Spring Boot application can't resolve the org.springframework.boot package

Question

I have set up a spring boot project using the Spring Initializer, I tried several times to create a new project or play with the dependencies, everything seems to be in plac

Answer 1

After upgrading Spring boot to the latest version - 2.3.3.RELEASE. I also got this error - Cannot resolve org.springframework.boot:spring-boot-starter-test:unknown. Maven clean install, updating maven project, cleaning cache do not help.
The solution was adding version placeholder from spring boot parent pom:

 
   org.springframework.boot
   spring-boot-starter-test
   ${spring-boot.version}
   test