OpenExif is an object-oriented library for accessing Exif formated JPEG image files. The toolkit allows creating, reading, and modifying the metadata in the Exif file. It also provides means of getting and setting the main image and the thumbnail image.
joti - Java phOTo Index / Album, apply categories to your photos. Search images in categories. Show photo metadata. Predefine default file struture like /CAMERA/DATEPATTERN. Export to external archives and still keep thumbnail to find them.