Calling a .jar file from the command-line in headless mode--say, from a web-server--seems to pose a problem under OS X Tiger, in that java requires communication w/ the GUI system. (This leads me to believe that the problem applies under Linux as well.)
The solution is the "-Djava.awt.headless=true" parameter; for example, here's how I call the Batik SVG rasterizer:
/usr/bin/java -Djava.awt.headless=true -jar /Library/WebServer/Documents/py/archive/batik-1.7/batik-rasterizer.jar -w 1000 -h 1000 -bg 255.255.255.255 xxx.svg
I knew I didn't trust that newfangled Java.
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