Maven项目build时出现No compiler is provided in this environment. Perhaps you are running on a JRE rather

maven build时出现：

No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?

这是没有配置成jdk目录, Eclipse–>Window–>preferences–>Java–>Installed JREs，选择jdk，并查看jdk路径是否对，如图：

然后，Eclipse–>Window–>preferences–>Java–>Installed JREs–>Execution Environments，选择对应jdk，如图：

重新build即可。