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https://issues.apache.org/jira/browse/COMPRESS-682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17866972#comment-17866972
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Benjamin Marwell commented on COMPRESS-682:
-------------------------------------------

Here is one more. A file containing just "Hello, World!". compressed with gzip.
{code:java}
$ echo "Hello, World\!"  > hello_world.txt

$ xar --distribution --compression gzip -cf hello_world.xar hello_world.txt

$ file hello_world.xar
hello_world.xar: xar archive compressed TOC: 349, SHA-1 checksum, contains  
zlib compressed data

$ xar -tvf hello_world.xar
-rw-r--r--   unknown/unknown          14 1970-01-01 00:00:00 hello_world.txt 
{code}
If you want to see the attributes, someone else should create those files. 
Compression has been done on latest Mac Release.

> Support XAR archive format
> --------------------------
>
>                 Key: COMPRESS-682
>                 URL: https://issues.apache.org/jira/browse/COMPRESS-682
>             Project: Commons Compress
>          Issue Type: Improvement
>          Components: Archivers
>    Affects Versions: 1.26.2
>            Reporter: Andres Almiray
>            Priority: Major
>         Attachments: empty-file-uncompressed-no-compress.xar, 
> empty-file-uncompressed.xar, hello_world.xar
>
>
> The XAR archive format definition can be found at 
> [https://en.wikipedia.org/wiki/Xar_(archiver)]
>  
> There are a couple of Java based implementations but they seem to be no 
> longer maintained. Also, they have external dependencies that may no longer 
> be required if relying in JDK utility classes and facilities exposed by 
> commons-compress
>  
> [https://github.com/sprylab/xar] is ASL 2.0
> [https://github.com/gino0631/xar] is LGPL 3.0



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