I want to create a .dst embroidery file using Java. Are there any supporting libraries available? Or is it possible to convert any kind of image file to the .dst embroidery file
I am the developer at Embroidermodder working on formats (the link mentioned by theJollySin). I don't have any Java code, but I can point you to some preliminary documentation of the format (http://www.achatina.de/sewing/main/TECHNICL.HTM).
What are you trying to create in DST? I can assist you with whatever issues you have getting your Java code running.