Individual File update in jar fails

Question

I am following question to update a file content inside the jar And run following command

jar tvf <jarfileName>

and then

jar xvf <FullFilePath>

and at last

jar vuf <FolderName>/

So what exactly happening here , in jar i have structure like this

Foo.jar (root directory)
/
|->/folder1
|
|->/folder2
|
|->/foo
    |
    |-->/bar
         |
         |---->/baz
               |
               |------>file1
               |------>file2
               |------>file3
               |------>file..N

After running above commands ,jar folder Structure change like this

Foo.jar (root directory)
/
|
|->/foo
    |
    |-->/bar
         |
         |---->/baz
               |
               |------>file1

It is deleting everything and update with only file and folder structure which was extracted.

I doubt that `jar vuf /` does anything useful when not even the jar file name has been given. For questions like this, exactness is important. — Holger, Jan 20 '22 at 08:19

score 0 · Answer 1 · edited Jan 20 '22 at 15:41

0

In case you are not limited to using jar command only, I would offer as one of the solutions to use any zip utils because jar file is a plain old zip archive.

You can unpack it to the folder, replace all required files and pack it back again.

You can do it with internal java zip support or use other tools to work with zip files from java like zip4jvm.

P.S. zip4jvm is written by me

edited Jan 20 '22 at 15:41

Subodh Joshi

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answered Jan 20 '22 at 12:38

Oleg Cherednik

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Individual File update in jar fails

1 Answers1