Spring Boot ClassNotFoundException org.springframework.core.metrics.ApplicationStartup
I was able to solve this by downgrading Spring Boot: <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <version>2.3.3.RELEASE</version> </dependency> Guess it’s just not compatible with 2.4.0 yet. Specifically I also had to ensure that I used 2.3.3.RELEASE and not anything more recent due to other issues I ran across.