"NoClassDefFoundError" when running .jar file with cmd

Question

So I have two files to compile into jar file: Testfield.class (which i make from Testfield.java via javac command) and manifest.txt.

Now I'm getting this noclassdeffounderror when im running my jar file in cmd it goes as follows:

Exception in thread "main" java.lang.noclassdeffounderror: Testfield (wrong name: testfield/Testfield)

What's the deal ?

edit* Testfield.class file contains the following line:

Main-Class: Testfield

A manifest’s `Main-Class` attribute contains a *class name,* not a file name. It must not contain “.class”. — VGR, Jan 04 '19 at 15:47
Please edit your question and include the code for the Testfield class. — VGR, Jan 04 '19 at 16:07

Balint · Answer 1 · 2019-01-04T15:43:36.407

0

The NoClassDefFoundError indicates that the classloader (in this case java.net.URLClassLoader), which is responsible for dynamically loading classes, cannot find the .class file for the class that you're trying to use can you post your manifest?

You can also try to run javac in -verbose

edited Jan 04 '19 at 15:43

answered Jan 04 '19 at 15:41

Balint

295
2
11

you can also try to run javac in -verbose – Balint Jan 04 '19 at 15:44
it throws "Class names, Testfield.jar, are only accepted if annotation processing is explicitly requested" – Dominykas Zakrys Jan 04 '19 at 15:48
https://stackoverflow.com/questions/5063266/javac-error-class-names-are-only-accepted-if-annotation-processing-is-explicitl – Balint Jan 04 '19 at 16:14

"NoClassDefFoundError" when running .jar file with cmd

1 Answers1