Which version of vRO do you have installed? Could you provide more information about the errors/issues with the archetypes?
Also, could you provide a link to the development guide you are using?
It fails on the mvn generate:archetpye command, it says it's not supported anymore (I can post the full logs later when I get back to home).
I'm using the same docs AlessandroRomeo68 attached and still lost. The documentation doesn't have a starting guide (altho I'm not an experienced Java developer since I mainly code in C#/JS I stil think it's missing some information such as how to setup the Environment and maybe some examples).
Is there any working example plugin for the 7.X version? I found the SolarSystem plugin but still didnt made it work.
The command may fail for several reasons. Check, for example, the thread https://communities.vmware.com/thread/624622 where I provided some info how to resolve them, or what to check for additional troubleshooting.
SolarSystem plug-in dates back to good old vCO 4.x days. It might be hard to compile it with the current tooling. There are several open source plug-ins on Github which you can look at, although they are not documented and are not intended to be used as a reference implementation. Here are some of them:
Those examples works on vRo 7.X without major changes to compile? If so thats an excellent start point and will def. take a look
Not sure about the Powershell plug-in, but I'd expect the other 3 plug-ins to be fully compatible with vRO 7.
Let me know if you have problems compiling them.