Spring Boot application fails to run - spring.resources.cache-period were left unbound

Just as @Stephane Nicoll suggested, I've changed spring-boot-devtools version to the one corresponding my Spring Boot version. This, along with deletion of previously provided spring.resources.cache-period property solved the issue.

I had the same problem. You should remove the version to use spring-boot same version

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>