jar -J option

[Brian Fryer]

According to the Oracle jar documentation, jar can pass JVM options with a -J option after the files list. However, when I try this, jar seems to interpret it as a file in the list and returns no such file or directory.

Also, jar usage does not show the option:

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

I am running

java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
Java HotSpot(TM) Client VM (build 19.1-b02, mixed mode, sharing)

Is this option no longer available?

[John Jai]

When I tried to specify using -j option, it gave me an error. Try like below and let us know if this is the way to use it..

-J option is given at the last...

C:\test>jar -cmf Manifest.txt MyJar.jar com/Hello.class -J-Xmx2M
Error occurred during initialization of VM
Incompatible minimum and maximum heap sizes specified

[Brian Fryer]

Here is what I entered:

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

Y:\>c:

C:\>cd test

C:\test>dir
 Volume in drive C has no label.
 Volume Serial Number is BC0F-EE02

 Directory of C:\test

10/25/2011  10:47 AM    <DIR>          .
10/25/2011  10:47 AM    <DIR>          ..
07/08/2011  09:08 AM             1,244 web.xml
               1 File(s)          1,244 bytes
               2 Dir(s)  32,817,487,872 bytes free

C:\test>jar -cvf MyJar.jar web.xml -J-Xmx2m
-J-Xmx2m: no such file or directory
security properties not found. using defaults.
adding: web.xml (in=1244) (out=404) (deflated 67%)

C:\test>jar -cvf MyJar.jar web.xml -J-Xmx2M
-J-Xmx2M: no such file or directory
security properties not found. using defaults.
adding: web.xml (in=1244) (out=404) (deflated 67%)