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Metaphile is a Java library for reading image metadata. It supports JFIF, JFXX, IPTC IIM (V3 and V4), EXIF (2.1 and 2.2) and XMP (Dublin Core, Photoshop, Iptc4XMPCore, Rights Management)
Java access to USB, currently using kernel 2.4 Linux-USB support. There is a "core" API for accessing USB devices, and simple tools including a USB viewer in Swing. Applications are being developed separately, including digital camera support.
This project builds on the jUSB APIs, initially supporting the Picture Transfer Protocol (PTP) over USB on Linux. The software is GPL'd, and includes an extensible core library (for developers), commandline support, and user tools.