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Asked: 2026-05-27T23:07:04+00:00

i’m trying to export my Java Project into a runnable JAR file with eclipse

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i’m trying to export my Java Project into a runnable JAR file with eclipse but if i want to run the finished JAR file I always get the error

Java Virtual Machine Launcher

Could not find the main class: src.main. Program will exit.

src.main is my main class, if i open the jar with winrar this class is in the folder src in the jar file.

I export the Project like this:

  • Right click on the Project name
  • Export
  • Runnable JAR file -> Next
  • Launchconfig: my main class.
  • destination: …\Desktop\asdf.jar
  • Library handling: Extract required libraries into generated JAR (I also tried all the others)
  • Finish
  • I get a Warning: “JAR export finished with warnings. ..”
  • OK

The libraries are added like this:

  • Right click on the Project name
  • Properties
  • Java Build Path
  • Libraries
  • Add External JARs
  • And than all the libraries are together in one external folder.

What am I doing wrong?

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1 Answer

  1. Editorial Team

    Does src.Start have a proper “public static void main(String[] args)” method?

    Are you trying to start the app like this:

    “java -jar myjar.jar” or “java -cp myjar.jar src.start”

    Also, are you building the manifest by hand, or letting eclipse do it? I don’t remember ever seeing eclipse add a classpath entry in the manifest but I might have missed it.

    On the “Jar Manifest Specification” panel during the export, just select “generate the manifest file” and fill in the “Main class:” entry in the input field.

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