1

From https://dzone.com/articles/java-8-how-to-create-executable-fatjar-without-ide

tar xf ExecutableOne.jar

but why do I get

$ tar xf ExecutableOne.jar 
tar: This does not look like a tar archive
tar: Skipping to next header
tar: Exiting with failure status due to previous errors

Thanks.

  • 1
    Because jar files are not tar archives, and it's utterly bewildering to me that that article suggests they are. – Michael Homer Apr 11 at 20:35
  • 5
    This is probably a typo in the article, which really meant to say jar xf rather than tar xf. – dhag Apr 11 at 20:37
  • 3
    They are just zip files, though, so you can extract them with unzip too. – Michael Homer Apr 11 at 20:58
  • @MichaelHomer Can tar extract zip files? – Tim Apr 11 at 21:03
  • I wouldn’t be surprised if there were an implementation that could, but not usually. – Michael Homer Apr 11 at 21:13
4

A jar file is a Java ARchive, not a tarball that can be extracted. You can install jar or java and extract the files (or use 7-Zip), but you can't extract them with tar.

5

bsdtar (which is the regular tar(1) on FreeBSD, and easily installable on Linux) can extract .jars transparently, and a lot of other archive formats.

.jars are basically .zip files.

0

IF you are old enough to remember, it USED to work (at least on Solaris) just fine: you could use tar to enumerate and extract the contents of a .jar file. It was extremely handy for double checking for the presence of specific .class files on a target system, where you typically didn't have developer tools deployed.

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