How to install Chemistry development kit after installing apache maven 3.6.3

Hello,
I have java , java development kit 32 bit and 64 bit installed on my laptop. I have installed apache maven 3.6.3 and its path is C: \Program Files\apache-maven-3.6.3. I have downloaded chemistry development kit cdk-2.0.jar and it is Program Files directory.

On my laptop, JAVA_HOME environment variable is set to C:\Program Files\Java\jdk-15.0.1. But at the time of installation of cdk-2.0.jar by giving command mvn install at the command prompt, following screen appears.

How to overcome this difficulty?

Are you trying to use cdk in your project? Or are you trying to execute cdk? Or _________?

There’s “Getting started” info for cdk here: https://cdk.github.io/ and here: GitHub - cdk/cdk: The Chemistry Development Kit