How to include third party .jar files into my jar file

Hi,
how do i include a open source third party jar file into an executable jar?
i have a class called BlogBox.java and it uses org.apache.commons.net.ftp.FTPClient, i want to create an executable file, where do i put the .jar file containing FTPClient aka Apache Commons Net?
currently i'm getting the following error from when executing my BlogBox.jar
C:\MyJava\BlogBox>java -jar BlogBox.jar
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/net/ftp/FTPClient
at blogbox.BlogBox.<init>(BlogBox.java:27)
at blogbox.BlogBox.main(BlogBox.java:103)
Any suggestions? i have searched google and this forum but could not find the solution to my problem, thanks
[edited msg] do i need to add the classpath at execution or something of the apache commons net library?
Message was edited by:
gekkokid

When you use an executable jar the normal class path
is ignored, but you can put a classpath inside the
jar. The usual trick is to place the library jar
files in a directory inside the application directory
and direct the manifest file to it. The manifest file
live in the jar inside the META-INF directory and
it's called manifest.mf
The two heavilly used entries are Main-class: and
Class-path: lines. Class-path just has a
comma-separated list of library paths.
The jar utility has a special option to load it up.Thanks :) I created a "/lib" directory, placed in the packages in there and redirected the Class-Path: lib/commons-net-1.4.1.jar
and it works,
thank you everyone :)

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