clean:
   [delete] Deleting directory E:\Cube\pre-build

check:

dirs:
    [mkdir] Created dir: E:\Cube\pre-build
    [mkdir] Created dir: E:\Cube\pre-build\assets
    [mkdir] Created dir: E:\Cube\pre-build\classes
    [mkdir] Created dir: E:\Cube\pre-build\producer
    [mkdir] Created dir: E:\Cube\pre-build\res
    [mkdir] Created dir: E:\Cube\pre-build\libs

compile-producer:
    [javac] C:\AMPASIDE\bin\tools\android\build.Cube.xml:143: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds

BUILD FAILED
C:\AMPASIDE\bin\tools\android\build.Cube.xml:143: Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK.
It is currently set to "C:\Program Files\Java\jre-9.0.4"

Total time: 2 seconds