Please give a bit more detail than simply "it doesn't work". What unexpected behaviour are you seeing? What behaviour did you expect to see? Are you getting any error messages? Is anything written to the web server error log?

It's probably a difference between a process running under your username and the web server process that runs under a different username - that almost certainly has different permissions on files and a whole different environment set up. The most obvious suspects I can see are that the web server user doesn't have the "java" command in it's path or that the JavaClassFile isn't in the current directory.

But without a more detailed description of your problem, it's impossible to do more than guess.