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From: Martin Gregorie <martin@address-in-sig.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: Command-line options in a jar file
Date: Sat, 21 Apr 2012 21:21:07 +0000 (UTC)
Organization: UK Free Software Network
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On Sat, 21 Apr 2012 15:11:14 -0400, Hiram Hunt wrote:

> Is there a way to pass command-line options to java.exe with an
> executable jar file?  The "Jar tool reference page for Windows" seems to
> say that the -J option should do it, but when I try it out, the option
> is sent to the java virtual machine when I run the jar command, not when
> I run the executable jar file.  I want to send -Xmxn and -Dthis=that
> options to java.exe.
>
Use the "Main-Class: full.class.name" directive in the jarfile's manifest 
to select the program to be executed and then run it with the command:

    java -jar jarfile_absolute_name arguments...

which passes the argument list to "static void main(String[] args) in 
full.class.name via args. If you need to pass options to the JVM, they 
are put in front of the -jar option.

If I want to be able to choose one candidate program out of several in 
the jar file, I use the Main-Class to run a simple launcher program and 
pass it the program name as its first argument. The launcher program uses 
Class.forName() to load the required program and then starts it by 
calling a method, which must not have the "static void main(String[])" 
signature. I typically use via a method with the "void run(String[] args)" 
signature and pass it all the command line arguments except the first via 
args.
  

-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |