Is there any tracing or debugging in the Linux implementation?
There is rather extensive tracing included in the Linux implementation’s JNI code, mainly because JNI code is difficult to write and even more difficult to debug. However it also provides a relatively good trace of all the javax.usb interaction with the system and USB devices. To enable and configure the tracing, see the javax.usb.properties file, which contains the settings and documentation of how to configure them.
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