error: package com.sun.tools.javac.util does not exist

I got this problem when I try to build kotlin/jvm with gradle, I want to post this to others new to jvm, since jdk-9, there is no tools.jar. setting a classpath is good to go.

JAVA_HOME= path_to_jdk

JRE_HOME= path_to_jre

PATH= ;%JAVA_HOME%\bin;%JRE_HOME%\bin

CLASSPATH=.;%JAVA_HOME%\lib;%JRE_HOME%\lib

This class is found in tools.jar, which is not part of the JRE.