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Asked: 2026-06-10T15:56:40+00:00

I am trying to run a simple java program in linux but getting a

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I am trying to run a simple java program in linux but getting a NoClassDeffoundError.

Basically, I have the following folder structure:

lib/myRef.jar
src/MyTest.java //there are classes that being referenced in myRef.jar

I compile like this:

javac -cp ../lib/myRef.jar MyTest.java //The class file is being gerenated in the same directory

Then when I try to run:

java -classpath . myRef

I am getting a NoClassDefFoundError on classes that I am referencing in the jar file.

Do I need to reference both lib and the current class that I am running?

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1 Answer

  1. Editorial Team

    Yes, you’ll need to also have myRef.jar on the classpath when running your code using java. Also, you seem to be passing the wrong classname to java, if you want to run your class MyTest as your main class, then use:

    java -classpath ../lib/myRef.jar:. MyTest

    Just compiling against the support classes that you use isn’t enough, they’ll also need to be in the classpath when you run your program.

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