JAVA_HOME should point to a JDK not a JRE
C:\Users>echo %PROGRAMFILES%
C:\Program Files
C:\Program Files>set JAVA_HOME=%PROGRAMFILES%\Java\jdk-11.0.2
C:\Program Files>echo %JAVA_HOME%
C:\Program Files\Java\jdk-11.0.2
C:\Program Files>mvn -version
Apache Maven 3.6.2 (40f52333136460af0dc0d7232c0dc0bcf0d9e117; 2019-08-27T17:06:16+02:00)
Maven home: C:\apache-maven-3.6.2\bin\..
Java version: 11.0.2, vendor: Oracle Corporation, runtime: C:\Program Files\Java\jdk-11.0.2
Default locale: en_US, platform encoding: Cp1252
OS name: "windows 10", version: "10.0", arch: "amd64", family: "windows"