Help making animals rideable

I was wondering if there is a way to make any mob rideable and be able to control them using spigot/bukkit in eclipse.
I've seen people riding and controlling the ender dragon and riding other animals using command blocks but is there a way to do this to all animals automatically when you load the world using eclipse. I tried to use the entity.getpassengers but 1. I don't know if this will even work and 2. it does not let me add an entity (player) to the passengers list.
If I can't use eclipse could I make my own mod?

 

You can execute commands from code. Why not do it that way?

 

@Tiger24 Use Entity#addPassenger(Entity) to add a passenger to the entity, do not modify the list directly as it is likely a copy.

Also, Eclipse is just your IDE. It does not affect how your code works.

 

Do you know if it is possible to add a Player to an entity as a passenger using this?
Sorry I am quite new to plug-ins but am trying to learn to do it myself

 

That is what the method exists for. You should test it.

It is fine. We all start somewhere.

 

Ok thanks! I'll test it out.