配置maven报错 the java_home environment variable is not defined correctly ......

   the java_home environment variable is not defined correctly

   This environment variable is needed to run this program

   NB: java_home should point to a jdk not a jre 

如图，报以上错误。感觉自己配置没问题，一直找不到原因。原来这里加个反斜杠