spring boot 引入 oauth2.0 后报错：
implementation 'org.springframework.security.oauth:spring-security-oauth2'
eclipse报错：
Could not resolve: org.springframework.security.oauth:spring-security-oauth2
idea报错：
Unable to resolve org.springframework.security.oauth:spring-security-oauth2
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解决方法，增加版本号：2.2.0.RC1
implementation 'org.springframework.security.oauth:spring-security-oauth2:2.2.0.RC1'
其他版本号可参考maven仓库
https://mvnrepository.com/artifact/org.springframework.security.oauth/spring-security-oauth2
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