation as below. But its not showing rounded corners as per the radius set. Could you please let me know what is the correct way to set the corner radius
int style = BorderStyle.e_solid;
int b_width = 1;
int b_hr = 3
int b_vr = 3
BorderStyle borderStyle = new BorderStyle(style, b_width, b_hr, b_vr);

Please provide a link to a minimal sample where the issue is reproducible:

Want to check if this is possible with PDFTron API or not?