windows

SCALA_HOME
C:\Program Files (x86)\scala

JAVA_HOME
C:\Program Files\Java\jdk1.8.0_25

M2_HOME
E:\maven\apache-maven-3.3.9

GRADLE_HOME
D:\Program Files\gradle-4.2.1

Path
%JAVA_HOME%\bin;%JAVA_HOME%\jre\bin;%M2_HOME%\bin;%SCALA_HOME%\bin;%SCALA_HOME%\jre\bin;%GRADLE_HOME%\bin;

CLASSPATH
.;%JAVA_HOME%\lib;%JAVA_HOME%\lib\tools.jar;%SCALA_HOME%\bin;%SCALA_HOME%\lib\dt.jar;%SCALA_HOME%\lib\tools.jar;