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But the GUI.class have to be in a sendmail folder because of the package declaration at the top in your code or it wont work anyways.

Could you try attaching the files here and I will try to...

Try altering your main-class to this.



// Json

When you specify Main-Class: GUI it means that java will try to locate a class file GUI.class in the root of the jar file. This needs to be the fully qualified package/class name of the class...

See Adding Classes to the JAR File's Classpath (The Java™ Tutorials > Deployment > Packaging Programs in JAR Files)

At the bottom of that page you can see that you can specify a classpath entry in...

Hello, either you can shadow the mail.jar into your programs jar as in deflate it and pack the contents into your jar or you can simply make sure your classpath is correct in the manifest file and...