🚀 go-pugleaf

<wuliao999 none> wrote in message news:3b3ae3b8$1_1@dnews...
>
> When I just install JB4, it's all right. After a period time,
> java applications cannot run from command line. For example, I
> run an app:
> c:>java myApp
> then it says:
> Exception in thread "main" java.lang.NoClassDefFoundError: myApp

The "-classpath" option of the command line compiler/interpreter is very
important.
The <path> (native OS path with or without a jar file) set in the classpath
is the place where the java compiler/interpreter will look for the libraries
your app needs to run. This concerns the path to the app you want to start,
too (this is your case, interpreter cannot find the class you want to
start).
There is (at least in Windows) a system variable CLASSPATH, which is used
always you run a command line compilation/interpretation. If the path your
file is in or the path to pakages your file needs is not in the system
CLASSPATH, then you should add it like this:

c:>java -classpath "<myApp path>;<packages myApp needs>" myApp


> But it runs well before,and in JB4 IDE,it runs as well.

Of coure, it will - JB IDE hides all this classpath stuff from you - that's
a part of the beauty working with an IDE.

Regards,
Stefan