Trying to run a .jar file but CAN'T!!!!

I have a .jar file. If I click on it, a Java Virtual Machine Launcher error box comes up that says "Could not find the main class. Program will exit."
I've tried to run it from the DOS prompt two ways.
If I type "java -jar Plist" (Plist is the .jar file name, the .java file name, and the class name), It says...
Exception in thread "main" java.util.zip.ZipException: The system cannot find
e file specified
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(Unknown Source)
at java.util.jar.JarFile.<init>(Unknown Source)
at java.util.jar.JarFile.<init>(Unknown Source)
If I type "java -jar Plist.jar", It says...
Exception in thread "main" java.lang.NoClassDefFoundError: Plist
Two questions...
1. What am I doing wrong??
2. Once I get this .jar deal to work, will I be able to run it on other computers? It seems to be tied in with some of the Java utilities and files on my computer. Is it independent like a .exe file or not?

1. What am I doing wrong??
You need a manifest. Open notepad and write these two lines:
Main-Class: main
[A blank line, just hit enter]
For main specify the name of the class that has the Main(String[] args) method without the .class extension. If your using a package, then put the package name in there too like this:
Main-Class: myPackage/main
But since you not using a package, and you said the only class is Plist.class then use:
Main-Class: Plist
(remember a blank line here)
Now save this file (call it manifest.txt if you like).
Next, update your jar file with this command:
jar umf [name of manifest file] [name of jar file]
jar umf manifest.txt Plist.jarNow run with this command or double-click from Windoze:
java -jar Plist.jar2. Once I get this .jar deal to work, will I be able to run it on other computers?
The other computers must have at least the jre installed, available free from Sun as you know :)
-Ron

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