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.

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