Multi Worlds - Multi Inventories?

Soo, I've got a basic plugin setup which allows users to teleport between the worlds -
pvp and build with the commandos /pvp and /build.
They spawn in a world called world ( Will set build as default world later ).
Althought, When i teleport between the world world and pvp now, i keep the inventory from world world, I want to reload the player.dat from pvp world(Not even generated) - Is there any way to do this?
(Im using the teleportTo(location); to teleport between worlds)

 

What I did was make a serializable inventory class and copy into it/out of it when I need to.

 

Aah smart! i didn't think of that

Will do! Thanks for your suggestion

 

Please note that you shouldn't add nulls or air because that crashes/hangs up the client.