DigitalOcean: deploying war file fine, but no dependencies are downloaded

I have a VPS on DigitalOcean I try to deploy an app to. I have Tomcat and Maven installed there and I have copied the local .war file to /tomcat/webapps. After restart the .war gets unpackaged fine.

However, when I try to make use of some servlets I get javax.servlet.ServletException: java.lang.NoClassDefFoundError: org/json/JSONObject error, meaning that even though I have a pom.xml file with needed dependency:

 <!-- -->     <dependency>         <groupId>org.json</groupId>         <artifactId>json</artifactId>         <version>20180813</version>     </dependency> 

It wasn’t used during the deploy.

How should I proceed? Is there a way to download all dependencies using PuTTy?