Maven构建项目报No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK? 问题的解决方案
在编译SSM项目时，碰到如下问题，希望能给遇到相同问题的小伙伴们帮助 O(∩_∩)O~
Eclipse导入Maven项目后，选中父项目，执行Run AS——>Maven install后，出现如下错误：
说的是执行编译失败，你是不是在JRE环境下运行而不是JDK？想了想，JDK已安装、各种环境变量配置木有问题，为什么会出现这种状况呢？寻思了一会儿，知道了原来Eclipse运行是需要一个JRE，而这个JRE并不是系统环境变量中的javac目录下的JRE，而是JDK安装时候自带的JRE目录，此目录下并无javac，故无法进行java的编译，问题找到了，下面说一下具体解决方案。
在Eclipse的菜单中，进入 Window > Preferences > Java > Installed JREs > Execution Environments，选择JavaSE-1.x, 在右侧选择JDK的安装目录（注意不要选择JRE的目录）.
配置好之后，选中项目，refresh(或F5)下，重新执行Maven install.本来以为就可以了，还是部分子模块还是报之前的错误。
分析了一下，Maven项目，多模块相互依赖，简单的F5还是不行的，直接Update Maven Project，记得勾选Force Update。
然后在执行Maven install后，这次可以执行成功了。
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