Maven框SocialConfigurerAdapter.class缺失

 1.配置如下图所示环境配置 如果出现：No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK时使用2.没有可适当忽略2和3.  2、eclipse菜单 - Window - Preferences- Java - Installed JREs 将配置的JRE定位

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