Re: How to specify the main() class in "jar -cfe ..." ?

Knute Johnson <>
Wed, 31 Mar 2010 17:36:13 -0700
On 3/31/2010 12:14 PM, jaap wrote:

Op 31-03-10 10:14, schreef Raymond Schanks:

Assume I want to create a jar archive with a command

jar -cfe myjar.jar <MainApp> *.class

for some classes. The entrypoint should be the main() method in class

What do I have to specify for <MainApp> in the command above?

Do I have to write:

jar -cfe myjar.jar main *.class


jar -cfe myjar.jar MyTestclass123 *.class

What if the main() class is the only main() method in all classes. Can
I omit it then and write simply

jar -cf myjar.jar *.class



jar -cf myjar.jar *
Then you can start your program with:
java -cp myjar.jar MyTestclass123

If you want to start your program with:
java -jar myjar.jar

you have to add the following option in the META-INF/MANIFEST file:
Main-Class: Mytestclass123

according to the jar --help information you can provide your own
manifestfile with the option -m FILE


I like Jaap's answer the best with the addition that you may have many
classes with a main() method in them in the same .jar file and you can
specify which to run with the method above. I use the same technique
with some demo applets on my website. One jar contains several demo


Knute Johnson
email s/nospam/knute2010/

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