can't view downloaded java objects

i downloaded a java4gl object down to my computer and

tried running it and i got this error msg

Exception:java.lang.NoClassDefFoundError: gl4java/awt/GLAnimCanvasException:java.lang.NoClassDefFoundError: gl4java/awt/GLAnimCanvas

i've installed the necessary java se stuff but it still appears

could anyone tell me why?and how i can rectify the problem

thanks in advance

bryan

[419 byte] By [beanzrulz] at [2007-9-27 19:33:17]