Create a jar file using compiled class files and an existing MANIFEST.MF file

Question

Is it possible to take existing .class files and a MANIFEST.MF to create a jar file?

Is there a library that can create a "valid" jar-file? I tried it manually and it didn't work (using 7zip). ERROR: "Invalid or corrupt jar file"

If everything has been compiled before, it should (in my understanding) theoretically work, if you create a new zip file, put all the files in it in the original structure and then rename it to "jar".

My idea is to program something like this with java code. A solution where I could add a file to an existing jar, would also be ok.

If you're interested in why I want to use this, look at my initial question: Compile javacode out of a running java accpilaction - on a system that hasn't JDK installed

Have you tried using `jar` command that is distributed with the JDK? http://docs.oracle.com/javase/tutorial/deployment/jar/ — Peter Svensson, Mar 16 '14 at 22:10
@PeterLiljenberg: I have to calculate with computers that just will have jre installed. :) — codepleb, Mar 16 '14 at 22:13
So what can we expect from the computers OS? Linux? osX? Windows? — Peter Svensson, Mar 16 '14 at 22:15
It is possible if you have no special options in your Zipper. You must not use the 7z format. Use simple ZIP. The manifest belongs in the META-INF directory. — wumpz, Mar 16 '14 at 22:23
http://stackoverflow.com/questions/2977663/java-code-to-create-a-jar-file — Peter Svensson, Mar 16 '14 at 22:24
@PeterLiljenberg: It should be as platform independent as possible. :) But it'll be windows, if other OS' would be involved, I have to look for other options. But important is, that it will run on windows. — codepleb, Mar 16 '14 at 22:30

score 0 · Answer 1 · answered Mar 16 '14 at 22:14

0

Well Jar -cf

Try the jar command in $JAVA_HOME/bin

$JAVA_HOME is the path to you JRE/JDK installation

answered Mar 16 '14 at 22:14

Puru--

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Create a jar file using compiled class files and an existing MANIFEST.MF file

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