Program run in Netbeans but NOT running as jar file

Question

Dear all ,
i hope any help in this problem.
i am writing program to access parallel port i put next files :
1. [ comm.jar + javax.comm.properties ] in
[ C:\Program Files\Java\jdk1.6.0_18\lib ] and [ C:\Program Files\Java\jdk1.6.0_18\jre\lib ]
2. [ win32com.dll ] in [ C:\WINDOWS\system32 ]
when i run application in NetBeans IDE 6.8 work fine and every think is ok
BUT when i produce jar file , generated jar file does not work [GUI appear but can not get ports on PC]
- I try to set Environment Variable as next :
CLASSPATH = .;C:\Program Files\Java\jdk1.6.0_18\lib\comm.jar
also does not work
any tip please ?
Thanks in advance
Nabil

Answer 1

First of all, leave the lib and jre/lib directories of the JRE alone. Never ever touch them again. Remove any jars you have put there yourself, or better yet completely remove and reinstall the JRE to make sure you put it back in a correct state.
After you do that, learn how to properly work with the classpath in both the IDE and the command line.
Netbeans: you define the classpath by adding jars to the project (right click on the libraries node in the project tree to get the appropriate options).
Command line: this depends on if you run a single class, or you invoke an executable jar.
Single class: you use the -cp command line switch to define the classpath
Executable jar: the jar itself defines the classpath in its META-INF/manifest.mf file. The -cp command line switch is ignored.
Since you use Netbeans, you'll get an executable jar so make sure to learn how such a jar is structured.