Compressing an Extracted Jar File

Question

I have extracted a jar file and made some change on it. Now, how can i compress again it as an executable jar file?

Thanks.(Sorry for my bad english.)

Sidedress

Hopefully this answer be of some help on the topic :-) – Piet

Answer 1

Try :

jar cf jar-file input-file(s)

according to http://docs.oracle.com/javase/tutorial/deployment/jar/build.html

Illfounded

When I want to execute the resulting jar file I get the error: no main manifest attribute, – Sinkhole

I used this command to compress folder into jar: jar cf fileName.jar FOLDER_NAME/ – Hoodoo

Answer 2

By Using Eclipse IDE You can Create your jar file

Below i have one link from which you can learn how to make jar file executable

https://www.cs.utexas.edu/~scottm/cs307/handouts/Eclipse%20Help/jarInEclipse.htm

But For that You have to make project in Eclipse.

Thimerosal

It's not a eclipse project. It's jrupy-complete.jar file and it contains different subfolders and meta-inf folder. – Sidedress

than you have to convert into project than make changes as per your requirenmnt and generate jar – Thimerosal

Answer 3

You can use this very simple library to pack/unpack jar file programmaticaly

JarManager

Very simple

import java.io.File;
import java.util.List;

import fr.stevecohen.jarmanager.JarUnpacker;

class Test {
   JarUnpacker jarUnpacker = new JarUnpacker(); 
   File myfile = new File("./myfile.jar");
   File unpackDir = new File("./mydir");

   List<File> unpacked_files = jarUnpacker.unpack(myfile.getAbsolutePath(), unpackDir.getAbsolutePath());
}

You can also use maven dependency

<dependency>
    <groupId>fr.stevecohen.jarmanager</groupId>
    <artifactId>JarManager</artifactId>
    <version>0.5.0</version>
</dependency>

Check the last version with the link bellow to use the last dependency

Please use my public issue tracker if you find some bugs

Monetmoneta

Answer 4

jar cvf filename.jar *

• To compress all extracted file to single jar file you can use *
• To add single file you also can use filename instead of *

https://docs.oracle.com/javase/tutorial/deployment/jar/appman.html

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