... We review our experience, including some lessons learned, with using Java to create data browsing tools for use with the Astronomy Digital Image Library (ADIL) and related digital library projects at NCSA. ... For the specific problems of image data browsing, Java allows a server to pass on some of the CPU chores to the individual clients. ... Project Horizon is now working to combine those features into a single package of reusable Java code called the Horizon Java Image Data Browser Package. ...