#Adding a jar file in eclipse - java.lang.NoClassDefFoundError

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short sapphireBOT
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Hey, @toxic beacon!
Please remember to /close this post once your question has been answered!

raw grail
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@toxic beacon Please do not share (links to) executable files.
Message (without link):

Hey, I try to add a jar file in eclipse, but I am getting the error: "java.lang.ClassNotFoundException" - so it's not working.
I am using Java Build Path->Libraries->Modulpath-> Add external jars.
I am doing something wrong? I always have done it like this, but now it's not working anymore

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and can you share the stack trace (ideally using a codeblock)