Modifying existing jar file, how?

Hi there,
I have a problem trying to modify an existing jar file. When I want to create a jar file, I use something like:
REM build the application on windows, assuming the java/bin
REM directory is in the path environment variable
REM application is just the directory I am using
SET cp = c:\application\TestApp
javac -classpath %cp% TestApp.java
REM ****************************************
REM do packaging and adding manifest
REM ****************************************
jar cvfm App.jar manifest.mf TestApp*.class
REM ****************************************
REM run the jar file
REM ****************************************
javaw -jar App.jar
But now, I have an existing jar file (swingall.jar) and I want to modify a class within that file. So, I modified the .java file, and compiled it to get my new class file.
And the question is, how do I modify the existing file, so that I keep everything the same, except the modified class?
Thanks
Fernando

I have just found out that I can't use "u". It seemsthat's only
possible with older versions of jar.Huh? I'm using the 1.4.2-b28 jdk, it's still there,
and I don't see how it could ever possibly be
removed.
Type:
jar
with no arguments to see all the options to jar.I already did, to double check it, and this is what I got:
C:\Documents and Settings\Fernando Sanz>jar
Usage: jar {ctx}[vfm0M] [jar-file] [manifest-file] files ...
Options:
-c create new archive
-t list table of contents for archive
-x extract named (or all) files from archive
-v generate verbose output on standard error
-f specify archive file name
-m include manifest information from specified manifest file
-0 store only; use no ZIP compression
-M Do not create a manifest file for the entries
If any file is a directory then it is processed recursively.
The manifest file name and the archive file name needs to be specified
in the same order the 'm' and 'f' flags are specified.
Example: to archive two class files into an archive called classes.jar:
jar cvf classes.jar Foo.class Bar.class
Note: use the '0' option to create a jar file that can be put in your CLASSPATH
Thanks for trying with jdk 1.4, I don't have it installed in my computer right now, so I'll try tomorrow with another computer at Uni.
Thanks!

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