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Editorial Team
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Asked: 2026-05-30T21:56:52+00:00

I’m using a .jar file which I imported to Eclipse, and when I used

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I’m using a .jar file which I imported to Eclipse, and when I used Eclipse to run the application is works just fine.

But when I try running it from the command line with just the command java ClassName I get a NoClassDefFoundError message.

The .jar file is in the same directory as the main class I need to run.

I tried using the classpath command in the terminal

java -classpath pack.jar ClassName

but I got the same error but this time it was in the main thread

Exception in thread "main" java.lang.NoClassDefFoundError

Why does my program work in Eclipse but not on its own?

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1 Answer

  1. Editorial Team

    I guess you’ll need to use: java -classpath .:pack.jar ClassName.

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