Junit 5 tests don't launch in Eclipse due to NoClassDefFoundError: TestEngine
问题 (There was no question for this problem in stackoverflow, so I decided to share question & solution here.) I wanted to migrate my Spring Boot project from JUnit 4 to JUnit 5, so I added the new API as dependency and removed the old the ones: <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>junit</groupId> <artifactId>junit</artifactId> </exclusion> </exclusions> </dependency>