Eclipse No tests found using JUnit 5 caused by NoClassDefFoundError for LauncherFactory

Question

The problem

Whenever I run my projects JUnit test (using JUnit 5 with Java 9 and Eclipse Oxygen 1.a) I encounter the problem that eclipse can\'t find any tests.

Answer 1

From the start the error message tell you that class is not found : NoClassDefFoundError that mean the PATH to junit is the problem.

1. Press right click to project folder and choose Properties OR select project folder and press combination cmd + i.

2. select from list "Java Build Path".

3. select "Libraries" tab
4. If JUnit 5(or JUnit 4) is added to "Modulepath", select the "JUnit 5" and press Remove.
5. select "Classpath", press "Add Library...".
6. from opened "Add Library" window, select JUnit, press next.
7. Select JUnit library version that you need and press Finish.

That is all. Try to run test again.