The handling of JAVACLASSPATH in the Java scanner by the _subst_libs function seems problematic. _subst_libs is a direct copy of the code in SCons/Scanner/Prog.py (down to the comments), where the ...

Docker must be installed on the same machine that the NeuVector Scanner APIs is running because these APIs will run "docker run" on the host machine. Ensure that you the folder "/var/neuvector" gets ...

That's saying that the java.util.Scanner constructor is marked as being able to throw the exception java.io.FileNotFoundException - you either need to wrap that in a try/catch or mark your function as ...