I need to connect physical scanner device and send scanning request then get the image. I got it by using asprise-imaging-core.jar but unfortunately its not free
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Morena seems to be a free Java TWAIN library for non-commercial use (I haven't used it).
Also see
- How i can get image from printer "Scanner"
- TWAIN/WIA example for java
- And here's someone who managed to wrap a free DLL with JNI (apparently after fixing some bugs in the DLL): https://www.infoworld.com/article/2074455/bridge-the-gap-between-java-and-twain.html
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I have used Morena, and it is working quite fine. – Dorian Gray Dec 25 '20 at 10:34