<@UBME5M9U2> sounds like a mismatch. assuming you...
# tornadofx
c
@Kimberly H sounds like a mismatch. assuming your 8 JDK is in C:\jdk_1.8.0_172, run this
set JAVA_HOME=C:\jdk1.8.0_172
set PATH=%JAVA_HOME%\bin;%PATH%
cd to ScenicView folder
java -jar ScenicView.jar