Example of a JNI plugin using jnigen to auto-generate bindings for PDFBox java library.
Bindings can be generated by running dart run jnigen --config jnigen.yaml. Required source code and JARs will be downloaded using maven (requires mvn command).
jnigen is also available as an API which tooling scripts can use. See tool/generate_bindings.dart for the script equivalent of the YAML file.