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

None of the solutions helped:

The problem is that Eclipse 2018-12 has support for JUnit 5.3.1. If you start it with a version before that, it will fail.

So make sure you use at least 5.3.1.

5.4.0 does work too.

In case your parent pom is Spring Boot, you need to make sure (in dependency management) that junit-jupiter-api is set to the same version. You don't need junit-platform-runner or -launcher!