Trying to run java program

I am trying to run a program called j perf, a graphical front end for iperf a network measurement tool.
when i type java jperf i get this error message
Exception in thread "main" java.lang.NoClassDefFoundError
looking for assistance
thanks

Well,
I assume jperf is the name of you class that has the main method in it. If not then this is one problem.
If you application uses anything other than classes out of the standard Java rt.jar file then you need to specify the additional jar files in the classpath
java -classpath myPackage.jar jperf
P.S. If you main class is called jperf maybe you should think of a better name with a bit of capitalisation.
IPerfGraphicalFrontEndMain maybe? OK it is more typing but using names that say what they are helps a lot in the end.

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