How can we create a multi-release jar (mrjar) using the jar tool in Java 9?

In Java 9, a new feature "Multi-version jar format" has been introduced in which different versions of Java classes can be used or maintainable resources to enhance the jar format and use it according to the platform. The jar command can be used to create a multi-version jar containing two versions of the same class compiled for Java 8 and >Java 9 Version comes with a warning message informing that the two classes are identical.

<strong>C:\Users\User\tutorialspoint>jar --create --file MR.jar -C sampleproject-base demo --release 9 -C sampleproject-9 demo
Warning: entry META-INF/versions/9/demo/SampleClass.class contains a class thatis identical to an entry already in the jar</strong>

" --release 9" option can tell the jar to include all the following content (the demo package in the "sampleproject-9" directory ) in "## Within the versioned entry of MRJAR under #root/META-INF/versions/9”.

<strong>jar root
   - demo
      - SampleClass.class
   - META-INF
      - versions
         - 9
            - demo
               - SampleClass.class</strong>

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