JUnit: NoClassDefFoundError: org/junit/runner/manipulation/Filter

Stackoverflow解答： 

1. Right click the project in Package Explorer, and click Properties.
2. Click the Libraries tab.
3. Click the Add library button.
4. Select JUnit and click Next.
5. Select JUnit 4 (that's what I am using).
6. Click finish.
7. Now right click the file containing unit tests and select Properties.
8. Under the Run/Debug settings, remove any entries from the Launch Configurations for that file. Hit ok.

一般情况下，无需配置Junit，remove即可。