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Editorial Team
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Asked: 2026-06-14T01:01:28+00:00

I have recently developed some java applications that i want others to run on

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I have recently developed some java applications that i want others to run on their machines.
I did some research and now know that to distribute java code you need to create .jar file.
Well i did that, but when I am distributed those file it runs on some computers but on others it return an error saying: “Main class could not found”.

  1. Is there any problem with JRE version.
  2. How would a user know that on which version he/she should run the application.
  3. can i package the correct jre version with my app/jar file. how??
  4. Are jar files not compatible with other version of jre except in which they are compiled.
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1 Answer

  1. Editorial Team

    Option1: Create a manifest file with entry as below and include in the jar:

         Main-Class: MainProgram

    Option2: Just mention your Main class name while running the program e.g. if you jar name is myprogram.jar and main class is MainProgram then run the program as below:

            java -cp myprogram.jar MainProgram

    If your MainProgram takes some arguments, them pass them as well in the command line e.g. 

           java -cp myprogram.jar MainProgram argument1 argument2
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