Hi all, When I compile vtk4.4.2 with java1.5 on solairs9/10, I got a lot of problems. Finally, I worked that out and vtk runs beautifully on my machine. I wrote the following compilation guideline. It may help a lot new users like me. http://www.visualgenomics.ca/xdong/vtk/vtk4.4.2/compile.html Xiaoli