Q:

Command line error while building jenetics library

I'm attempting to build the Java jenetics library for genetic algorithms as per this website.
However, as can be seen in the image below I'm having some issues that I'm not able to resolve.

Am I missing something from the instructions or have I done something else weird?
Furthermore, I want to be able to use this library via Eclipse, so any hints as to how to achieve that would also be welcome, just in case what seems like a straight forward explanation on the website should not work.

A:

Your command line show a doubled C:\PROGRA~1\jenetics-3.6.0 string at the beginning. But even without this error, the given line is not the appropriate build command. 
Jenetics uses Gradle as build system. Calling Gradle wrapper script .\gradlew jar should build the jar file(s).

