Is there a quick way to delete a file from a Jar / war without having to extract the jar and recreate it?
JavaLinuxJarJava Problem Overview
So I need to remove a file from a jar / war file. I was hoping there was something like "jar -d myjar.jar file_I_donot_need.txt"
But right now the only way I can see of doing this from my Linux command line (without using WinRAR/Winzip or linux equivalent) is to
- Do "jar -xvf" and extract the
complete Jar file - Remove the file(s) I don't need
- Rejar the jar file using "jar -cvf"
Please tell me there is a shorter way?
Java Solutions
Solution 1 - Java
zip -d file.jar unwanted_file.txt
jar is just a zip file after all. Definitely much faster than uncompressing/recompressing.
Solution 2 - Java
In Java you can copy all the entries of a jar except the one you want to delete. i.e. you have to make a copy but don't need to create the individual files.
You can do this by
- creating a new jar.
- iterating though the Jar you have
- copy the entry from one jar to the other, skipping any files you want.
- close and replace the orginal jar if you want.
Solution 3 - Java
In case you want to delete file in order to unsign signed jar, you can probably just make the .RSA file zero-sized. This can be accomplished with just jar u
. See https://stackoverflow.com/a/24678645/653539 . (Worked for me, though I admit it's hack.)
Solution 4 - Java
If you wish to do this programatically, can use the Zip File System to treat zip/jar files as a file system. This will allow you to edit, delete, and add files to the jar file.
See https://stackoverflow.com/questions/2223434/appending-files-to-a-zip-file-with-java