What is this particle name? With world.playEffect(loc, Effect.NAME, 1); Anyone knows this? EDIT by Moderator: merged posts, please use the edit button instead of double posting.
Just try to find it yourself. There aren't so many different types that simply testing each effect would be infeasible.
Nojus This is the firework spark effect, this effect is not included in the bukkit .playEffect() method. The only way you could make the effect visible to a player, would be by sending a packet to the desired player. But with this library its fairly easy.