问题：
IntelliJ IDEA 使用Maven构建项目报错 -Dmaven.multiModuleProjectDirectory system propery is not set. Check $M2_HOME environment variable and mvn script match.[ERROR] Maven execution terminated abnormally (exit code 1)
解决办法：
依次打开以下菜单项：Preferences... > Build,Execution,Developyment > Build Tools > Maven > Runner
然后在VM Options中添加如下配置：-Dmaven.multiModuleProjectDirectory=$M2_HOME
