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Editorial Team
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Asked: 2026-06-18T18:16:33+00:00

Ok, I have this file I use for debugging purposes while I’m writing some

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Ok, I have this file I use for debugging purposes while I’m writing some code. However, I am looking to speed up the process by packing it in an executable .jar file. I have been creating a jar file via eclipse, and attempting to run it as is.

The contents of the jar (Derivitave Quiz.jar) are as follows:

  • DerivQuiz.java
  • DerivQuiz.class
  • Meta-INF (empty folder)
  • pass.txt

Also, would I have to re-write it to use a non-command line output, such as Jpane/JOptionPane, instead of System.out.print()?

My current code works fine in Eclipse, but not after porting to a jar.

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  1. Editorial Team

    I did have to change all my print statements to use JOptionPane.showMessageDialog() instead of System.out.print().

    Upon further inspection, the jar was being created without a manifest file, not allowing the jar to run.

    I fixed this by adding a manifest file under META-INF/manifest.xml, with the following code:

    Manifest-Version: 1.0
Created-By: 1.6.0_27 (Sun Microsystems Inc.)
Main-Class: MCExploit

    Adding this allows the jar to run flawlessly, in addition to the other adjustments I made.

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