what happened to the java bridge, seemed like a good idea but was never really finished.
As far as we know it never got "developed on" so is now defunct.
You may learn more with a forum search:
https://community.appinventor.mit.edu/search?q=java%20bridge
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The Java Bridge was a research project out of USF that explored converting App Inventor projects into Eclipse projects that compiled with the standard Android toolchain. It was never an official product of the MIT App Inventor team. As far as I am aware, the project was not open sourced.
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