Cannot resolve plugin org.springframework.boot:spring-boot-maven-plugin:<unknown>

Cannot resolve plugin org.springframework.boot:spring-boot-maven-plugin:<unknown>
spring-boot-maven-plugin
https://www.jb51.net/article/199296.htm
https://www.freesion.com/article/64131067513/
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-maven-plugin -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
    <version>2.5.0</version>
</dependency>

Dependency 'de.codecentric:spring-boot-admin-starter-client:2.3.1' not found
https://www.cnblogs.com/yeyuzhu/p/13353147.html

idea inspections

Cannot resolve plugin org.springframework.boot:spring-boot-maven-plugin:<unknown>spring-boot-maven-pluginhttps://www.jb51.net/article/199296.htmhttps://www.freesion.com/article/64131067513/<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-maven-plugin --><dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-maven-plugin</artifactId>    <version>2.5.0</version></dependency>
Dependency 'de.codecentric:spring-boot-admin-starter-client:2.3.1' not foundhttps://www.cnblogs.com/yeyuzhu/p/13353147.html
idea inspections