IDEA Cannot resolve directory '$'{'JAVA_HOME}'

用idea新建一个maven项目，演示hdfs客户端操作。导入依赖之后，发现有一处标红:

		
            jdk.tools
            jdk.tools
            1.8
            system
            ${JAVA_HOME}/lib/tools.jar
        

显示：cannot resolve directory ${JAVA_HOME/lib/tools.jar}

systemPath换成如下即可

		
            jdk.tools
            jdk.tools
            1.8
            system
            ${java.home}/../lib/tools.jar