Export project as jar file using manifest

Question

I just wrote Java console project , which i shoud pack as jar file. I googled it alot and found different solutions like (Eclipse) Project -> New Configuration -> e.t.c Then export as jar file using speciefied config. That's nice, but it's not what i need. After making repeatedly - it won't work. I tried to do same as mentioned here: click

Second Solution: create jar using manifest. Well it's much better, because i can specifiy entry point of main.class. But it's won't work due to can;t find out where's annother packages.

Upd: Launcher.class looks like this

package backpack.dao;

public class Launcher{
    public static void main(String[] args){
    Backpack.start();
}
}

My project structure:

src/backpack/dao/Item.java
                /Backpack.java
                /Chromo.java
src/backpack/main/launcher/Launcher.java

The Question is: What should i write in manifest instead of this:

Main-Class src/backpack/main/launcher/Launcher to make executable jar successfully?

P.S Launcher class uses instances from Backpack.java Please don't downgrade. I'm rookie

Thanks

baza92 · Accepted Answer · 2015-04-15T21:12:25.637

What is the package of the Launcher.java? Have you included package name to the classname in manifest.txt? Remember, when Launcher.java is in package "backpack.main.launcher" your classname in manifest.txt will be:

Main-Class src/backpack.main.launcher.Launcher

instead of:

Main-Class src/backpack/main/launcher/Launcher

Also, remember about this:

The text file must end with a new line or carriage return.

To check what exactly is wrong with your jar file run it in the command line using:

java -jar MyJar.jar

and paste here output with error message.

For more help you can check this example from Oracle: link

Edit:

I recreated your project structure and I have found the solution (at least I think I have :) )

Compile your code and go to the parent directory with compiled code (with *.class files, this should be "out" directory or something like this - depending from your IDE). For example: when your project is in some/path/src/backpack/main/launcher go to src directory.
Run command: jar cvfe MyJar.jar backpack.main.launcher.Launcher -C . . (Yes, two dots at the end)

This should create jar with name MyJar.jar and manifest file (-e flag) with main class backpack.main.launcher.Launcher. -C flag include all *.class files recursively from directory . (current one), so both from dao and launcher package.

Test jar: java -jar MyJar.jar

Thanks for the answer, this isn't a good solution. because at launcher.class i invoke method of annother class. This class locates at annother location. so after creating jar via cli ( i receive error 2: 'can't see backpack.dao package'). — Malakai, Apr 12 '15 at 18:07
I'm a little bit confused about structure of your project: 1. What is package of Item.java, Backpack.java and Chromo.java? 2. According to structure of your project how it is possible that Launcher.java is in package `backpack.dao`? It should be in `backpack.main.launcher` package. Does your project compile? 3. Why do you need to insert Launcher.java in separate directory? — baza92, Apr 12 '15 at 20:46
Hello. Yes, I double checked project. So I'm glad to answer to your questions: 1. All three classes belong to `backpack.dao` package. 2. Simply, I invoke static method run from Backpack.class. No, Launcher already is on `backpack.main.launcher` package 3. Yes. I know it's lil' bit weird why I run program like this, but it prevents me from messing in the code ;) P.S project compiles and run succesfully. The Only thing i need is to pack it as WAR file. — Malakai, Apr 15 '15 at 09:50

Export project as jar file using manifest

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