How to create jar file | easy way of .jar from .java files

One fine day I was just skimming through files and thinking of how we can create jar files that contains the package and that jar is inserted into big java project and used the classes from that files there, You might have think what’s great deal just searched and find so many ways nothing seems to be perfect and contain all the details

java to jar

Steps

1. lets have folder that contain all java files required for which we want one jar file, Lets have a look on image below

Folder and simple java file

Here point to note is we have package mypkg which inmost cases you also have for larger project for which you are making jar

2. Now lets compile java program that has package so we will keep .class generated from it into that package / folder using

javac -d mypkg One.java

3. now let create a manifest.mf file like following which contains the name of your class which contains main method that is your entry point make sure here to give class name with package name shown in image below, Keep in mind to write it like this after: there is space and one extra new line at end of file

Main-Class: One.java

Manifest file

4. Now most important part is to create jar file using cmd this command ship from jdk no need to add any other library

jar -cvmf manifest.mf one.jar mypkg/*.class

options explanantion of jar command

5. finally test the jar that you have created is correct or not

java -jar one.jar

If everything is correct it will start running program from entry point of main method psvm()😅

If not able to run program just read through article again and carefully watch on screenshots . I know you will definitely able to make.

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